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  1. #1

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    Porpoising Problems, Need help!

    I just took my 2001 GP1200R out for the first time this season. since last year, i got an aftermarket intake grate, 13/19 solas impeller, performance pump cone, and a RIVA ride plate. Speed results were more than expected as i hit 68-70mph a few times on a stock engine. The only problem was the terrible porpoising even at 40mph. How can i fix this for somewhat cheap. I hear that shimming the trim tabs work. My ski had never porpoised before i put all of these mods on. HOw do i remove the trim tabs to shim them?


  2. #2
    Mik72e's Avatar
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    What Sponson you running.

    If your running the OEM step them that will fix your problems and if that doesn t then i would add washer under the Trim Tabs.

    Stepped Sponons is the way to go.

  3. #3
    WE DONT DIAL 911 RDH's Avatar
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    Quote Originally Posted by ksako270 View Post
    I just took my 2001 GP1200R out for the first time this season. since last year, i got an aftermarket intake grate, 13/19 solas impeller, performance pump cone, and a RIVA ride plate. Speed results were more than expected as i hit 68-70mph a few times on a stock engine. The only problem was the terrible porpoising even at 40mph. How can i fix this for somewhat cheap. I hear that shimming the trim tabs work. My ski had never porpoised before i put all of these mods on. HOw do i remove the trim tabs to shim them?

    the tabs are just 4 bolts....

    you should get a manual, it will have all these little things in it...

  4. #4
    Happily Self-Employed WFO's Avatar
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    step the sponsons

  5. #5

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    i have the stock sponsons set all the way up. they arent modded yet. Will stepping them really fix my problems? when i remove the trim tabs, do i use a wedge or somethin to break free the silicone?

  6. #6
    Step The Sponsons

  7. #7
    Mik72e's Avatar
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    You answered you own problem leave the tabs alone for now Step them sponsons

    Do a search for stepping sponson the best mod youy can do on a GPR

  8. #8
    Moderated
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    yep step those sponsons and the bounce will go away.

  9. #9
    Autosport's Avatar
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    from another Aussie

    STEP THE SPONSONS

  10. #10
    fenn's Avatar
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    def step the sponsons, its easy. front hole up and back hole down. drill out the center hole so its in the middle and leave the trim tabs alone

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