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  1. #1

    97' gp1200 65u in GPR hull

    Hey guys i have a 97 gp1200 with lots of money invested in the motor (milled head/ported/big freshly rebuilt mikuni carbs/exhaust) and some other goodies. I lost compression in piston 3 and will be rebuilding my top end once again. I am very satisfied with the power of this motor as well as the reliability, however i am extremely dissapointed with the way this hull porpoises and it is a really uncomfortable ride since it flips extremely easily and i find it very hard to keep it in the water even in a flat lake it jumps like crazy! So i was thinking of putting this motor in a gpr hull which i have ridden in the past and find much better by far. My question is what exactly has to be modified to fit? Does the engine bolt right up or would i need to make or move the motor mounts? Does the shaft bolt up or does te coupler have to be changed or have the shaft cut? Everything else is pretty straightforward as i will be using the cdi i have now as well as the gauges that i will make fit on the gpr dash. Any help would be appreciated and thanks in advance


  2. #2
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    A properly set up GP hull does not bounce, I can superman with my trim up.

  3. #3
    What exactly is the proper setup? Heres a picture of my sponsoons which according to some of the users on here, are in the correct position to stop the bouncing.


  4. #4
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    I am assuming you have aluminum trim tabs. What plate are you running?

  5. #5
    txgp1812fzs's Avatar
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    If 97gpsleeper is advising you listen up he knows what hes doing.

  6. #6
    Yes im definitely always open to any advice an i thank gpsleeper for trying to help. I currently cant remember exactly what rideplate i have but ill be home in about 2 hours and ill let you know i do know however that its an aftermarket plate. And i do not have trim tabs. Do those help?

  7. #7
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    Part of your problem is you do not have trim tabs. The 97 GP's came from the factory with junk plastic tabs that broke off, leaving only the recessed bolts behind. The fix for this came from the aftermarket, with aluminum tabs.

  8. #8
    Do you have a link to the aluminum tabs so i can take a look a them?

  9. #9
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    They are not made my Riva or Protec anymore, but forum member Krispaintballz or Osidebill have a template and can probably make you some.

  10. #10
    Heres a shot of the engine


    And now you guys know what i mean when i say BOUNCY!!

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