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  1. #1

    Join Date
    Mar 2006
    Center of the Universe

    R and D Island Racing Modded Ride Plate Questions??

    I just bought a great running stock 01 GPR that was running solid 64's, I just got the plate with the skegs removed and its slower than stock and porpoises like mad. I also noted that the front of the plate bolts about 1/4 inch higher than the pump shoe.

    Is the trick to shim the back of the plate to keep it in the water or the front of the plate to keep it flush with the pump shoe?

    I had this problem with a Riva Ride plate years ago but it went away with a three degree nozzle and Riva Sponsons.


  2. #2
    You have to step the sponsons with these plates to prevent porpoising. Then you work on the plate angle from there, do a search, lots to read up on.

  3. #3
    philip_gpr's Avatar
    Join Date
    Dec 2005
    there are some suggestions on plate and trim tab settings here

    in addition to stepping the sponsons you might also try 1) shim the trim tabs down - try 2 medium size washers under all 8 bolts and 2) get rid of that step at the front of the rideplate

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