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  1. #1

    What Can You Do To stop Porpoising 99 gp1200

    A friend of mine has a 99 gp 1200 and he was wondering what he can do to stop it from porpoising. Can you get a different rideplate or something? It is completly stock. Donald


  2. #2

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    the only way i ever found was to turn the motor off and drink a beer!

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    DAGO RACING CREW 97GPSLEEPER's Avatar
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    A stock 97 GP plate is longer than the stock 99 plate and will help with the porpoising. Any aftermarket plate that is longer than the stock 99 will help. Trim tabs will also help. He could also get a 97 GP pump nozzle. The 98 & 99's have a 5 degree nozzle, the 97 is a 0 degree nozzle. Lowering the sponsons will help too.

  4. #4
    So you can put trim tabs on this model. Where would be a good place to get trim tabs and a ride plate for this machine? Donald

  5. #5
    Canadian POWERHOUSE CanadianGPR's Avatar
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    I put an aftermarket ride plate and trim tabs and it took most of the bounce out.

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    I think i still have a stock 97 rideplate. you dont want the stock 97 trim tabs, they are plastic. you cover the freight and the plate is free.

  7. #7
    Flying Scotsman's Avatar
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    Yep it can be done.
    I recomend changing the sponsons as well.

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    Quote Originally Posted by CARVER View Post
    I think i still have a stock 97 rideplate. you dont want the stock 97 trim tabs, they are plastic. you cover the freight and the plate is free.

    The plate, 0 degree and the tabs will get it done.

  9. #9
    I've never owned a GP1200 but could he just shim the rear of the ride plate down some like we do?

  10. #10
    God of the Wave spyder3000gtvr4's Avatar
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    i took my 98 gp12 out yesterday i have an aftermarket intake and ride plate. the ride plate has 2 washers in the rear and ironically it hooks up great in small chop and as soon as i hit CALM water the damn thing was all over the place. i had to trim it down and practically sit on the handlebars. my advice ride in rough water you wont notice since you will be holding on for dear life

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