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    2011 RIVA Racing HydroDrags

    We apologize for any confusion regarding the rules for the 2011 Riva Racing Hydrodrags. The attached 2011 rule file is 99% identical to the rules used at the 2010 Hydrodrags.

    Important points to note:

    > Fuel rules remain the same as 2010. Hydrodrag fuel rules are identical to IJSBA closed course rules used for the past 15 years. The only exception to this is the allowance of NOS in Unlimited class.

    > Supercharger rules have been clarified in Superstock Class. Supercharged PWC must remain supercharged and can not be upgraded to turbo. Only Honda PWC can run turbochargers in Superstock. Superchargers can be modified or aftermarket in this class.

    > Technical inspection will be stepped up this year. This includes fuel testing to determine legality under IJSBA rules. Fuel samples can be submitted in advance to technical inspector for pre approval prior to race.

    >Finally, I will extend the entry period with no penalty until November 4th. Thanks for your patience during this transitional period. The Host Hotel/Comfort Suites is selling out quick so get your reservations early. The complete/updated Competition Guide will be available on prohydroxtour.com tomorrow 10/18 or by contacting me at [email protected]. Thanks, I hope this clears up the confusion. Mike


  2. #2
    COMPETITION GUIDE:
    2011 RIVA RACING
    HYDRODRAGS
    PREFACE: The 2011 Riva Racing HydroDrag Event is in its 5th year and is the only sanctioned personal watercraft drag race
    event of its kind. The event design, structure, and organization are continually being revised to offer safe, competitive, and
    fun competition. Please keep this in mind, the organizer’s intent is to provide the ultimate in safe, fun, and entertaining
    events and will make necessary changes to ensure this happens.
    THIS COMPETITION GUIDE IS A COMPLIMENT TO THE IJSBA PWC RACING RULE BOOK. PLEASE REVIEW
    THE IJSBA RULE BOOK FOR RULE CLARIFICATION AND DETAIL.
    Membership
    All aspects of competition outlined in the 2011 IJSBA rule book will be adhered to. EVERY PARTICIPANT IN THE HYDRODRAG
    NATIONALS IS ABSOLUTLEY REQUIRED TO BE A CURRENT COMPETITION MEMBER OF THE IJSBA IN GOOD STANDING.
    Sanctions
    All aspects of competition outlined in the 2011 IJSBA rule book will be adhered to with noted changes.
    Speed Alley: Top speed event where competitors compete individually on a long, marked, straight course to gain maximum
    speed while being measured by a radar device. Direction (to or from) Radar Gun location will be determined on‐site with
    respect to the weather conditions and venue layout.
    1. Speed Alley format – Each competitor will have two (2) opportunities (runs) to post their greatest top speed.
    2. The course will be marked with a starting point buoy ‐ with ample room to gain speed of roughly 800’‐1000’ ‐ and a
    target/finish area buoy, with ample room to decelerate.
    3. The competitor with the fastest recorded top speed in his class will be deemed the winner
    Boat Numbering System
    All aspects of competition outlined in the 2011 IJSBA rulebook will be adhered to with the following exceptions:
    Each rider will affix a number over 100 to both sides of their watercraft and must be a minimum of 7” tall. Following the
    number must be the letter signifying which class they are competing in that is a minimum of 5” tall. The following letters
    signify the classes.
     Hydro Unlimited: U
     Hydro Superstock: SS
     Hydro Pro Stock: P
     Hydro NA OPEN (Naturally Aspirated): NA
    This system is to help the officials, tech inspectors, starters, scoring, announcers, and spectators differentiate classes and
    riders. (Example: Pro Stock class PWC = “255‐P”)
    General Safety Rules – Specific safety rules for HydroDrags to follow in section 17.2
    10.2 SAFETY GEAR
    10.2.1 It is the responsibility of the participant to select a helmet and other safety equipment that will provide adequate
    protection during competition. The IJSBA does not endorse or guarantee specific products or manufacturers of
    safety equipment. Riders must rely on their own judgment in the selection of safety equipment to be used in
    competition for safety and durability.
    10.2.2 A rider, his/her mechanic, and any pit crew members, when operating registered equipment bearing IJSBA numbers
    or designation at any time while at a sanctioned event, must wear complete safety equipment including helmet and
    like jacket at all times while on the water.
    10.2.3 Helmets
    a. A properly fitting helmet that meets the current Department of Transportation (DOT) or current Snell standards is
    required to be worn at all times in competition.
    b. The only time a helmet is not required to be worn is during a Freestyle competition.
    c. It is highly recommended that any helmet involved in an accident be returned to the appropriate manufacturer
    for inspection and repair, if necessary.
    d. A full face helmet is mandatory. Without exception, no face shields/ guards of any kind will be allowed. Helmets
    with bolt‐on face shields are not allowed.
    e. No plastic, bicycle type, BMX, or similar designed headgear will be allowed.
    10.2.4 Life Jackets ‐
    a. A U.S. Coast Guard approved, type I or III, full jacket personal flotation device (life jacket) will be worn by all
    participants at all times while on the water.
    b. Every rider shall certify his/her floatation equipment to function properly when requested by an IJSBA official.
    c. It is recommended that all jackets have buckle‐type straps across closures.
    10.2.5 Eye protection in the form of goggles shall be highly recommended for all personal watercraft racing.
    10.2.6 Back protection and protective footwear are recommended for all riders at all IJSBA sanctioned events.
    10.2.7 The Race Director of an event shall have the authority to prohibit the use of any helmet, personal flotation device
    (life jacket), or other equipment which the Race Director may consider unsafe, insufficient protection or inadequate.
    10.2.8 No participant shall participate in an IJSBA sanctioned event with any type of splint, including but not limited to, a
    cast or brace applied to his/ her body, without written approval from a doctor and approval by the Race Director of
    the event.
    10.2.9 No rider shall be allowed to compete if it is determined by an official that the rider is under the influence of alcohol
    or drugs.
    10.2.10 It is the Race Director’s authority to deny participation of any rider that, if in the opinion of the Race Director, the
    rider may be hazard to the other participants, spectators, or themselves.
    10.2.11 A participant that exhibits dangerous or unsportsmanlike conduct at any time during a sanctioned event may be
    fined, penalized, or removed from an event.
    10.2.12 Dismounted riders, if uninjured, should wave hands above ahead as an “okay” signal.
    10.2.13 A rider that crosses the finish line, shall not interfere with any other rider/boat still in the race so as to affect the
    time of such boat at the finish or create a safety hazard.
    RULE 17 ‐ DRAG RACING
    17.1 GENERAL REGULATIONS
    17.1.1 Overview: Drag racing is an event where two competitors race side‐by‐side on a straight course of a set distance with the winner
    advancing to the next round through a bracket system. A double elimination format is the most common format. The standard
    length for a drag racing event is to use a 1/8 mile (660 feet) format; however, other length courses can be used based on the event
    and race site. For National events the standard 1/8 mile format should be used.
    17.2 GENERAL SAFETY EQUIPMENT ‐ DRAG RACING
    17.2.1 In addition to the IJSBA General Safety Rules outlined in Rule 10 on page 20 the following additional safety rules must be
    adhered to for all drag racing events. It is the responsibility of the participant to select the proper safety equipment that will
    provide adequate protection during competition. The IJSBA does not endorse or guarantee specific products or
    manufacturers of safety equipment. Riders must rely on their own judgment in the selection of safety equipment to be used
    in competition for safety and durability.
    17.2.2 Helmets ‐ Visors must be removed from all helmets.
    17.2.3 Life Jackets ‐
    a. A U.S. Coast Guard approved, type I or III, full jacket personal flotation device (life jacket) will be worn by all participants at
    all times while on the water.
    b. A Class XX Personal Flotation device with neck color can be worn by any and all participants.
    17.2.4 Protective Eyewear ‐ It is mandatory that eye protection in the form of DOT approved goggles/eyewear be worn at all times while
    practicing and/or racing.
    17.2.5 Gloves and Footwear ‐ It is mandatory that every rider wear gloves and closed toe‐footwear at all times while practicing and/or
    racing.
    17.2.6 Neoprene Riding Gear – It is mandatory that every rider wear, at minimum, neoprene shorts, at all times while practicing and/or
    racing. Shorty, spring, full neoprene wetsuits, and dry suits are also acceptable and recommended.
    17.2.7 Neck Protection ‐ It is highly recommended that neck protection be worn by the participants. Considering the fact that there is no
    safest neck protection device that will eliminate all risks, the participants are solely and ultimately responsible for selecting a suitable
    neck protection device that they feel will provide the proper safety protection for racing.
    17.3 GENERAL SAFETY RULES ‐ DRAG RACING
    17.3.1 Any person in the staging and starting line area will be required to wear safety eye protection.
    17.3.2 All watercraft are to be “cleaned/blown out” (clean fuel delivery system and exhaust system) in the designated warm up area only.
    The starting line area is off limits to these actions, and all riders must stay at least 100 feet behind the starting line while staging and
    remain at idle with‐in 200 feet of starting line/system area at all times.
    17.3.3 An operable tether (engine kill switch) must to be attached to the operator and the watercraft anytime the watercraft is running.
    17.3.4 The rider must have both feet completely down in/on the footwell, forward of the rear end of the seat for the entire duration of the
    race (no “Supermans” and no placing feet behind rear most point of the seat, in case of three‐seater/two‐piece seat PWC, rider can
    not place feet behind rear most point of forward half of two piece seat).
    17.3.5 Each PWC must have its seat securely attached at all time during tuning, practice, and competition. Seat base CAN NOT BE
    MODIFIED (no holes). Seat foam can be modified.
    17.3.6 A racer’s pit/race crew may only be in staging area during the times that the participant’s watercraft is racing.
    17.3.7 Any added weight must be secured safely in the watercraft where it will not shift or bounce during racing. A driver cannot wear
    weight belts or any weight adding device.
    17.3.8 The Race Director or any tech personal can disqualify any one that does not follow safety rules.
    17.4 RACE COURSE
    17.4.1 Course Length: Other than the maximum course length and minimum lane width, variations in course dimensions may be set by the
    promoter.
    17.4.2 Course Length National Events: The course length for all National HydroDrag events shall be 660 feet (1/8th mile). Official IJSBA Drag
    Racing records will be set only at approved IJSBA National events.
    17.4.3 Course Width: The minimum lane width is twenty five (25) feet. The individual lanes will be separated by a series of buoys to clearly
    mark the lanes or buoy line/string the length of the track.
    17.4.4 Finish Line: The finish line should be clearly marked with large buoys with two officials in line to determine winner. A video camera
    for “photo finish” calls is recommended.
    17.5 DRAG RACING RULES
    17.5.1 The following rules apply to all IJSBA sanctioned Personal Watercraft Racing (PWR) events. There may be some variations in the
    format from event to event. All such variations must be advertised for the information and must be convenience of the
    competitors.
    17.5.2 Single Elimination Racing Format
    1. In all classes, two watercraft will race per elimination heat, unless there is a bye.
    2. Heat qualifiers will advance until up to two finalists remain.
    3. Points will be awarded only to the driver of the watercraft.
    17.5.3 Double Elimination Racing Format
    1. The competitors will be aligned in a bracket system with random placements to start competition.
    2. A double elimination format will be utilized (with a minimum of six competitors). Winning rider of a race heat moves to next level of
    the bracket. Losing rider of a heat race (being his or her first heat loss) moves to losing bracket in attempt to continue.
    3. Following two heat losses competitor is eliminated from the competition in that class.
    4. The rider who reaches the final round and wins that race will be named the event champion in that class.
    5. Points will be awarded only to the driver of the watercraft.
    17.5.4 Order of Classes: The order of classes to be run will be determined by the Promoter or Race Director and properly publicized or
    posted for the convenience and information of the competitors.
    17.5.5 False Starts: If a competitor false starts, or jumps the gate the racer will be red flagged and the racer will be penalized or disqualified
    for that heat at the discretion of the Race Director. The racer will be disqualified from that particular race upon the second violation.
    17.5.6 Interference: If a competitor interferes with another competitor ‐ coming over, squeezing, drifting, etc ‐ causing spray or wakes that
    interfere with the other competitors’ ability to navigate the track safely, the racer at fault will be disqualified for that heat. The racer
    will be disqualified from that particular race upon the second violation.
    17.5.7 HydroDrag Starting System ‐ the Launch Pad – A new and innovative starting system will be utilized that is designed entertain the
    crowd with a visual spectacle of large shower of water upon the start of each race. The system will also provide an absolute equal
    starting opportunity for both competitors from a fixed, floating dock. A double bunk system will be utilized in which both craft will sit
    atop a double bunk starting gate in which competitors personal watercraft will be raised out of the water to the point only the crafts’
    jet pump intake is submerged, allowing for the pump to be loaded. Upon the start signal, the “gate” will be dropped, dropping the
    double bunk system roughly 6”, floating the personal watercraft, beginning the race. If a competitor false starts, or jumps the gate
    (driving off of the bunks) he or she will be red flagged and disqualified for that heat at the discretion of the Race Director. The racer
    will be disqualified from that particular race upon the second violation.
    ALL PERSONAL WATERCRAFT MUST BE DESIGNED FOR AND PREPARED TO SIT ON A DUAL BUNK SYSTEM MEASURING FIVE
    FEET IN LENGTH WITH INDIVIDUAL BUNK TUBING OF 2.5” (width 12” to best fit all hulls). HULL MATERIAL MUST BE DURABLE
    IN THIS AREA AND BE ABLE TO EASILY SLIDE ACROSS THIS BUNK SYSTEM.
    HydroDrag Starting Procedure – The HydroDrag will utilize a new HYDRODRAG LAUNCH PAD, a mechanical bunk drop system
    where two watercraft will start side‐by‐side with engine running atop a bunk system attached to a stationary, floating
    structure. The Launch Pad bunks will be on either side of the floating structure and will have a two parallel bunks constructed
    of 2.5” aluminum tubing running five feet in length and spaced 12” apart.
    Participants will approach the Launch Pad and with engine off position their PWC on to the bunks with the transom bond line
    lined up to be even with a marked line on the floating structure.
    Each participant’s bunk system will be raised out of the water with rider in position to the point where the intake is in the
    water and pump is loaded with water when running. Each rider can give as much throttle as possible WITH OUT sliding off of
    the bunk, in which case would result in a false start. (Only one false start is permitted per heat before participant is deemed
    looser of that heat or final)
    The starter will stand on floating platform with 30 second board. After each participant give the ready signal the 30 second
    board will be flipped and the gate starter can drop the Launch Pad bunks at anytime after to begin that race. Participants
    leave the Launch Pad and steer towards the finish line in their respective lane on the very outside of their respective lane.
    If a participant – intentionally or unintentionally – interferes with the competitor, that participant will be penalized by being
    forfeiting that particular heat. If this happens more than once with the same participant, that participant may be expelled for
    that day’s competition at the discretion of the race director of technical director.
    RULE 23 – GENERAL TECHNICAL RULES – ALL CLASSES
    READ ALL RULES PERTAINING TO YOUR CLASS – SOME BASIC RULES MAY BE AMENDED AS PER SPECIFIC CLASS
    MODIFICATION ALLOWANCES.
    23.1 OVERVIEW
    23.1.1 The following are the general requirements and technical rules that apply to all classes. The decision of the Technical Inspector
    and/or Race Director regarding modifications will be final. Any question regarding the legality of modifications should be directed to
    the IJSBA prior to use in competition.
    23.2 SOUND LEVEL – WAIVED FOR HYDRODRAG EVENTS
    23.3 FUEL
    23.3.1 Fuel must consist of unleaded gasoline only. For the purpose of this rulebook “gasoline” is defined as a mixture of hydrocarbons and
    oxygen bearing compounds with the following clarifications:
     Oxygen content must not increase the specific energy of the gasoline.
     Oxygen content must not exceed 3.7% by weight.
     Oxygen content must have been blended in by the refiner or the fuel manufacturer.
     Specific gravity must be between: .715 ‐ .770 at 60°F (15°C).
     The only allowable oxygenates are ethers and alcohols. Epoxides (example: propylene oxide) will not be considered ethers.
    Nitrogen bearing compounds are not allowed!
     Most commercially produced unleaded fuels and oils will meet these criteria. However some may contain additional additives
    that do not to meet these criteria. It a racer is unsure about his/her fuel the racer should have it tested by a Technical Inspector.
    23.3.2 Failure to not meet the IJSBA fuel criteria is punishable by a fine at the discretion of the Race Director not to exceed $100.
    23.4 TOW STRAP
    23.4.1 All watercraft must have a flexible tow loop or tow strap attached to the bow of the watercraft. The tow loop should be made of
    some type of flexible material (example: plastic coated braided steel, nylon strap, braided rope, etc.) so as not to create a hazard.
    Watercraft equipped with tow hooks that protrude beyond the plane of the hull must remove the tow hook. It is the rider’s
    responsibility to provide an adequate tow strap on the front of their watercraft. Racers failing to have a tow strap on their
    watercraft, or having a tow strap that breaks while in tow, may be fined and/or disqualified at the discretion of the Race Director.
    23.5 TETHER SWITCH/LANYARD
    23.5.1 In the event that a rider crashed or becomes dislodged from his/her watercraft, and the engine continues to run, and the tether
    (safety disconnect) switch fails to function, or is not properly fastened or attached to the rider or rider’s life vest, the rider will be
    disqualified from the heat that the infraction occurred. It is the rider’s responsibility to fasten the tether securely.
    23.5.2 Tether/Lanyard may not be wrapped around the handlebar or any other part of the watercraft during a race. The lanyard must be
    attached to the rider and be able to disconnect and stop the engine in the event the rider becomes separated from their watercraft.
    Riders wrapping the tether around the handlebar will be subject to penalty or fine at the discretion of the Race Director.
    23.5.3 Riders are allowed two (2) tethers/lanyards on their person while racing. One will be the primary, and the second will be a backup in
    the event that the primary lanyard should fail or get lost.
    23.6 GENERAL MAINTENANCE
    23.6.1 General Replacement Parts: Replacement of general maintenance parts (e.g., spark plugs, spark plug wires, spark plug caps, wiring,
    seals, water hoses, fuel lines, clamps and fasteners) shall not be restricted to original equipment. Aftermarket pump and driveshaft
    bearings are allowed.
    23.6.2 Starter: Replacement starter motor and bendix may be used.
    23.6.3 Oil Injection: The Oil Injection system may be disconnected or removed.
    23.6.4 Engine Mounts: Replacement engine mounts may be used.
    23.6.5 Repairing Stripped Threads: Stripped threads must be repaired to the original size.
    23.6.6 Fasteners: Fasteners (e.g., bolts, nuts and washers) may not be substituted with titanium pieces in Stock and Limited classes unless
    originally equipped. Fasteners may integrate locking mechanisms.
    23.6.7 Batteries: Replacement batteries are allowed but must fit into the original equipment battery box and must be securely fastened.
    Relocation is allowed in Limited and UNLIMITED Runabout classes only.
    23.6.8 Bilge Pump: The original bilge pump may be modified or disconnected. Aftermarket bilge draining systems that do not create a hazard are
    allowed.
    23.6.9 Crankcase Repairs: Repairs to cracked or punctured crankcases may be made provided only one damaged area affecting one cylinder
    bank has been repaired. No other modifications or repairs are allowed.
    23.7 COSMETIC CHANGES
    23.7.1 Hull: Padding and/or mat kits may be added and custom painting is allowed. The surface finish of any metal component outside the
    hull area above the bond flange may be painted, polished or plated.
    23.7.2 Hull Repairs: Hull and deck repairs may be made to a watercraft. Repairs must not alter the original configuration of the outside hull
    by more than 2.0 mm (0.08 in.). – UNLIMITED CLASS ALLOWS GREATER MODIFICATION VARIENCES
    23.7.3 Storage, Mirrors, Handles and Gauges: Drop‐in type storage buckets, bolt‐on type mirrors, handles and gauges may be modified,
    aftermarket, or removed provided a hazard is not created. No additional airflow may be created by the removal of mirrors in Stock
    classes.
    23.7.4 Engine: External modifications to the engine finish (e.g., painting, plating or polishing) are allowed for cosmetic purposes only.
    23.7.5 Bumpers/Siderails: Replacement bumpers and side rails may be used provided a hazard is not created.
    23.7.6 Spray Deflector: A soft, flexible type water spray deflector may be attached to the hull sides or to the bond flange of the watercraft
    provided a hazard is not created. No part of the spray deflector may extend beyond the perimeter of the original equipment bumper
    or side moldings as measured by a plumb line.
    23.8 SPONSONS
    23.8.1 General Rule: All watercraft may be equipped with a maximum of two sponsons. Sponsons may be aftermarket, modified,
    repositioned or removed. The overall length of each sponson shall not exceed 36.0 in (91.45 cm). Sponsons shall not protrude from the
    side of the hull by more than 3.94 inch (100 mm) when measured in a level horizontal plane. Sponsons must be made of one piece ‐
    two pieces that screw together to create one piece is allowed. All parts of the sponson must be made of safe material that would not
    injure another rider should the part fall off or be struck in the sponson area. Wood is not an acceptable material.
    23.8.2 Runabout Division Only: No part of the sponson shall extend downward below the point at which the side of the hull intersects the
    bottom surface of the hull by more than 2.5 inch (63.5mm). Aftermarket or modified sponsons must exceed .24 inch (6mm) in
    thickness. All leading edges must be radiused so as not to create a hazard. Sponsons may not be attached to the planing surfaces of
    the hull.
    23.9 STEERING SYSTEM
    23.9.1 Handlebar: Handlebar, grips, throttle, throttle cable may be modified or aftermarket. The handlebar cover may be modified or
    removed. The handlebar must be padded at the mounting bracket or, if it has a crossbar, the crossbar must be padded.
    23.9.2 Switches: Aftermarket switches and switch housings may be used.
    23.9.3 Steering Shaft and Components: Steering shaft, steering shaft holder and handlebar holder may be aftermarket. Quick‐turn steering
    modifications to alter steering ratio are allowed. Aftermarket steering cables will be allowed.
    23.9.4 O.P.A.S Block‐Offs: Off Power Assisted Steering (OPAS) block‐offs may be used on Sea‐Doo watercraft models equipped with this feature
    to fill in the void from the removal of this product for racing. Both the Riva Performance OPAS block‐offs and Pro Series block off have
    been approved for IJSBA racing in all classes. Other types of products by different aftermarket manufacturers will be approved on an
    individual basis.
    23.10 OTHER GENERAL RULES
    23.10.1 Intake Grate: The Intake grate may be modified or aftermarket. The Intake grate must be the full‐length type with at least one bar
    running parallel to the drive shaft. Grates may not extend more than 0.47 in. (12mm) below the flat plane of the pump intake area.
    All leading edges must have radiuses so as not to create a hazard.
    23.10.2 Ride Plate: The ride plate or pump cover plate may be modified or aftermarket. An extension may be added to the rear of the pump
    cover plate. The extension shall not exceed the width of the original equipment plate. Modified and aftermarket plates must not
    extend more than 3.94 in. (100.0mm) beyond the end of the original equipment plate for Ski and Sport Divisions or 7.00 in.
    (177.80mm) for the Runabout Division. The sides of the extension must be connected to the radiused portion of the pump plate so as
    not to create a hazard. Fins, rudders, skegs and other appendages that may create a hazard will not be allowed.
    23.10.3 Impeller: Impeller may be modified or aftermarket – except in box stock class. The original diameter must be maintained in Stock
    classes.
    23.10.4 Pump: Replacement wear rings that are within OEM internal diameter specifications may be used. Silicone adhesive sealant may be
    used in addition to original equipment seal to seal the pump inlet. If equipped, a visibility spout must be removed or plugged.
    23.10.5 Fuel Tank: Fuel tank must be OEM as supplied by the OEM manufacturer. An OEM fuel tank is the only tank that can be used to supply fuel to
    the engine.
    23.10.6 Catch Cans: Catch cans may be used for the purpose of preventing crankcase oil overflow and prevent oil from entering and the
    hull. Any other use of a catch can is not allowed.
    Launching and Beaching
    The launch ramp is small. It will be necessary to minimize your time on the shoreline and plan your launching and retrieving to
    accommodate all participants and to adhere to the time schedule. ATVs and beach carts are ideal.
    HYDRODRAG RACING CLASSES
    HYDRO PRO STOCK CLASS – The Hydro Stock class will adhere to all STOCK RUNABOUT CLASS
    technical rules outlined in the 2011 IJSBA rule book in regard to runabouts with no exceptions.
    RULE 24 ‐ TECHNICAL RULES – STOCK CLASSES
    24.1 OVERVIEW
    24.1.1 The intent of the Stock class rules is to establish a venue in which all riders and machines can compete at their own level with a
    relatively modest investment in equipment and maintenance costs. These rules are definitions and guidelines for allowable
    modifications or alterations. If a definition, modification or alteration is not cited, then it is to be construed that no modification,
    alteration or change can be made to the component unless it is specifically approved by the IJSBA Rules Committee. Original
    equipment parts may be updated to newer original equipment parts of the same model. The part must be a bolt‐on type part that
    requires no modifications to that part or any other parts except where rules allow substitutions or modifications. The rules and
    regulations below are in additional to all General Technical rules listed in Rule 23.
    24.4 SEATS
    24.4.1 Runabout Division Only: Original equipment seat base must be used. The seat cover and padding may be changed. Seat height may
    be changed provided the original seat base is used. The Seat Base CAN NOT be modified in anyway.
    24.5 HULL
    24.5.1 Trim Plate: Replacement trim plates or trim tabs may be used. Only replacement parts that offer handling characteristics the same as
    stock are allowed. The material shall not be restricted to original equipment as long as a hazard is not created (example: aluminum
    may be used in place of plastic). The Trim plate should be free of any sharp edges.
    24.5.3 Ballast Weight: Ballast weight may be added within the normally exposed areas of the hull to alter the handling of the watercraft
    provided a hazard is not created. Only weight consisting of constant mass (i.e., water or other fluid is not allowed) that does not
    require the modification or relocation of any parts will be allowed unless such modification or relocation is specified by other rules.
    24.6 ENGINE ‐ TWO‐STROKE
    24.6.1 Engines: Engines may be bored. Replacement piston assemblies may be used provided the original port timing, compression ratio, dome
    profile, skirt length and shape and type of material are not changed. Non‐conforming pistons (i.e.: skirt shape that is not an exact replica
    of the OEM piston) may be approved by the IJSBA but such approval must be obtained in writing. Replacement piston assemblies must
    weigh within ±25.00% of the original equipment. Chamfering of cylinder ports must not exceed 1.00mm (0.04 in.) at a 30 degree
    maximum angle. No internal modifications of any kind, including grinding, surfacing, polishing, machining, shot peening, etc., will be
    allowed on any engine components. Engine girdle systems like one made by Pro‐Tec Performance are allowed.
    24.6.2 Engine Displacement: Engine displacement must not exceed class designation. Exception – Maximum allowable displacement over
    class designation may not exceed 803cc for the 800cc Stock Ski classes.
    24.6.3 Rave Valves and Caps: Rave Valves may be trimmed to allow for oversized pistons. Rave Valve Caps may be drilled so that an inspection
    can be made to insure values are functioning properly. Modifying the Rave Valve and Caps for any other reason is not allowed.
    24.6.4 Gaskets: Replacement gaskets may be used but must be of the same type (e.g., sheet, o‐ring, etc.) as their OEM counterparts.
    Replacement base gaskets must not be thicker than 0.8 mm (0.032 in). Replacement head gaskets shall be allowed a tolerance of up
    to 0.005 mm (0.002 in) thinner than the original OEM head gasket and up to 1.5mm (0.06 in) thicker than the original OEM head
    gasket. All other gaskets shall be allowed a tolerance of plus or minus 20%. Modifications to the head and exhaust manifold to head
    pipe gaskets are allowed. Additional holes may be added or subtracted. All other gaskets must have the same OEM pattern. All
    gaskets must meet the thickness and tolerances as outlined in the rule.
    24.6.5 Reeds: Reed petals may be modified or aftermarket provided the original equipment reed stop and cage assembly are used.
    24.6.6 Crankshaft: Crankshaft may be rebuilt using replacement counterweights, crank pins, bearings and connecting rods.
    Counterweights, crank pins and connecting rods made of non‐ferrous metals are not allowed. Stroke and rod length may not be
    changed. Counterweights on non‐rebuildable style crankshafts may be machined to accept a press‐through crank pin. Replacement
    bearings must maintain their original type and dimensions. Replacement counterweights must resemble the original part (e.g., holes
    and/or pockets not existing on the original part may not be on the replacement part). The total weight of the crankshaft assembly
    must be within ±5 % of the original equipment weight. Crankpins may be welded and/or keyed to the counterweights.
    24.6.7 Cooling System: The cooling system may be modified or aftermarket and aftermarket cooling lines and water bypass systems may be
    used. Additional cooling supply lines and fittings may be added to the pump. Fittings may not be added to the cylinder head, cylinder,
    or crankcase. Bypass fittings may be modified, aftermarket and/or relocated but must be directed downward and/or rearward so as
    not to create a hazard for other riders. Any valves used within the entire cooling system must be of the fixed type or automatic (e.g.,
    thermostats, pressure regulators, etc.). Cooling system flush kits are allowed.
    24.6.8 Exhaust: The exhaust system must remain stock as supplied by the manufacturer. An insert may be added to reduce the inside
    diameter of the stinger portion of the exhaust system. Electronically controlled water injections systems are not allowed unless
    originally equipped. Manually controlled devices (by any means of actuation) that alter the flow of cooling water during operation are
    not allowed. The original OEM water inlet fitting may be drilled to accept a maximum size of ¼ inch NPT by ½ inch barbed fitting.
    Exhaust system stinger end may be drilled and tapped for injection of water only, no other modifications to the exhaust system are
    allowed.
    24.6.9 Waterboxes: Damaged water boxes may be repaired, including by means of welding. No changes to the interior of the water box (i.e.
    baffles) are allowed whether these changes are the result of damage or repair. Repairs may cause no performance gains. Sea‐Doo XP
    DI water box may be used as a replacement for XP Limited and Sea‐Doo XP (951 cc models).
    24.6.10 Ventilation: Engine compartment ventilation tubes may be modified, aftermarket, or removed. Inlet and outlet openings may not
    be enlarged (i.e., when the tube is removed, the opening may not be larger than stock). Vents may be shielded or plugged. No other
    modifications to the hood will be allowed.
    24.6.11 Driveline Components: No internal modifications of any kind, including grinding, surfacing, polishing, machining, shot peening, etc.,
    will be allowed on any driveline components (e.g., pump stator, reduction nozzle, etc.).
    24.6.151) Ignition: The Ignition must remain OEM and can not be modified or altered in any way. RPM limiter function may not bypassed or
    eliminated. CDI unit must be OEM and can not be modified or aftermarket. Ignition timing may be changed. Modifications to the
    original equipment ignition pickup mount are not allowed. Original equipment charging system must be used.
    24.6.162) The head and base gaskets must be OEM. Replacement gaskets that are the same thickness as OEM will be allowed.
    24.6.173) Bore must be stock, however, an overbore allowance of 1mm over stock will be allowed.
    24.7 ENGINE ‐ FOUR‐STROKE
    24.7.1 Cylinder Head: Cylinder head combustion chambers may be cleaned by bead blasting with valves seated in place. Intake and exhaust
    ports may not be bead blasted or cleaned with abrasive material such as steel wool or Scotch‐Brite®. Repairs to the cylinder head
    affecting one cylinder bank are allowed.
    24.7.2 Crankshaft: Crankshaft must remain stock. Replacement bearings or bearing shells are allowed, providing they maintain their original
    type and dimensions.
    24.7.3 Camshafts: Camshaft(s) must remain stock. Replacement bearings or bearing shells are allowed, providing that they maintain their
    original type and dimensions.
    24.7.4 Intake and Exhaust Valves: Intake and exhaust valves may be shimmed with OEM or aftermarket shims.
    24.7.5 Runabouts Only ‐ Valve Spring Retainers: Aftermarket Valve Spring Retainers are allowed.
    24.7.6 Cooling System: The cooling system may be modified or aftermarket. Aftermarket cooling lines and water bypass systems may be
    used. Additional cooling supply lines and fittings may be added to the pump. Fittings may not be added to the cylinder head,
    cylinder, or crankcase. Bypass fittings may be modified, aftermarket and/or relocated but must be directed downward and/or
    rearward so as not to create a hazard for other riders. Any valves used within the entire cooling system must be of the fixed type or
    automatic (e.g., thermostats, pressure regulators, etc.). Electronically controlled water injections systems are not allowed unless
    originally equipped. Manually controlled devices (by any means of actuation) that alter the flow of cooling water during operation are
    not allowed. Cooling system flush kits are allowed.
    24.7.7 Valve Cover: Valve cover may be modified or replaced for cosmetic purposes and/or weight reduction only.
    24.7.8 Stripped Threads: Stripped threads must be repaired to the original size.
    24.7.9 Fuel System: Fuel injectors and fuel pump must remain stock. Fuel pressure regulator may be modified to change fuel pressure.
    24.7.10 Replacement Fasteners ‐ Fasteners (e.g., bolts, nuts and washers) may not be substituted with titanium pieces unless originally
    equipped. Fasteners may integrate locking mechanisms.
    24.7.11 Actuator Arm ‐ Hydrospace S4 owners may use an aftermarket waste gate actuating arm.
    24.7.12 Engine Displacement: Four‐stroke Ski watercraft are limited to 1600cc as furnished by the manufacturer. If a Runabout, as furnished
    by the manufacturer, exceeds 1600cc then the maximum displacement shall be the OEM displacement plus 1mm overbore on all
    cylinders. The maximum displacement that may be achieved by any Runabout class watercraft is 2000cc.
    24.8 IGNITION AND ELECTRONICS ‐ TWO‐STROKE
    24.8.1 Electronic Control Unit (ECU) ‐ The original electronic control unit may be modified or aftermarket so long as it does not offer any
    additional inputs or outputs than the original unit, and it must connect with the original connections. No additional sensors may be
    added (e.g., exhaust gas temperature, detonation sensors, etc.). Engine temperature sensors may be disabled. ECU may not be
    programmed to alter the original function of the OEM controls and or switches.
    24.8.2 Ignition: Ignition timing may be altered by slotting ignition trigger mounting plate. An adapter plate may be used for the sole purpose
    of relocating the ignition trigger. Woodruff key may be modified or removed.
    24.9 IGNITION AND ELECTRONICS ‐ FOUR‐STROKE
    24.9.1 Runabout Only ‐ Electronic Control Unit (ECU): The original electronic control unit may be modified or aftermarket. Any ECU that
    requires additional inputs or outputs, additional sensors to be added (e.g., exhaust gas temperature, detonation sensors, etc.), etc.
    must be approved by the IJSBA in writing before being allowed to be used. Engine temperature sensors may be disabled. The ECU
    may not be programmed to alter the original function of the OEM controls and or switches.
    24.9.2 Ignition: Ignition timing may be altered by slotting ignition trigger mounting plate. An adapter plate may be used for the sole purpose
    of relocating the ignition trigger.
    24.10 AIR/FUEL DELIVERY ‐ TWO‐STROKE
    24.10.1 Flame Arresters: Aftermarket flame arresters that meet USCG, UL‐1 111 or SAE J‐1928 Marine standards may be used. Flame arrestor
    mesh can not be removed or modified. Pre‐filter flame arrestor covers are allowed.
    24.10.2 Carburetor: Carburetor jets (replaceable type), needle valves, and needle valve springs may be changed. The choke may be removed
    provided additional air intake for the engine is not created. An aftermarket primer system may be installed. No drilling, tapping or
    boring any part of the carburetor. Throttle plate angles or modifications to the throttle plate are not allowed. No other carburetor
    modifications are allowed.
    24.10.3 Fuel System: The entire fuel system is a closed system. The watercraft must not vent or spill fuel at any attitude with or without the
    engine running. The original equipment fuel tank, fuel filter, fuel pickup, fuel filler, fuel tap assembly and relief valve must be used
    and cannot be modified. Fuel petcock may be bypassed. Additional fuel filters may be used. Fuel tank filler cap may be modified or
    aftermarket provided a hazard is not created.
    24.11 AIR/FUEL DELIVERY ‐ FOUR‐STROKE
    24.11.1 Flame Arrestor: Flame arrestors that meet USCG, UL‐1 111 or SAE J‐1928 Marine backfire flame arrester test standards must be
    installed. Flame arrestor mesh can not be removed or modified. Pre‐filter flame arrestor covers are allowed.
    24.11.2 Electronic Fuel‐Injection Systems: Flame arresters that meet USCG, UL‐1 111 or SAE J‐1928 Marine backfire flame arrester test
    standards must be installed. Flame arrestor mesh can not be removed or modified. Pre‐filter flame arrestor covers are allowed. If
    not equipped with an airflow sensor, the ducting between the flame arrestor and throttle body may be modified or aftermarket. If
    originally equipped with an airflow sensor, the ducting may be modified or aftermarket between the flame arrestor and airflow
    sensor. Modifications to the airflow downstream of the airflow sensor are not allowed. No modifications to the turbocharger and
    supercharger system are allowed.
    24.11.3 Throttle Body: Throttle body housing must remain as supplied by the OEM manufacturer. No modifications are allowed, including
    the changing of the number of throttle plates and or angles.
    24.11.4 Carburetor: Carburetor jets (replaceable type), needle valves and needle valve springs may be changed. Choke may be removed
    provided additional air intake for the engine is not created. Aftermarket primer system may be installed. No other carburetor
    modifications will be allowed. The R&D Powershot fuel injection tuning module and fuel controller may be used.
    24.12 TURBOCHARGER/SUPERCHARGER
    24.12.1 Turbocharger/Supercharger: Modifications to any part of the turbocharger or supercharger system (i.e., housing, turbines, rotors,
    sensors, ducting, spacing, etc.) are not allowed. On Sea‐Doo supercharged models the OEM ceramic clutch washer may be
    aftermarket.
    24.13 STOCK CLASS SUMMARY
    The items listed below need not be OEM for participation in the Stock classes. See specific class rules for more details and
    specifications.
    1) Starter Motor
    2) Engine Gaskets
    3) Flywheel Key
    4) Engine Mounts
    5) Fuel Filter, Fuel Hose
    6) Control Cables and Housings
    7) Carburetor Pivot Arm
    Throttle Lever, Handlebars, Grips
    9) Handlepole, Handlepole Bushings, Spring or Spring Helper
    10) Coupler Dampers and Coupler Shroud
    11) Pump Bearings
    12) Engine and Pump Seals
    13) Battery
    14) Mats, Decals, Hood Seal
    15) Bond Rails
    16) Flame Arrestors
    17) Impeller
    1 Ride plate and Intake grate
    19) Pistons
    24.14 COMMON REASONS FOR DISQUALIFICATION – STOCK CLASS
    The following is a list of common reasons for disqualification in the Stock class; this listing is not necessary a complete list of all
    reasons that a rider/PWC may be disqualified, but include the most common reasons. .
    1) Missing tow strap on watercraft.
    2) Cylinder ports have been modified beyond tolerable limits listed in the rulebook.
    3) Carburetors have been modified past factory specs.
    4) Flame arrestor mesh has been removed or modified.
    5) Cylinder head has been milled down.
    6) Cylinder has been decked or milled beyond factory specs.
    7) Aftermarket or lightened flywheel.
    Exhaust system or waterbox modifications.
    9) Pump modifications or nozzle boring in Runabout classes.
    10) No rubber nose bumper.
    11) Additional hull or hood ventilation for increased airflow to engine.
    12) Engine gaskets beyond tolerable limits as specified in rulebook.
    13) Aftermarket or modified supercharger impeller.
    14) Sponson length/depth exceeds specifications in rulebook.
    15) Intake grate depth has been exceeded beyond rulebook specs.
    16) Ride plate length exceeds rulebook specs.
    17) Crankcases have been decked / modified.
    1 Pump stuffer/modifications to pump shoe or inlet duct.
    19) Improper backdating of pipe/exhaust system.
    HYDRO SUPER STOCK CLASS ‐ The Hydro SUPERSTOCK class will adhere to all IJSBA OPEN CLASS
    technical rules outlined in the 2011 IJSBA rule book in regard to runabouts with THE FOLLOWING EXCEPTIONS…
    1) Hull & deck must be stock.
    2) Supercharged watercraft must stay supercharged (No turbos except Honda). Superchargers and
    housings may be modified or aftermarket.
    RULE 25 ‐ TECHNICAL RULES – OPEN CLASSES
    25.1 OVERVIEW
    25.1.1 Open Classes are intended to promote the highest level of modification, handling, control and speed in the sport of personal
    watercraft racing. Watercraft competing in this class must conform to the specifications which follow. All watercraft must remain strictly
    stock except where rules allow or require substitutions or modifications. Changes or modifications not listed here are not permitted.
    Original equipment parts may be updated or backdated to original equipment parts of the same model. The part must be a bolt‐on type
    part requiring no modifications to that part or any other parts except where rules allow substitutions or modifications. The rules and
    regulations below are in additional to all General Technical rules listed in Rule 23.
    25.2 SEATS
    25.2.1 Seats ‐Sport and Runabout Division Only: Seat assembly may be modified or aftermarket. The seat cover and padding may be
    changed. Seat height may be changed.
    25.3 HULL
    25.3.1 Hull and Deck Repairs: Hull and deck repairs may be made. However, these repairs must not alter the standard configuration by
    more than 2.00mm (0.08 in.). Hull, bulkhead and deck may be internally reinforced. Fasteners may be installed through the hull, bulkhead
    and deck for the purposes of securing components to interior surfaces, provided a hazard is not created. Other than for the use of
    fasteners, the bulkhead may not be modified. Glue squeeze‐out may be removed from the hull.
    25.3.2 Trim Tabs: Aftermarket trim tabs, either fixed, automatic and/or rider controlled, may be used. Original equipment trim plates that
    are detachable from the hull may be removed or replaced when installing aftermarket trim tabs. Trim tabs cannot exceed the width of the
    planing surface or extend rearward more than 100mm (3.94 in.) beyond the end of the original planing surface.
    25.3.3 Hull Extensions: All hull extensions mounted on the hull’s transom will be considered as a trim tab. All edges must be radiused so as
    not to create a hazard. Fins, skegs, rudders and other appendages that may create a hazard are not allowed.
    25.4 AFTERMARKET OR MODIFIED HULLS
    25.4.3 Deck: Original equipment deck must be used. Deck repairs may be made, provided they do not alter the standard
    configuration by more than 2.00mm (0.08 in.). The deck’s bond flange may not be modified. Deck may be internally reinforced.
    25.4.4 Weight Requirements: At all times, the watercraft must weigh no less than 10 percent under the watercraft’s original dry weight as
    determined by the IJSBA Technical Committee, providing the following:
    • Includes fuel and oil.
    • Includes the water in the waterbox, so long as the waterbox is not deemed to be out of ordinary in volume.
    • Includes the battery.
    • All reasonable amount of water must be removed from all compartments.
    • For a list of published weights and the method of computing the
    25.4.5 Fasteners: Fasteners may be installed through the hull and deck for the purpose of securing components to interior surfaces,
    provided that a hazard is not created.
    25.4.6 Rejoining Hull Components: If upper and lower components of the original equipment bond flange are separated and rejoined, they
    must be rejoined by the same method as original equipment (i.e., bonded together with a high‐strength adhesive).
    25.4.7 Engine Compartment Foam: Engine compartment foam may be removed, modified or aftermarket. Only floatation foam within the
    engine compartment may be removed. Only foam that can be removed without modification to any other part or parts, except where rules
    allow the parts to be modified, is allowed. Parts may not be relocated based on the removal of the foam. The hull’s inner liner or deck may
    not be cut or modified to remove foam. Removal of foam between layers of the hull and/or deck is not allowed.
    25.4.9 Hood Covers/Gauges/Mirrors and Handles: Storage covers, hatches, instrument cowlings and engine covers may be
    modified or aftermarket provided a hazard is not created and the OEM appearance is maintained. Additional engine compartment
    ventilation is allowed. Original equipment vents may be shielded or plugged. Handles, dropin type storage buckets and bolt‐on type
    mirrors may be modified, aftermarket or removed provided a hazard is not created.
    25.4.10 Ballast Weight: Ballast weight may be added prior to competition to meet the required weight limit. Ballast weight may be added
    within the normally exposed areas of the hull to alter the handling of the watercraft provided a hazard is not created. Only weight
    consisting of constant mass (i.e., water or other fluid is not allowed) that does not require the modification or relocation of any parts will be
    allowed unless such modification or relocation is specified by other rules.
    25.5 ENGINE ‐ TWO‐STROKE
    25.5.1 Engines: Engines may be bored. Aftermarket piston assemblies are allowed. The number, type, and placement of rings on piston
    may be changed.
    25.5.2 Engine Displacement: Engine displacement must not exceed class designation. Exception – Maximum allowable cc over class
    designation may not exceed 850cc for all Open Ski classes.
    25.5.3 Crankcase: Original equipment crankcase must be used. Internal modifications to the fuel, oil and/or water‐exposed surfaces
    are allowed. Filler material may be added to hollow pockets in the base gasket areas. Base gasket and intake surfaces may be
    machined. Additional carburetor pulse line fittings may be installed. Bearing and seal surfaces may not be modified. Crankcase drain
    system may be removed and plugged. Repairs to cracked or punctured crankcases may be made provided only one damaged area
    affecting one cylinder bank has been repaired. No other external modifications or external repairs are allowed.
    25.5.4 Crankshaft: Crankshaft assembly may be modified or aftermarket.
    Stroke and rod length may be modified. 74 2009 IJSBA Personal Watercraft Racing
    25.5.5 Engine Balancing Assemblies: Engine balancing assemblies may be modified, aftermarket, or removed.
    25.5.6 Cylinders: Cylinders may be interchanged between watercraft of the same manufacturer. Any modifications to the cylinder or
    crankcase must be approved, in writing, by the IJSBA. Base gasket, head gasket and exhaust manifold gasket surfaces may be machined.
    Port heights, widths and shapes may be changed. Ports may be added or deleted from cylinder. Cylinders may be machined to accept aftermarket
    cylinder liners. Epoxy‐type filler material may be added to hollow pockets in the base gasket areas and in the port area. Repairs to
    cracked or damaged cylinders may be made provided only one damaged area affecting one cylinder bank has been repaired. Cylinders may
    be machined to accept girdle‐type cylinder heads. Water cooling fittings may be added to cylinder. Exhaust power valve components and
    means of actuation may be modified or aftermarket.
    25.5.7 Cylinder Head: Cylinder head may be modified or aftermarket.
    25.5.8 Gaskets: Engine gaskets may be modified or aftermarket.
    25.5.9 Exhaust System: Exhaust system (i.e., manifold, head pipe, expansion chamber, waterbox, muffler(s), etc.) may be modified or
    aftermarket. Through‐hull exhaust may be modified or aftermarket, provided that a hazard is not created. The exit location of the exhaust
    gases may be relocated to the transom below the bond flange. No tuned portion of the exhaust system shall protrude outside the hull.
    25.5.10 Cooling System: Cooling system may be modified or aftermarket. Aftermarket cooling lines and water bypass systems may be used.
    Bypass fittings may be modified, aftermarket and/or relocated but must be directed downward and/or rearward so as not to create a
    hazard for other riders. Any valves used within the entire cooling system must be of the fixed type or automatic (e.g., thermostats, pressure
    regulators, solenoids, etc.). Manually controlled devices (by any means of actuation) that alter the flow of cooling water during operation
    are not allowed. Cooling system flush kits are allowed.
    25.6 ENGINE ‐ FOUR‐STROKE
    26.6.1 Engine Block: Original engine block must be used. Internal modifications to the oil and/or water‐exposed surfaces will be allowed.
    The head gasket surface of the cylinder block may be machined.
    25.6.2 Cylinder Head: Cylinder head may be modified or aftermarket. Intake and exhaust runners may be modified. Material may be added
    to the runners. Intake and exhaust ports may be modified. Port diameters and shapes may be changed. Combustion chambers may be
    modified. Material may be added to the combustion chamber. The original number of intake and exhaust valves must be the same as
    original. Repairs to the cylinder head affecting one cylinder bank are allowed. The head gasket surface may be machined.
    25.6.3 Valvetrain and Components: Aftermarket valvetrain components are allowed provided the original method of activation is
    maintained (e.g., if originally activated by a camshaft, they may not convert to solenoid activation). Valves may be shimmed with OEM or
    aftermarket shims. Valve springs may be modified or aftermarket. Camshaft(s) may be aftermarket. The number of camshafts must be the
    same as original. Original bearing type and dimensions must be used. Cam timing may be changed. Cam gears, tensioners, chain or belt may
    be modified or aftermarket.
    25.6.4 Engine: Engines may be bored. Aftermarket piston assemblies are allowed. Engine displacement must not exceed class designation
    (e.g.,1300cc in Pro‐Am Run Open, 2000cc for 4‐Stroke Open, etc.).
    25.6.5 Engine Displacement Open Ski Classes: For all Open Ski classes the displacement must not exceed 800cc for four‐stroke watercraft.
    25.6.6 Crankshaft: Crankshaft may be modified or aftermarket. Stroke must remain the same as original. Total weight of the crankshaft
    must be within +/‐5.00% of the original equipment weight. Replacement bearings or bearing shells are allowed provided that they maintain
    their original type and dimensions.
    25.6.7 Engine Balancing Assemblies: Engine balancing assemblies may be modified, aftermarket or removed.
    25.6.8 Rods: Aftermarket connecting rods made of ferrous materials are allowed. Rod length may be changed.
    25.6.9 Exhaust System: Exhaust system (i.e., manifold, connecting pipes, hoses, muffler(s), etc.) may be modified or aftermarket. Throughhull
    exhaust may be modified or aftermarket, provided that a hazard is not created. No tuned portion of the exhaust system may protrude
    outside of the hull. Exit location of the exhaust gases may be relocated to the transom below the bond flange of the boat.
    25.6.10 Cooling System: The cooling system may be modified or aftermarket and additional cooling lines may be added. Aftermarket water
    bypass systems may be used. Cooling system bypass fittings may be modified or aftermarket and/or relocated, however, if relocated, the
    fittings must be directed downward and/or rearward so as not to create a hazard for other riders. Any valves that are used within the
    entire cooling system must be of the fixed type or automatic (e.g., thermostats, pressure regulators, solenoids, etc.). Manually controlled
    devices (by means of actuation) that alter the flow of cooling water during operation are not allowed. Original cooling system thermostat
    may be removed, modified or aftermarket. Cooling system flush kits are allowed.
    25.6.11 Oil Reservoir and Oil Pump: Baffles in the oil reservoir may be modified. The addition of baffles in oil reservoir is allowed. Oil pump
    may be modified or aftermarket. Additional cooling fittings may be installed. Visibility spout must be removed or plugged. Silicone adhesive
    sealant may be used in addition to original equipment seal to seal pump inlet.
    25.6.12 Valve Cover: The valve cover may be replaced for cosmetic purposes
    and/or weight reduction only.
    25.7 AIR/FUEL DELIVERY ‐ TWO‐STROKE
    25.7.1 Carburetors: Carburetor(s) may be modified or aftermarket provided
    they do not vent or spill fuel at any attitude with or without the engine
    running. The number of venturis cannot exceed the number of cylinders.
    No slide‐type carburetors are allowed. Aftermarket primer may be used.
    Intake manifold assembly may be modified or aftermarket. Aftermarket
    crankcase pressure operated fuel pumps may be used.
    25.7.2 Fuel System: The entire fuel system is a closed system. The watercraft
    must not vent or spill fuel at any attitude with or without the engine
    running. Original equipment fuel tank, fuel filler, and relief valve must
    be used and cannot be modified. The fuel pickup, fuel filter, and fuel
    petcock may be removed and/or aftermarket. Additional fuel filters may
    be used and fuel cell foam may be added to the original equipment fuel
    tank. Fuel tank filler cap may be modified or aftermarket.
    25.7.3 Vapor Separators: Modified or aftermarket vapor/air separators must
    not exceed 2 in. x 6 in., and must have a return line to the fuel tank open
    at all times. Additional fuel reservoirs may not be used.
    25.7.4 Fuel Pumps: Aftermarket or modified electric fuel pumps, not exceeding
    4psi, may be used. When the engine is shut off or stops, the fuel pump
    must automatically stop. No manually operated on/off‐type fuel pumps
    are allowed.
    25.7.5 Fuel Injection Systems: Aftermarket fuel injection systems and
    components are allowed provided the following regulations are adhered
    to: High‐pressure fuel hose meeting SAE J30R9 must be used; A.N.
    threaded‐type fittings or equivalent and non‐removable, crimped‐type
    clamps must be used on the high‐pressure portion of the system (i.e.,
    hose clamps, zip ties, etc. are not acceptable); only metal‐type fuel filters
    may be used on the high‐pressure portion of the system; all other in‐line
    filters must be installed on the low‐pressure portion of the system.
    25.7.6 Flame Arresters: Flame arrester(s) which satisfy United States Coast
    Guard, SAE‐J1928 Marine or UL‐1 111 Marine backfire flame arrester
    test standards must be installed. Aftermarket flame arresters satisfying
    one of these test standards are allowed. Intake silencer may be removed.
    Flame arrestor mesh can not be removed or modified. Pre‐filter flame
    arrestor covers are allowed.
    25.7.7 Reed and Rotary Valves: Reed valve assemblies may be modified or
    aftermarket. Rotary valve may be modified or aftermarket.
    25.8 AIR/FUEL DELIVERY ‐ FOUR‐STROKE
    25.8.1 Fuel System: The original fuel injectors may be modified to increase
    fuel‐flow rate. Aftermarket fuel injectors that increase fuel flow are allowed
    provided they must not increase airflow into the combustion chamber.
    Fuel rail and fuel regulator may be modified or aftermarket. Additional fuel
    injectors may be added. Aftermarket fuel pumps are allowed provided that
    when the engine is shut off or stops, the fuel pump must automatically
    stop. No manually operated on/off fuel pumps are allowed. High‐pressure
    fuel hose meeting SAE J30R9 must be used; only metal‐type fuel filters
    may be used on the high‐pressure portion of the system; all other in‐line
    filters must be installed on the low‐pressure portion of the system.
    25.8.2 Flame Arresters: Flame arresters that meet USCG, UL‐1 111 or SAE
    J‐1928 Marine standards must be used. Airflow sensor may be modified,
    aftermarket or removed. Ducting between the flame arrestor and throttle
    body may be modified or aftermarket. Flame arrestor mesh can not be
    removed or modified. Pre‐filter flame arrestor covers are allowed.
    25.8.3 Throttle Body: Throttle body may be modified or aftermarket. The
    number of butterflies may be increased but may not exceed the number
    of cylinders.
    25.8.4 Intake Manifold: Intake manifold assembly may be modified or
    aftermarket.
    25.8.5 Carburetor: Carburetor(s) may be modified or aftermarket provided
    they do not vent or spill fuel at any attitude with or without the engine
    running. Carburetors may be used in addition to or in place of the fuel
    injection system. The number of venturis cannot exceed the number of
    cylinders. No slide‐type carburetors. Aftermarket primer may be used.
    Intake manifold assembly may be modified or aftermarket. Aftermarket
    air‐pulse‐pressure operated fuel pumps may be used.
    25.9 IGNITION AND ELECTRONICS ‐ TWO AND FOUR‐STROKE
    25.9.1 Electrical and Charging System: Ignition system, electrical box,
    flywheel and flywheel cover may be modified or aftermarket. Battery
    charging circuit may be disabled and/or removed.
    25.9.2 Relocation of Electrical Components: Relocation of electrical
    components (e.g., box or housing) is allowed in order to fit an aftermarket
    exhaust system (only the strict minimum needed). Modification will be
    subject to the Technical Directors’ approval.
    25.9.3 Relocation of Battery Box: Relocation of the battery box is allowed
    in order to fit an aftermarket exhaust system provided the relocated
    battery box and battery are securely fastened.
    25.9.4 Temperature Sensor: Engine temperature sensor assembly may be
    disconnected and/or removed.
    25.10 TURBOCHARGER/SUPERCHARGER
    25.10.1 Supercharged watercraft must stay supercharged (No turbos except Honda). Superchargers and housings may be modified or
    aftermarket.
    25.10.2 Intercooler: Intercooler may be modified or aftermarket.
    25.10.3 Boost Valve: Boost pressure‐relief valve may be modified or aftermarket
    25.10.4 Boost Sensor: Boost sensor may be modified or aftermarket.
    25.11 DRIVELINE AND PUMP
    25.11.1 Pump: Impeller, impeller housing, stator vane assembly, pump mounting
    plate and/or pump shoe may be modified or aftermarket. Additional
    coolingfittings may be installed. Visibility spout must be removed or
    plugged. Silicone adhesive sealant may be used in addition to original
    equipment seal to seal pump inlet.
    25.11.2 Pump Nozzle: Pump nozzle and directional nozzle
    may be modified or
    aftermarket. Overall length of the complete pump and nozzle assembly
    may be no more than 50.00mm (1.97 in.) longer than original
    equipment.
    25.11.3 Trim System: Aftermarket nozzle trim systems may be used.
    25.11.4 Driveline & Components: Couplers, bearing housing and driveshaft
    may be modified or aftermarket provided they maintain a 1:1 drive ratio
    between the engine and the pump.
    25.11.2 Pump Nozzle: Pump nozzle and directional nozzle may be modified or aftermarket. Overall length of the complete pump and nozzle
    assembly may be no more than 50.00mm (1.97 in.) longer than original equipment.
    25.11.3 Trim System: Aftermarket nozzle trim systems may be used.
    25.11.4 Driveline & Components: Couplers, bearing housing and driveshaft may be modified or
    aftermarket provided they maintain a 1:1 drive ratio between the engine and the pump.
    25.12 OPEN CLASS SUMMARY
    25.12.1 The following items need not be OEM for participation in the Open Class:
    1) Engine Gaskets
    2) Flywheel Key
    3) Engine Mounts
    4) Ignition or ECU
    5) Fuel Filter, Fuel Hose
    6) Control Cables and Housings
    7) Carburetor Pivot Arm
    Throttle Lever, Handlebars, Grips
    9) Handlepole mounting bracket, bushings, spring or spring helper
    10) Coupler Dampers
    11) Coupler Shroud
    12) Pump Bearings
    13) Engine and Pump Seals
    14) Battery
    15) Mats, Decals, Hood Seal
    16) Bond Rails
    17) Flame Arrestors
    1 Impeller
    19) Rideplate
    20) Intake Grate
    21) Cylinder Head
    22) Exhaust System
    23) Carburetors
    24) Seats on Runabout/Sport models
    25) Bilge systems
    26) Engine compartment foam
    27) Pistons
    2 Cooling System lines and fittings
    29) Reed valve assemblies
    30) Pump assembly
    25.13 COMMON REASONS FOR DISQUALIFICATION – OPEN
    25.13.1 The following is a list of common reasons for disqualification in the Open class; this listing is not necessary a complete one.
    1) Missing tow strap
    2) Upper deck modifications.
    3) Illegal hull modifications (inlet duct area main problem).
    4) Bulk head modifications.
    5) Displacement over the cc limit in rulebook.
    HYDRO NA OPEN (Naturally ASPIRATED) CLASSES ‐ The Hydro NA OPEN class will include
    all PWC that are NOT supercharged, turbo charged or are intake boosted in any way. The Hydro NA Open classes
    will adhere to all Open RUNABOUT CLASS technical rules outlined in the 2011 IJSBA rulebook in regard to
    runabouts.
    RULE 26 ‐ TECHNICAL RULES – MODIFIED CLASS
    HYDRO NA
    26.1 OVERVIEW
    26.1.1 Open/Modified Classes are intended to promote the highest level of modification, handling, control and speed in the sport of
    personal watercraft racing. Watercraft competing in this class must conform to the specifications which follow. All watercraft must
    remain strictly stock except where rules allow or require substitutions or modifications. Changes or modifications not listed here are
    not permitted. Original equipment parts may be updated or backdated to original equipment parts of the same model. The part
    must be a bolt‐on type part requiring no modifications to that part or any other parts except where rules allow substitutions or
    modifications. The rules and regulations below are in additional to all General Technical rules listed in Rule 23.
    26.2 SEATS
    26.2.1 Seats ‐ Sport and Runabout Division Only: Seat assembly may be modified or aftermarket. The seat cover and padding may be
    changed. Seat height may be changed. NO Modification to the seat base are allowed.
    26.3 HULL
    26.3.1 Hull and Deck Repairs: Hull and deck repairs may be made. However, these repairs must not alter the standard configuration by
    more than 2.00mm (0.08 in.). Hull, bulkhead and deck may be internally reinforced. Fasteners may be installed through the hull,
    bulkhead and deck for the purposes of securing components to interior surfaces, provided a hazard is not created. Other than for the
    use of fasteners, the bulkhead may not be modified. Glue squeeze‐out may be removed from the hull.
    26.3.2 Trim Tabs: Aftermarket trim tabs, either fixed, automatic and/or rider controlled, may be used. Original equipment trim plates that
    are detachable from the hull may be removed or replaced when installing aftermarket trim tabs. Trim tabs cannot exceed the width
    of the planing surface or extend rearward more than 100mm (3.94 in.) beyond the end of the original planing surface.
    26.3.3 Hull Extensions: All hull extensions mounted on the hull’s transom will be considered as a trim tab. All edges must be radiused so as
    not to create a hazard. Fins, skegs, rudders and other appendages that may create a hazard are not allowed.
    26.4 AFTERMARKET OR MODIFIED HULLS
    26.4.1 Aftermarket Hull Classes: The following rules apply to the Expert Runabout Open and Pro‐Am Runabout Open classes only. All other
    classes must run a stock OEM hull.
    26.4.2 Hull: The hull may be modified or aftermarket but cannot exceed the length or width of the original equipment upper deck component of
    the bond flange as measured by a plumb bob (bumpers removed). Fins, rudders, skegs and other appendages that may create a hazard are
    not allowed.
    26.4.3 Deck: Original equipment deck must be used. Deck repairs may be made, provided they do not alter the standard configuration by
    more than 2.00mm (0.08 in.). The deck’s bond flange may not be modified. Deck may be internally reinforced.
    26.4.4 Weight Requirements: At all times, the watercraft must weigh no less than 10 percent under the watercraft’s original dry weight as
    determined by the IJSBA Technical Committee, providing the following:
    • Includes fuel and oil.
    • Includes the water in the waterbox, so long as the waterbox is not deemed to be out of ordinary in volume.
    • Includes the battery.
    • All reasonable amount of water must be removed from all compartments.
    • For a list of published weights and the method of computing the minimum weight see Addendum E.
    26.4.5 Fasteners: Fasteners may be installed through the hull and deck for the purpose of securing components to interior surfaces,
    provided that a hazard is not created.
    26.4.6 Rejoining Hull Components: If upper and lower components of the original equipment bond flange are separated and rejoined, they
    must be rejoined by the same method as original equipment (i.e., bonded together with a high‐strength adhesive).
    26.4.7 Engine Compartment Foam: Engine compartment foam may be removed, modified or aftermarket. Only floatation foam within the
    engine compartment may be removed. Only foam that can be removed without modification to any other part or parts, except
    where rules allow the parts to be modified, is allowed. Parts may not be relocated based on the removal of the foam. The hull’s inner
    liner or deck may not be cut or modified to remove foam. Removal of foam between layers of the hull and/or deck is not allowed.
    26.4.9 Hood Covers/Gauges/Mirrors and Handles: Storage covers, hatches, instrument cowlings and engine covers may be modified or
    aftermarket provided a hazard is not created and the OEM appearance is maintained. Additional engine compartment ventilation is
    allowed. Original equipment vents may be shielded or plugged. Handles, drop‐in type storage buckets and bolt‐on type mirrors may
    be modified, aftermarket or removed provided a hazard is not created.
    26.4.10 Ballast Weight: Ballast weight may be added prior to competition to meet the required weight limit. Ballast weight may be added
    within the normally exposed areas of the hull to alter the handling of the watercraft provided a hazard is not created. Only weight
    consisting of constant mass (i.e., water or other fluid is not allowed) that does not require the modification or relocation of any parts
    will be allowed unless such modification or relocation is specified by other rules.
    26.5 ENGINE ‐ TWO‐STROKE
    26.5.1 Engines: Engines may be bored. Aftermarket piston assemblies are allowed. The number, type, and placement of rings on piston may
    be changed.
    26.5.2 Engine Displacement: Engine displacement must not exceed class designation of 1399cc
    26.5.3 Crankcase: Original equipment crankcase must be used. Internal modifications to the fuel, oil and/or water‐exposed surfaces are
    allowed. Filler material may be added to hollow pockets in the base gasket areas. Base gasket and intake surfaces may be machined.
    Additional carburetor pulse line fittings may be installed. Bearing and seal surfaces may not be modified. Crankcase drain system may
    be removed and plugged. Repairs to cracked or punctured crankcases may be made provided only one damaged area affecting one
    cylinder bank has been repaired. No other external modifications or external repairs are allowed.
    26.5.4 Crankshaft: Crankshaft assembly may be modified or aftermarket. Stroke and rod length may be modified.
    26.5.5 Engine Balancing Assemblies: Engine balancing assemblies may be modified, aftermarket, or removed.
    26.5.6 Cylinders: Cylinders may be interchanged between watercraft of the same manufacturer. Any modifications to the cylinder or
    crankcase must be approved, in writing, by the IJSBA. Base gasket, head gasket and exhaust manifold gasket surfaces may be
    machined. Port heights, widths and shapes may be changed. Ports may be added or deleted from cylinder. Cylinders may be
    machined to accept after‐market cylinder liners. Epoxy‐type filler material may be added to hollow pockets in the base gasket areas
    and in the port area. Repairs to cracked or damaged cylinders may be made provided only one damaged area affecting one cylinder
    bank has been repaired. Cylinders may be machined to accept girdle‐type cylinder heads. Water cooling fittings may be added to
    cylinder. Exhaust power valve components and means of actuation may be modified or aftermarket.
    26.5.7 Cylinder Head: Cylinder head may be modified or aftermarket.
    26.5.8 Gaskets: Engine gaskets may be modified or aftermarket.
    26.5.9 Exhaust System: Exhaust system (i.e., manifold, head pipe, expansion chamber, waterbox, muffler(s), etc.) may be modified or
    aftermarket. Through‐hull exhaust may be modified or aftermarket, provided that a hazard is not created. The exit location of the
    exhaust gases may be relocated to the transom below the bond flange. No tuned portion of the exhaust system shall protrude
    outside the hull.
    26.5.10 Cooling System: Cooling system may be modified or aftermarket. Aftermarket cooling lines and water bypass systems may be used.
    Bypass fittings may be modified, aftermarket and/or relocated but must be directed downward and/or rearward so as not to create a
    hazard for other riders. Any valves used within the entire cooling system must be of the fixed type or automatic (e.g., thermostats,
    pressure regulators, solenoids, etc.). Manually controlled devices (by any means of actuation) that alter the flow of cooling water
    during operation are not allowed. Cooling system flush kits are allowed.
    26.7 AIR/FUEL DELIVERY ‐ TWO‐STROKE
    26.7.1 Carburetors: Carburetor(s) may be modified or aftermarket provided they do not vent or spill fuel at any attitude with or without the
    engine running. The number of venturis cannot exceed the number of cylinders. No slide‐type carburetors are allowed. Aftermarket
    primer may be used. Intake manifold assembly may be modified or aftermarket. Aftermarket crankcase pressure operated fuel
    pumps may be used.
    26.7.2 Fuel System: The entire fuel system is a closed system. The watercraft must not vent or spill fuel at any attitude with or without the
    engine running. Original equipment fuel tank, fuel filler, and relief valve must be used and cannot be modified. The fuel pickup, fuel
    filter, and fuel petcock may be removed and/or aftermarket. Additional fuel filters may be used and fuel cell foam may be added to
    the original equipment fuel tank. Fuel tank filler cap may be modified or aftermarket.
    26.7.3 Vapor Separators: Modified or aftermarket vapor/air separators must not exceed 2 in. x 6 in., and must have a return line to the fuel
    tank open at all times. Additional fuel reservoirs may not be used.
    26.7.4 Fuel Pumps: Aftermarket or modified electric fuel pumps, not exceeding 4psi, may be used. When the engine is shut off or stops, the
    fuel pump must automatically stop. No manually operated on/off‐type fuel pumps are allowed.
    26.7.5 Fuel Injection Systems: Aftermarket fuel injection systems and components are allowed provided the following regulations are
    adhered to: High‐pressure fuel hose meeting SAE J30R9 must be used; A.N. threaded‐type fittings or equivalent and non‐removable,
    crimped‐type clamps must be used on the high‐pressure portion of the system (i.e., hose clamps, zip ties, etc. are not acceptable); only
    metal‐type fuel filters may be used on the high‐pressure portion of the system; all other in‐line filters must be installed on the lowpressure
    portion of the system.
    26.7.6 Flame Arresters: Flame arrester(s) which satisfy United States Coast Guard, SAE‐J1928 Marine or UL‐1 111 Marine backfire flame
    arrester test standards must be installed. Aftermarket flame arresters satisfying one of these test standards are allowed. Intake
    silencer may be removed. Flame arrestor mesh can not be removed or modified. Pre‐filter flame arrestor covers are allowed.
    26.7.7 Reed and Rotary Valves: Reed valve assemblies may be modified or aftermarket. Rotary valve may be modified or aftermarket.
    26.9 IGNITION AND ELECTRONICS ‐ TWO AND FOUR‐STROKE
    26.9.1 Electrical and Charging System: Ignition system, electrical box, flywheel and flywheel cover may be modified or aftermarket. Battery
    charging circuit may be disabled and/or removed.
    26.9.2 Relocation of Electrical Components: Relocation of electrical components (e.g., box or housing) is allowed in order to fit an
    aftermarket exhaust system (only the strict minimum needed). Modification will be subject to the Technical Directors’ approval.
    26.9.3 Relocation of Battery Box: Relocation of the battery box is allowed in order to fit an aftermarket exhaust system provided the
    relocated battery box and battery are securely fastened.
    26.9.4 Temperature Sensor: Engine temperature sensor assembly may be disconnected and/or removed.
    26.11 DRIVELINE AND PUMP
    26.11.1 Pump: Impeller, impeller housing, stator vane assembly, pump mounting plate and/or pump shoe may be modified or aftermarket.
    Additional cooling fittings may be installed. Visibility spout must be removed or plugged. Silicone adhesive sealant may be used in
    addition to original equipment seal to seal pump inlet.
    26.11.2 Pump Nozzle: Pump nozzle and directional nozzle may be modified or aftermarket. Overall length of the complete pump and nozzle
    assembly may be no more than 50.00mm (1.97 in.) longer than original equipment.
    26.11.3 Trim System: Aftermarket nozzle trim systems may be used.
    26.11.4 Driveline & Components: Couplers, bearing housing and driveshaft may be modified or aftermarket provided they maintain a 1:1
    drive ratio between the engine and the pump.
    26.12 OPEN CLASS SUMMARY
    26.12.1 The following items need not be OEM for participation in the NA Open Class:
    1) Engine Gaskets
    2) Flywheel Key
    3) Engine Mounts
    4) Ignition or ECU
    5) Fuel Filter, Fuel Hose
    6) Control Cables and Housings
    7) Carburetor Pivot Arm
    Throttle Lever, Handlebars, Grips
    9) Handlepole mounting bracket, bushings, spring or spring helper
    10) Coupler Dampers
    11) Coupler Shroud
    12) Pump Bearings
    13) Engine and Pump Seals
    14) Battery
    15) Mats, Decals, Hood Seal
    16) Bond Rails
    17) Flame Arrestors
    1 Impeller
    19) Ride plate
    20) Intake Grate
    21) Cylinder Head
    22) Exhaust System
    23) Carburetors
    24) Seats on Runabout/Sport models
    25) Bilge systems
    26) Engine compartment foam
    27) Pistons
    2 Cooling System lines and fittings
    29) Reed valve assemblies
    30) Pump assembly
    26.13
    COMMON REASONS FOR DISQUALIFICATION – OPEN
    26.13.1 The following is a list of common reasons for disqualification in the Open class; this listing is not necessary a complete one.
    1) Missing tow strap
    2) Upper deck modifications.
    3) Illegal hull modifications (inlet duct area main problem).
    4) Bulk head modifications.
    5) Displacement over the cc limit in rulebook.
    RULE 27 ‐ TECHNICAL RULES – MODIFIED CLASSES
    27.1 OVERVIEW
    27.1.1 Modified class competitors are allowed modifications to gain maximum machine and engine performance. Watercraft competing in
    a Modified class are allowed all Open class modifications listed in Rule 26 plus the additional specifications which follow.
    27.3 SEATS
    27.3.1 Sport and Runabout Division Only: Seat assembly may be modified or aftermarket. The seat cover and padding may be changed.
    Seat height may be changed.
    27.4 HULL
    27.4.1 Hull may be modified or aftermarket but cannot exceed the length or width of the original equipment upper deck component of the
    bond flange as measured by a plumb bob (bumpers removed). Fins, rudders, skegs and other appendages that may create a hazard
    will not be allowed.
    27.5 ENGINE
    27.5.1 Pistons and Rings: Engines may be bored. Aftermarket piston assemblies are allowed. Engine displacement must not exceed class
    designation (e.g., 800cc in Sport 800 Modified, etc.). The number, type, and placement of rings on piston may be changed.
    27.5.2 Crankcases: Crankcases may be interchanged between homologated watercraft of the same manufacturer. Crankcases must be of
    the same type (i.e., cylinder induction, crankcase induction or rotary valve induction) and number of cylinders as original equipment
    (no adding or deleting cylinders). Internal modifications to the fuel, oil and/or water exposed surfaces are allowed. Bearing and seal
    surfaces may not be modified. Filler material may be added to hollow pockets in the base gasket areas. Ignition/stator mounting area
    modifications are limited to spot facing, drilling and tapping threads for the purpose of mounting an after‐market or modified ignition
    system. Additional carburetor pulse line fittings may be installed. Crankcase drain system may be removed or plugged. Additional
    mounting holes, not to exceed 10.00mm (0.40 in.) diameter, are allowed provided they do not penetrate the internal surface of the
    cases. Base gasket and intake surfaces may be machined. Repairs to cracked or punctured crankcases may be made provided only
    one damaged area affecting one cylinder bank has been repaired. External modifications to the crankcase finish (e.g., plating,
    polishing and/or painting) are allowed for cosmetic purposes only. No other external modifications or external repairs will be
    allowed.
    27.5.3 Cylinder: Cylinder and cylinder head may be modified or aftermarket.
    27.5.4 Crankshaft Assembly: Crankshaft assembly may be modified or aftermarket. Stroke and rod length may be changed.
    27.5.5 Motor Mounts: Engine bed and motor mounts may be modified or aftermarket. Engine may be repositioned in the hull.
    27.6 IGNITION AND ELECTRONICS
    27.6.1 Ignition System: Ignition system, electrical box, flywheel and flywheel cover may be modified or aftermarket. Battery charging circuit
    may be disabled and/or removed.
    27.6.2 Battery: An additional battery and battery box may be used. Batteries must fit into a proper battery box and be securely fastened.
    Batteries may be relocated.
    HYDRO UNLIMITED CLASS – Designed to be the Premier Drag Racing class of the personal
    watercraft world, the Hydro Unlimited class allows the greatest amount of modifications, innovation,
    creative engineering, and fabrication. The Hydro Unlimited class will adhere to all IJSBA MODIFIED/GP
    RUNABOUT CLASS technical rules outlined in the 2011 IJSBA rule book (viewable at www.ijsba.com) in
    regard to runabouts with the following EXCEPTIONS;
    UNLIMITED CLASS RULE EXCEPTIONS:
    1. No minimum weight requirements
    2. Hull’s planning surface may exceed from transom bond line as defined by plum bob method, up to, but not
    exceeding 25 mm (ride plate may extend 15mm beyond this point, but only if transom has been extended.) No
    exception on bow area, port, or starboard bond lines. No skegs, rudders, or fins are allowed.
    3. Top deck may be modified or aftermarket while maintaining original OEM design, configuration, appearance, and
    proportions from OEM specs for that particular IJSBA Homologated model.
    4. Steering system may be relocated but must retain handlebar system with throttle, and engine cut‐off (lanyard)
    system attached to handlebars.
    5. Nitrous Oxide Boosting permitted, with respect to ALL “fuel induction” and “safety” rules outlined by the IJSBA
    rulebook being in FULL affect.
    6. Top Deck and Hull) can use any kind of composite materials
    7. (Participant) can use any kind of unleaded fuel burning combustion engines but it MUST BE BASED ON A
    IJSBA HOMOLOGATED RUNABOUT ENGINE
    8. Homologated PWC Engines can be utilized in any homologated PWC model (shell)
    9. Full modifications are allowed (crankshaft, cylinders, pistons, crankcases, valves, lifters, heads and
    exhaust)
    10. Four‐cylinder maximum.
    11. Transmission and pump are free to full modification but must stay “inboard” or “internal” and must
    utilize a water jet pump/impeller type of propulsion.
    RULE 28 ‐ TECHNICAL RULES – HYDRO UNLIMITED CLASS
    28.1 OVERVIEW
    28.1.1 Unlimited class competitors are allowed modifications to gain maximum machine and engine performance. Watercrafts competing
    in a Modified class are allowed all Open class modifications listed in Rule 26 plus the additional specifications which follow.
    28.5 ENGINE
    28.5.1 Pistons and Rings: Engines may be bored. Aftermarket piston assemblies are allowed. Engine displacement must not exceed class
    designation (e.g., 800cc in Sport 800 Modified, etc.). The number, type, and placement of rings on piston may be changed.
    28.5.2 Crankcases: Crankcases may be interchanged between homologated watercraft of DIFFERENT manufacturer. Internal modifications
    to the fuel, oil and/or water exposed surfaces are allowed. Bearing and seal surfaces may not be modified. Filler material may be
    added to hollow pockets in the base gasket areas. Ignition/stator mounting area modifications are limited to spot facing, drilling and
    tapping threads for the purpose of mounting an after‐market or modified ignition system. Additional carburetor pulse line fittings
    may be installed. Crankcase drain system may be removed or plugged. Additional mounting holes, not to exceed 10.00mm (0.40 in.)
    diameter, are allowed provided they do not penetrate the internal surface of the cases. Base gasket and intake surfaces may be
    machined. Repairs to cracked or punctured crankcases may be made provided only one damaged area affecting one cylinder bank
    has been repaired. External modifications to the crankcase finish (e.g., plating, polishing and/or painting) are allowed for cosmetic
    purposes only. No other external modifications or external repairs will be allowed.
    28.5.3 Cylinder: Cylinder and cylinder head may be modified or aftermarket.
    28.5.4 Crankshaft Assembly: Crankshaft assembly may be modified or aftermarket. Stroke and rod length may be changed.
    28.5.5 Motor Mounts: Engine bed and motor mounts may be modified or aftermarket. Engine may be repositioned in the hull.
    28.6 IGNITION AND ELECTRONICS
    28.6.1 Ignition System: Ignition system, electrical box, flywheel and flywheel cover may be modified or aftermarket. Battery charging circuit
    may be disabled and/or removed.
    28.6.2 Battery: An additional battery and battery box may be used. Batteries must fit into a proper battery box and be securely fastened.
    Batteries may be relocated.
    29.1 OVERVIEW
    29.2 SEATS
    29.2.1 Seats ‐ Sport and Runabout Division Only: Seat assembly may be modified or aftermarket. The seat cover and padding may be
    changed. Seat height may be changed. The seat base CAN be modified as long as it completely seals the engine/bilge compartment.
    29.3 HULL
    29.3.1 Hull and Deck Repairs: Hull and deck repairs may be made. However, these repairs must not alter the standard configuration by
    more than 2.00mm (0.08 in.). Hull, bulkhead and deck may be internally reinforced. Fasteners may be installed through the hull,
    bulkhead and deck for the purposes of securing components to interior surfaces, provided a hazard is not created. Other than for the
    use of fasteners, the bulkhead may not be modified. Glue squeeze‐out may be removed from the hull.
    29.3.2 Trim Tabs: Aftermarket trim tabs, either fixed, automatic and/or rider controlled, may be used. Original equipment trim plates that
    are detachable from the hull may be removed or replaced when installing aftermarket trim tabs. Trim tabs cannot exceed the width
    of the planing surface or extend rearward more than 100mm (3.94 in.) beyond the end of the original planing surface.
    29.3.3 Hull Extensions: All hull extensions mounted on the hull’s transom will be considered as a trim tab. All edges must be radiused so as
    not to create a hazard. Fins, skegs, rudders and other appendages that may create a hazard are not allowed.
    29.4 AFTERMARKET OR MODIFIED HULLS
    29.4.1 Aftermarket Hull Classes:
    29.4.2 Hull: The hull may be modified or aftermarket but cannot exceed the length or width of the original equipment upper deck component of
    the bond flange as measured by a plumb bob (bumpers removed). Fins, rudders, skegs and other appendages that may create a hazard are
    not allowed.
    29.4.3 Deck: Original equipment deck must be used. Deck repairs may be made, provided they do not alter the standard configuration by
    more than 2.00mm (0.08 in.). The deck’s bond flange may not be modified. Deck may be internally reinforced.
    29.4.5 Fasteners: Fasteners may be installed through the hull and deck for the purpose of securing components to interior surfaces,
    provided that a hazard is not created.
    29.4.6 Rejoining Hull Components: If upper and lower components of the original equipment bond flange are separated and rejoined, they
    must be rejoined by the same method as original equipment (i.e., bonded together with a high‐strength adhesive).
    29.4.7 Engine Compartment Foam: Engine compartment foam may be removed, modified or aftermarket. Only floatation foam within the
    engine compartment may be removed. Only foam that can be removed without modification to any other part or parts, except
    where rules allow the parts to be modified, is allowed. Parts may not be relocated based on the removal of the foam. The hull’s inner
    liner or deck may not be cut or modified to remove foam. Removal of foam between layers of the hull and/or deck is not allowed.
    29.4.9 Hood Covers/Gauges/Mirrors and Handles: Storage covers, hatches, instrument cowlings and engine covers may be modified or
    aftermarket provided a hazard is not created and the OEM appearance is maintained. Additional engine compartment ventilation is
    allowed. Original equipment vents may be shielded or plugged. Handles, drop‐in type storage buckets and bolt‐on type mirrors may
    be modified, aftermarket or removed provided a hazard is not created.
    29.4.10 Ballast Weight: Ballast weight may be added prior to competition to meet the required weight limit. Ballast weight may be added
    within the normally exposed areas of the hull to alter the handling of the watercraft provided a hazard is not created. Only weight
    consisting of constant mass (i.e., water or other fluid is not allowed) that does not require the modification or relocation of any parts
    will be allowed unless such modification or relocation is specified by other rules.
    29.5 ENGINE ‐ TWO‐STROKE
    29.5.1 Engines: Engines may be bored. Aftermarket piston assemblies are allowed. The number, type, and placement of rings on piston may
    be changed.
    29.5.2 Engine Displacement: Engine displacement must not exceed class designation. Exception – Maximum allowable cc over class
    designation may not exceed 850cc for all Open Ski classes.
    29.5.3 Crankcase: Original equipment crankcase must be used. Internal modifications to the fuel, oil and/or water‐exposed surfaces are
    allowed. Filler material may be added to hollow pockets in the base gasket areas. Base gasket and intake surfaces may be machined.
    Additional carburetor pulse line fittings may be installed. Bearing and seal surfaces may not be modified. Crankcase drain system may
    be removed and plugged. Repairs to cracked or punctured crankcases may be made provided only one damaged area affecting one
    cylinder bank has been repaired. No other external modifications or external repairs are allowed.
    29.5.4 Crankshaft: Crankshaft assembly may be modified or aftermarket. Stroke and rod length maybe modified.
    29.5.5 Engine Balancing Assemblies: Engine balancing assemblies may be modified, aftermarket, or removed.
    29.5.6 Cylinders: Cylinders may be interchanged between watercraft of the same manufacturer. Any modifications to the cylinder or
    crankcase must be approved, in writing, by the IJSBA. Base gasket, head gasket and exhaust manifold gasket surfaces may be
    machined. Port heights, widths and shapes may be changed. Ports may be added or deleted from cylinder. Cylinders may be
    machined to accept after‐market cylinder liners. Epoxy‐type filler material may be added to hollow pockets in the base gasket areas
    and in the port area. Repairs to cracked or damaged cylinders may be made provided only one damaged area affecting one cylinder
    bank has been repaired. Cylinders may be machined to accept girdle‐type cylinder heads. Water cooling fittings may be added to
    cylinder. Exhaust power valve components and means of actuation may be modified or aftermarket.
    29.5.7 Cylinder Head: Cylinder head may be modified or aftermarket.
    29.5.8 Gaskets: Engine gaskets may be modified or aftermarket.
    29.5.9 Exhaust System: Exhaust system (i.e., manifold, head pipe, expansion chamber, waterbox, muffler(s), etc.) may be modified or
    aftermarket. Through‐hull exhaust may be modified or aftermarket, provided that a hazard is not created. The exit location of the
    exhaust gases may be relocated to the transom below the bond flange. No tuned portion of the exhaust system shall protrude
    outside the hull.
    29.5.10 Cooling System: Cooling system may be modified or aftermarket. Aftermarket cooling lines and water bypass systems may be used.
    Bypass fittings may be modified, aftermarket and/or relocated but must be directed downward and/or rearward so as not to create a
    hazard for other riders. Any valves used within the entire cooling system must be of the fixed type or automatic (e.g., thermostats,
    pressure regulators, solenoids, etc.). Manually controlled devices (by any means of actuation) that alter the flow of cooling water
    during operation are not allowed. Cooling system flush kits are allowed.
    29.6 ENGINE ‐ FOUR‐STROKE
    29.6.1 Engine Block: Original engine block must be used. Internal modifications to the oil and/or water‐exposed surfaces will be allowed.
    The head gasket surface of the cylinder block may be machined.
    29.6.2 Cylinder Head: Cylinder head may be modified or aftermarket. Intake and exhaust runners may be modified. Material may be added
    to the runners. Intake and exhaust ports may be modified. Port diameters and shapes may be changed. Combustion chambers may
    be modified. Material may be added to the combustion chamber. The original number of intake and exhaust valves must be the
    same as original. Repairs to the cylinder head affecting one cylinder bank are allowed. The head gasket surface may be machined.
    29.6.3 Valve train and Components: Aftermarket valve train components are allowed provided the original method of activation is maintained
    (e.g., if originally activated by a camshaft, they may not convert to solenoid activation). Valves may be shimmed with OEM or aftermarket
    shims. Valve springs may be modified or aftermarket. Camshaft(s) may be aftermarket. The number of camshafts must be the same as
    original. Original bearing type and dimensions must be used. Cam timing may be changed. Cam gears, tensioners, chain or belt may be
    modified or aftermarket.
    29.6.4 Engine: Engines may be bored. Aftermarket piston assemblies are allowed. Engine displacement must not exceed class designation
    (e.g., 1300cc in Pro‐Am Run Open, 2000cc for 4‐Stroke Open, etc.).
    29.6.5 Engine Displacement Open Ski Classes: For all Open Ski classes the displacement must not exceed 800cc for four‐stroke watercraft.
    29.6.6 Crankshaft: Crankshaft may be modified or aftermarket. Stroke must remain the same as original. Total weight of the crankshaft
    must be within +/‐5.00% of the original equipment weight. Replacement bearings or bearing shells are allowed provided that they
    maintain their original type and dimensions.
    29.6.7 Engine Balancing Assemblies: Engine balancing assemblies may be modified, aftermarket or removed.
    29.6.8 Rods: Aftermarket connecting rods made of ferrous materials are allowed. Rod length may be changed.
    29.6.9 Exhaust System: Exhaust system (i.e., manifold, connecting pipes, hoses, muffler(s), etc.) may be modified or aftermarket. Throughhull
    exhaust may be modified or aftermarket, provided that a hazard is not created. No tuned portion of the exhaust system may
    protrude outside of the hull. Exit location of the exhaust gases may be relocated to the transom below the bond flange of the boat.
    29.6.10 Cooling System: The cooling system may be modified or aftermarket and additional cooling lines may be added. Aftermarket water
    bypass systems may be used. Cooling system bypass fittings may be modified or aftermarket and/or relocated, however, if relocated,
    the fittings must be directed downward and/or rearward so as not to create a hazard for other riders. Any valves that are used within
    the entire cooling system must be of the fixed type or automatic (e.g., thermostats, pressure regulators, solenoids, etc.). Manually
    controlled devices (by means of actuation) that alter the flow of cooling water during operation are not allowed. Original cooling
    system thermostat may be removed, modified or aftermarket. Cooling system flush kits are allowed.
    29.6.11 Oil Reservoir and Oil Pump: Baffles in the oil reservoir may be modified. The addition of baffles in oil reservoir is allowed. Oil pump
    may be modified or aftermarket.
    29.6.12 Valve Cover: The valve cover may be replaced for cosmetic purposes and/or weight reduction only.
    29.7 AIR/FUEL DELIVERY ‐ TWO‐STROKE
    29.7.1 Carburetors: Carburetor(s) may be modified or aftermarket provided they do not vent or spill fuel at any attitude with or without the
    engine running. The number of venturis cannot exceed the number of cylinders. No slide‐type carburetors are allowed. Aftermarket
    primer may be used. Intake manifold assembly may be modified or aftermarket. Aftermarket crankcase pressure operated fuel
    pumps may be used.
    29.7.2 Fuel System: The entire fuel system is a closed system. The watercraft must not vent or spill fuel at any attitude with or without the
    engine running. Original equipment fuel tank, fuel filler, and relief valve must be used and cannot be modified. The fuel pickup, fuel
    filter, and fuel petcock may be removed and/or aftermarket. Additional fuel filters may be used and fuel cell foam may be added to
    the original equipment fuel tank. Fuel tank filler cap may be modified or aftermarket.
    29.7.3 Vapor Separators: Modified or aftermarket vapor/air separators must not exceed 2 in. x 6 in., and must have a return line to the fuel
    tank open at all times. Additional fuel reservoirs may not be used.
    29.7.4 Fuel Pumps: Aftermarket or modified electric fuel pumps, not exceeding 4psi, may be used. When the engine is shut off or stops, the
    fuel pump must automatically stop. No manually operated on/off‐type fuel pumps are allowed.
    29.7.5 Fuel Injection Systems: Aftermarket fuel injection systems and components are allowed provided the following regulations are
    adhered to: High‐pressure fuel hose meeting SAE J30R9 must be used; A.N. threaded‐type fittings or equivalent and non‐removable,
    crimped‐type clamps must be used on the high‐pressure portion of the system (i.e., hose clamps, zip ties, etc. are not acceptable); only
    metal‐type fuel filters may be used on the high‐pressure portion of the system; all other in‐line filters must be installed on the lowpressure
    portion of the system.
    29.7.6 Flame Arresters: Flame arrester(s) which satisfy United States Coast Guard, SAE‐J1928 Marine or UL‐1 111 Marine backfire flame
    arrester test standards must be installed. Aftermarket flame arresters satisfying one of these test standards are allowed. Intake
    silencer may be removed. Flame arrestor mesh can not be removed or modified. Pre‐filter flame arrestor covers are allowed.
    29.7.7 Reed and Rotary Valves: Reed valve assemblies may be modified or aftermarket. Rotary valve may be modified or aftermarket.
    29.8 AIR/FUEL DELIVERY ‐ FOUR‐STROKE
    29.8.1 Fuel System: The original fuel injectors may be modified to increase fuel‐flow rate. Aftermarket fuel injectors that increase fuel flow are
    allowed provided they must not increase airflow into the combustion chamber. Fuel rail and fuel regulator may be modified or
    aftermarket. Additional fuel injectors may be added. Aftermarket fuel pumps are allowed provided that when the engine is shut off or
    stops, the fuel pump must automatically stop. No manually operated on/off fuel pumps are allowed. High‐pressure fuel hose meeting
    SAE J30R9 must be used; only metal‐type fuel filters may be used on the high‐pressure portion of the system; all other in‐line filters
    must be installed on the low‐pressure portion of the system.
    29.8.2 Flame Arresters: Flame arresters that meet USCG, UL‐1 111 or SAE J‐1928 Marine standards must be used. Airflow sensor may be
    modified, aftermarket or removed. Ducting between the flame arrestor and throttle body may be modified or aftermarket. Flame
    arrestor mesh can not be removed or modified. Pre‐filter flame arrestor covers are allowed.
    29.8.3 Throttle Body: Throttle body may be modified or aftermarket. The number of butterflies may be increased but may not exceed the
    number of cylinders.
    29.8.4 Intake Manifold: Intake manifold assembly may be modified or aftermarket.
    29.8.5 Carburetor: Carburetor(s) may be modified or aftermarket provided they do not vent or spill fuel at any attitude with or without the
    engine running. Carburetors may be used in addition to or in place of the fuel injection system. The number of venturis cannot
    exceed the number of cylinders. No slide‐type carburetors. Aftermarket primer may be used. Intake manifold assembly may be
    modified or aftermarket. Aftermarket air‐pulse‐pressure operated fuel pumps may be used.
    29.9
    IGNITION AND ELECTRONICS ‐ TWO AND FOUR‐STROKE
    29.9.1 Electrical and Charging System: Ignition system, electrical box, flywheel and flywheel cover may be modified or aftermarket. Battery
    charging circuit may be disabled and/or removed.
    29.9.2 Relocation of Electrical Components: Relocation of electrical components (e.g., box or housing) is allowed in order to fit an
    aftermarket exhaust system (only the strict minimum needed). Modification will be subject to the Technical Directors’ approval.
    29.9.3 Relocation of Battery Box: Relocation of the battery box is allowed in order to fit an aftermarket exhaust system provided the
    relocated battery box and battery are securely fastened.
    29.9.4 Temperature Sensor: Engine temperature sensor assembly may be disconnected and/or removed.
    29.10 TURBOCHARGER/SUPERCHARGER
    29.10.1 Modified and Aftermarket Turbo/Superchargers: Aftermarket turbochargers and superchargers may be used provided a hazard is
    not created. Original turbocharger or supercharger may be modified. Aftermarket turbochargers and superchargers may be added to
    originally normally aspirated watercraft. Turbocharger housing must be of the full circulating, water‐jacket type at all times when the
    engine is running. All hoses and pipes may be modified or aftermarket.
    29.10.2 Intercooler: Intercooler may be modified or aftermarket.
    29.10.3 Boost Valve: Boost pressure‐relief valve may be modified or aftermarket
    29.10.4 Boost Sensor: Boost sensor may be modified or aftermarket.
    29.11 DRIVELINE AND PUMP
    29.11.1 Pump: Impeller, impeller housing, stator vane assembly, pump mounting plate and/or pump shoe may be modified or aftermarket.
    Additional cooling fittings may be installed. Visibility spout must be removed or plugged. Silicone adhesive sealant may be used in
    addition to original equipment seal to seal pump inlet.
    29.11.2 Pump Nozzle: Pump nozzle and directional nozzle may be modified or aftermarket. Overall length of the complete pump and nozzle
    assembly may be no more than 50.00mm (1.97 in.) longer than original equipment.
    29.11.3 Trim System: Aftermarket nozzle trim systems may be used.
    29.11.4 Driveline & Components: Couplers, bearing housing and driveshaft may be modified or aftermarket provided they maintain a 1:1
    drive ratio between the engine and the pump.
    29.12 UNLIMITED CLASS SUMMARY
    29.12.1 The following items need not be OEM for participation in the Unlimited Class:
    1) Engine Gaskets
    2) Flywheel Key
    3) Engine Mounts
    4) Ignition or ECU
    5) Fuel Filter, Fuel Hose
    6) Control Cables and Housings
    7) Carburetor Pivot Arm
    Throttle Lever, Handlebars, Grips
    9) Handlepole mounting bracket, bushings, spring or spring helper
    10) Coupler Dampers
    11) Coupler Shroud
    12) Pump Bearings
    13) Engine and Pump Seals
    14) Battery
    15) Mats, Decals, Hood Seal
    16) Bond Rails
    17) Flame Arrestors
    1 Impeller
    19) Ride plate
    20) Intake Grate
    21) Cylinder Head
    22) Exhaust System
    23) Carburetors
    24) Seats on Runabout/Sport models
    25) Bilge systems
    26) Engine compartment foam
    27) Pistons
    2 Cooling System lines and fittings
    29) Reed valve assemblies
    30) Pump assembly
    31) Hull
    29.13
    COMMON REASONS FOR DISQUALIFICATION – UNLIMITED
    29.13.1 The following is a list of common reasons for disqualification in the Unlimited class; this listing is not necessary a complete list of all
    reasons that a rider/PWC may be disqualified, but include the most common reasons.
    1) Missing tow strap.
    2) Upper deck modifications – that significantly change the appearance in shape from the OEM design‐.
    3) Displacement over the cc limit in rulebook.
    4) Illegal Fuel
    Competition Rules
    All aspects of competition outlined in the 2011 IJSBA rulebook will be adhered to.
    FOR MORE INFORMATION ON THE COMPLETE RULES AS OUTLINED BY THE IJSBA PLEASE VISIT WWW.IJSBA.COM.
    FOR MORE SPECIFIC INFORMATION ON THE HYDRODRAG EVENTS PLEASE CONTACT MIKE YOUNG AT 850.378.5495 or
    [email protected]

  3. #3
    Moderator beerdart's Avatar
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    Thanks for posting Mike..

    As far as turbos can a Polaris MSX with turbo run in Superstock? as they came stock with turbos like Honda..

  4. #4
    Banned User
    Join Date
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    cant wait! Welcome back Champ! My name is Mike Young and Tim has handed my the reigns of this prestigeous event and want evryone to know that we are making every effort to make this event the industry standard for competitve HydroDrag Racing. I appreciate all the support from everyone! There will be a change/addendum to the Hydro Superstock Classes, and it will be forthcoming. If there are racers that have set up already under those specs on the website, I will create a Class for those "Limited" boats! Hope to see you all there and in Havasu! I can be reached at [email protected] or via the website...prohydroxtour.com.

    http://www.greenhulk.net/forums/show...155729&page=15

    So is there going to be a limited class Mike?

  5. #5
    shhr's Avatar
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    So is there going to be a limited class Mike?
    +1

  6. #6

  7. #7
    Orlando Shark's Avatar
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    "Only Honda PWC can run turbochargers in Superstock"

    This is pretty funny...Maybe the Mystical 94 MPH Honda will show up one day....

  8. #8
    Yes, there will be a limited class!

  9. #9
    Congratulation mike for the races let make the 2012

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