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  1. #1

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    Angry gp1200r keeps snaping flywheels

    Hi All
    Got a problem with a GP1200R........it keeps eating flywheels.
    I have had some bits done to it, she is pulling about 187 BHP and 119 lbs torque.
    The standard flywheel keeps braking the shaft (2 in less then 10 hours skiing) would it be Worth getting a lighten one
    Your views on this would be most welcome.

    Thanks
    Bill
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  2. #2
    Happily Self-Employed WFO's Avatar
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    Welcome Bill

    Some of the ole skool guys should chime in here shortly

  3. #3
    Moderator RX951's Avatar
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    Welcome to the Forum

    Have all these been used or new flywheels you are installing?
    If used: Are they in Good condition?
    What type of riding does this motor see ? Race / Rec ?
    What kind of mods does your motor have?
    Is it a triple pipe boat or single pipe?

  4. #4

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    portsmouth, england
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    crank is phased trued & welded, oil bank off,carbon reeds, flat top pistons, pro-tech turbo exhaust, pro-tech rec head, advent ecu and re jetted carbs

    67.MPH (radar gun)

  5. #5
    All hail the Chief! fullboogie's Avatar
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    Are the new flywheels being lapped to the crank snout and the bolt properly torqued? Wonder if the rotating assembly needs balancing?

  6. #6
    spud's Avatar
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    Never re-use a flywheel after a snapped snout unless you have it balanced. Lap the flywheel to the crank. Some people radius the sharp angle on the flywheel.

  7. #7
    Moderator RX951's Avatar
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    yep....always "lap"

  8. #8
    I wouldn't think lightening would help the structural integrety of the wheel. If the wheels are new I would have to think alignment. Lapping would help the indexing. Check the other gear teeth for flaws as it has taken 2 flywheels.

  9. #9

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    Thanks for all the info
    The flywheels where used, please can you tell me what lapping is in lay-mens terms.
    Not sure of the time over the "pond" it is 8:42 pm here.
    Nice to have some fellow jet skiers that know what they are talking about.
    Thanks again
    bill

  10. #10
    Old Ski Insanity w/rpm500's Avatar
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