Results 1 to 10 of 10
  1. #1
    skigolfnut's Avatar
    Join Date
    Jun 2009
    Location
    League City TX
    Posts
    1,979
    +1
    33

    The biggest injectors that seadoo put in there stock ski?

    I am working within the IJSBA guidlines and I can use any year stock seadoo injector,
    did they ever put anything bigger other that 42 bosh injectors??


  2. #2
    Eric Ocman's Avatar
    Join Date
    Aug 2008
    Location
    Cataula, Georgia, United States
    Posts
    4,700
    +1
    77

    Re: The biggest injectors that seadoo put in there stock ski?

    48s are in the 2012rxpx

  3. #3
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Location
    Morgan City, LA
    Posts
    36,398
    +1
    2,524
    Quote Originally Posted by skigolfnut View Post
    I am working within the IJSBA guidlines and I can use any year stock seadoo injector,
    did they ever put anything bigger other that 42 bosh injectors??

    All iControl skis use a 48 lb injector

  4. #4
    skigolfnut's Avatar
    Join Date
    Jun 2009
    Location
    League City TX
    Posts
    1,979
    +1
    33
    cool, I have the Et-137 wheel which is legal in limited class, and I have the Rotax racing ecu that is set for 8650 rpms, would the 48 lb injectors help me gain any more top speed or hole shot? any thing? or should I raise my limiter?
    I currently have the valve train up grade with the Supertech springs and keepers
    My afrs are good across the board with my 42's but I keep getting smoked by the G. L. and his Kawi 300 and he is stock class,
    I have got to squeeze more speed out of this thing,

  5. #5
    83.0 @ 8400 jhill19's Avatar
    Join Date
    Jul 2010
    Location
    Teays Valley, West Virginia
    Posts
    2,800
    +1
    81

    The biggest injectors that seadoo put in there stock ski?

    If your afr is good richening it up won't help pick anymore speed or hole shot.

  6. #6
    boost junkie skidoochris's Avatar
    Join Date
    Mar 2012
    Location
    Davison, Mi
    Posts
    4,494
    +1
    476
    what pistons can you run?
    a 155hp has 10.5:1 and would help for the hole shot and top end
    and they would need more fuel
    IMO you should raise your limiter untill you can not hit it in flat water

  7. #7
    skigolfnut's Avatar
    Join Date
    Jun 2009
    Location
    League City TX
    Posts
    1,979
    +1
    33
    I am like most racers looking for the best bang for the buck,
    higher rev limiter, more RPM'S, more speed,
    I guess if my 42's cant keep up with the afr's then I get the 48's

    see piston ruling below,

    7.8.2 ENGINE — FOUR-STROKE (RUNABOUTS ONLY)
    7.8.2.1 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 (ie 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 original equipment. Engine displacement must not exceed
    class designation unless otherwise noted. Chamfering of cylinder ports must not exceed 1.00mm (0.04 in.) at a 30 degree
    maximum angle. (See diagram in Appendix.).
    I

  8. #8
    Banned User
    Join Date
    Jan 2009
    Location
    LA/oc
    Posts
    3,911
    +1
    129

    The biggest injectors that seadoo put in there stock ski?

    You need to work on hook up of the ski not mph IMO. That's why your getting smoked by GL.

  9. #9
    boost junkie skidoochris's Avatar
    Join Date
    Mar 2012
    Location
    Davison, Mi
    Posts
    4,494
    +1
    476
    Quote Originally Posted by FIRE0021 View Post
    You need to work on hook up of the ski not mph IMO. That's why your getting smoked by GL.

    thats where you are wrong, you need both... the kaw uses a roots type charger and they make boost much faster than a centrifugal(seadoo) type
    so to build boost faster on a seadoo you need high comp pistons to have more hp at lower and high rpms
    and as long as you have good gas it will not be a problem
    the 300 still has a big advantage in boost but its heavier and not as fast


  10. #10
    skigolfnut's Avatar
    Join Date
    Jun 2009
    Location
    League City TX
    Posts
    1,979
    +1
    33
    I am eliminating the carbon ring set up and going with a shaft seal set up to eliminate my cavitation off the line on the rubber-band starts,
    That 2-3 second lag is really hurting me off the line, a couple of x skis jump off the line but I catch them before the first turn and stay in front,
    This last race I had put on some pro block offs and they really worked well, the ski didn't bounce as much and stayed down thru the turns,

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Replies: 3
    Last Post: 05-06-2011, 09:05 PM
  2. what ratio fuel:oil should i put in my stock 96 raider?
    By 1100tripple in forum Yamaha Old School Skis
    Replies: 7
    Last Post: 07-18-2009, 10:18 AM
  3. What are the jumps caled that are used in some races?
    By Camy1448 in forum Race Events and News
    Replies: 4
    Last Post: 07-02-2007, 03:55 AM
  4. What are the jumps caled that are used in some races?
    By Camy1448 in forum 4-Tec Performance
    Replies: 3
    Last Post: 06-27-2007, 12:25 PM
  5. Can i run race gas in my stock ski?
    By superduty in forum 4-Tec Performance
    Replies: 8
    Last Post: 09-26-2006, 02:59 AM

Posting Permissions

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