Page 1 of 2 1 2 LastLast
Results 1 to 10 of 15
  1. #1
    Jarrett's Avatar
    Join Date
    Apr 2005
    Location
    Waxahachie, TX
    Posts
    3,011
    +1
    77

    Need some help on mods between different classes

    Can anyone help me understand what mods are allowed in each class specifically for 4 stroke N/A runabouts?

    Like for example:

    Stock = aftermarket prop, aftermarket grate, aftermarket ECU, aftermarket K&N type air system
    Limited = aftermarket exhaust
    Open = everything else

    I'm trying to figure out what class my Yamaha VXS would be as it stands today with the mods I have on it. I've looked at the ISJBA rulebook and still a little confused.


  2. #2
    Jarrett, what mods are on your VXS? Most likely it will fall under the Stock or Stock Lites class.

  3. #3
    Jarrett's Avatar
    Join Date
    Apr 2005
    Location
    Waxahachie, TX
    Posts
    3,011
    +1
    77
    DIY K&N type air intake
    Stock ribbon filter removed from intake manifold
    Riva SS intake grate
    V-Tech Stage 1 Reflashed ECU
    Removed stock spacers from ride plate
    R&D Free Flow Exhaust
    Skat prop

  4. #4
    Well i'd have to dig into the rule book and double sheck but with the exhaust and re-programmed ECU i'm pretty sure thats going to fall in the Limited category

  5. #5
    bullett55's Avatar
    Join Date
    Apr 2008
    Location
    socal
    Posts
    509
    +1
    66
    ECU is ok for Stock Class, exhaust mods are not. Exhaust (and pump) mods bump you to Limited Class.

    Only sanctioned class (currently) in USA where VXRs can be competitive is the R/A N/A Class . This Class blends the N/A 2-strokes and the N/A 4-strokes.
    In this class the 4-strokes (again, this is USA) must run by stock class rules.
    The 2-strokes are allowed to run by limited class rules.

    This actually (imo) makes a fairly level playing field, and still gives the 2-strokes a place to race (the old "classic" 2-stroke classes are being eliminated). It also gives ppl with the newer less expensive N/A 4-strokes (VXR, GTI etc) a place to race more economically than most of the forced induction classes.

  6. #6
    Jarrett's Avatar
    Join Date
    Apr 2005
    Location
    Waxahachie, TX
    Posts
    3,011
    +1
    77
    Thanks for the info. It takes about 30 minutes to put the stock exhaust back on if that's the only thing that is keeping it from one class or another. Especially since it adds no performance whatsoever.

  7. #7
    Moderator #985 lasportsmn's Avatar
    Join Date
    Oct 2008
    Location
    Pierre Part, Louisiana
    Posts
    4,780
    +1
    358
    http://www.ijsba.com/ijsba/index.cfm...t=rulebook.cfm

    Here is the rulebook. Is the exhause run through the original through hull or did you have to relocate it.

  8. #8
    Jarrett's Avatar
    Join Date
    Apr 2005
    Location
    Waxahachie, TX
    Posts
    3,011
    +1
    77
    Did not relocate. Same exit port. I'm wondering if it matters because looking at the R5 and Outlaw sites and it looks like mostly Limited stuff.

    R5:
    "HOT" Classes Meaning these are the classes that have been fairly popular for the past couple of years those eligible to run these classes are Novice, Amatuer & Expert card holders.

    Hot Classes:
    Beginner R/A Limited

    Optional Classes meaning these are the classes that must have 3 or more racers for the class to make. These classes as of right now WILL NOT be listed on the entry form.

    Optional Classes:
    Runabout N/A Stk
    Runabout N/A Limited
    Womens R/A

    Outlaw has these:
    Beginner Runabout Modified
    Amateur Runabout 1300/4-Stroke NA Stock
    Amateur Runabout 1300/4-Stroke NA Modified

  9. #9
    Jarrett's Avatar
    Join Date
    Apr 2005
    Location
    Waxahachie, TX
    Posts
    3,011
    +1
    77
    Looking at the rules for stock, I see Two Stroke exhaust mentioned, but not Four Stroke. I'm thinking she might be able to run in the Stock classes?

  10. #10
    R5 Water-X Racing Promoter PowerShot's Avatar
    Join Date
    Jul 2007
    Posts
    620
    +1
    2
    Email Scott Frazier at [email protected] or [email protected] to get the "OFFICIAL" ruling on your question as that is the only thing that is accepted is clarification from the IJSBA and an official ruling. Anything on a website unless its the IJSBA website or stated from the IJSBA is deemed unofficial.

    I am pretty sure the freeflow exhaust is not allowed in stock class racing whether its N/A or just regular stock class. Ill double check but your best bet is to contact Scott.

    If you dont get a response in a timely manner let me know and Ill see if I can help you. Hope to see you at the final round in Baytown, TX Sept 1-2nd

    Check out www.r5waterxracing.com for more info or call us at 214-498-3592

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. need some help on a 1999 GSX limited
    By Texwing in forum Sea Doo Open Discussion
    Replies: 8
    Last Post: 08-10-2014, 12:17 PM
  2. need some help on a 1998 seadoo gtx ltd
    By sleblanc in forum 2-Stroke Performance
    Replies: 10
    Last Post: 04-06-2010, 05:39 AM
  3. Need Some help on a Mod Setup: Injectors???
    By thompsdw in forum 4-Tec Performance
    Replies: 5
    Last Post: 09-22-2009, 06:04 PM
  4. Need some help on deciding what to do.
    By chrishoward81 in forum Yamaha Old School Skis
    Replies: 6
    Last Post: 02-11-2009, 10:15 AM
  5. need some help on sx650
    By massSL780 in forum Kawasaki Open Discussion
    Replies: 4
    Last Post: 02-13-2007, 08:15 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •