Gsxl rossier 951 wont rev
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  1. #1
    PWCToday Regular scensor's Avatar
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    Gsxl rossier 951 wont rev

    Good day to all,

    Gsxl white engine fully rebuild last summer approx 10 hours on pistons. This summer I decided to add a new miller q head and a rossier pipe with Mani and ecwi. Everything bolted fine and ski fires up and revs on trailer and even when hooked up on the water.
    964cc with Prox 1st size bore Miller Q head 47,5cc domes 130psi compression both cylinders, delta force v2 reed, lowered stock intake, stock carbs rejected and acc pump removed. MPEM from novi single coil with Coffman curve. And plastic pump with 15/20 solas. Ski fires both while on trailer or on water. At trailer it revs without issues. While on water it stacks at 4200-4250. Raves are drilled. Pipe is pressure tested and reeds are okay. One thing I wanna add is that the engine is fully ported and the rossier manifold is so extremely ported that it has me concerned, can it be the huge manifold;; what am I missing. Any ideas fellow jet skiers;;



    Thank you all in advance,
    Tassos

  2. #2
    PWCToday Regular scensor's Avatar
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    Re: Gsxl rossier 951 wont rev

    No one?? Come on crazy old seadoo ers

  3. #3
    Resident Guru JC-SuperJet's Avatar
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    Re: Gsxl rossier 951 wont rev

    Call or email Watercraft Magic http://www.watercraftmagic.net/Water...agic/Home.html

    951 Seadoo experts...
    Last edited by JC-SuperJet; 07-04-2017 at 01:40 PM.

  4. #4
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
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    Re: Gsxl rossier 951 wont rev

    Manifold is ported? Those where made with more internal room to start with. If any water is escaping from it into the exhaust then it will kill rpm. Many times there is not even enough material in there to cover the shafts of the bolts that secure it to the cylinder so I'm thinking maybe they go into the water jacket a little?

    You can pull the pipe off the coupler and set a water hose up on the manifold's 1/2" fitting for a quick test.

  5. #5
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Gsxl rossier 951 wont rev

    You sure the rave solenoid is working?
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  6. #6
    PWCToday Regular scensor's Avatar
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    Re: Gsxl rossier 951 wont rev

    Raves driller and work perfect. Tested em on my other ski.

  7. #7
    Resident Guru SURFnTURF's Avatar
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    Re: Gsxl rossier 951 wont rev

    Is it running rough when it max's at 4200 revs ? Like a bad plug or coil breaking down ?
    If it doesn't run rough I would then look at the carbs not set up properly.
    Did you test Pop off,clean fuel lines,fuel selector,filters etc

  8. #8
    PWCToday Regular scensor's Avatar
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    Re: Gsxl rossier 951 wont rev

    It runs like it is maxxed out. Carbs have just been rebuilded fuel lines are new. Pop off checked and its okay.illget em off tomorrow and rechek them

  9. #9
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Gsxl rossier 951 wont rev

    While the carbs are off use a mirror and flashlight and inspect the reeds.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  10. #10
    PWCToday Regular scensor's Avatar
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    Re: Gsxl rossier 951 wont rev

    So swapped everything and I taped my PTO measured avance and idle at 17 deegres and when revving drops to 7. There's my issue my reprogramm is wrong, they inputed wrong programm

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