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  1. #1
    GPR@80+'s Avatar
    Join Date
    Oct 2006
    Augusta Georgia

    How to Eliminate topend Hop at Peak Speed?

    I am new to this forum, but not new at top speed runs. No one in my area races anymore. I met Kerri back when he and my arch rival Billy Morris were racing Ultras.

    I have never figured out how to get the topend leap out of my GPR1200. It does it at 79 or 82.5. Tim Judge years ago was tuning Riva's boat at 87.5 and he could not give me an answer. Has time cured this issue? How is it dealt with by the fast GPRs riders of this forum.

  2. #2
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    League City, Texas
    Welcome to the Forum

  3. #3

    Join Date
    Dec 2005

    what trim tabs do you use?

    have they been shimmed at all?

    most people solve this problem 2 ways

    - the step the stock sponsons - mount them so they angle up at the front

    - shim the Riva or R&D trim tabs down anywhere from 2 to 4 mm

    This stuff is talked about in detail here:

  4. #4
    GPR@80+'s Avatar
    Join Date
    Oct 2006
    Augusta Georgia
    I am using R&D: Single grate, ride plate with stock tabs. Ron Allison, a friend from Tenn. told me to grind the topside of the ride plate at the rear to tuck it under tighter for more speed, it did not work for me. I went back to all stock R&D stuff. R&D tabs I discarded for stock.

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