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Thread: Ride plate help

  1. #1
    Huh? Dyoung's Avatar
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    Ride plate help

    Alright ...I installed the riva open loop plate and tested it last week and found that the ski would porpoise severely every time that I would try a speed run....I removed my pump wedge and retested with better results but the ski is not doing what it should..i'm a fairly experienced rider and have tried every little trick that I know of to keep the ski in the water as far as riding style goes.No matter what I do it still porpoises when near top speed......The intake grate is perfectly flush with the plate... I have read in other threads that shimming the rear of the plate may help,but I have not been able to find a measurement on the size of the shims that seems logical ...any help or opinions would be greatly appreciated....thanks....mods in sig


  2. #2
    Moderator Snoman's Avatar
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    You can start with a .010" shim and work upwards to a .020"/.030".

  3. #3
    Huh? Dyoung's Avatar
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    rideplate help

    Quote Originally Posted by Snoman View Post
    You can start with a .010" shim and work upwards to a .020"/.030".
    that's what i was looking for...it was said in another thread to shim ".20" that's almost a 1/4 inch..I thought that was a little extreme...thanks snoman

  4. #4
    KC Blue Thunder's Avatar
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    I installed the RE blockoffs... that did for me. Before it would start porposing above 75. Now shes steady. The blockoffs that you installed were they the Fiberglass ones that are now out of production? If so they should have fixed this problem. Shimming would be the next route then like Scott said.

  5. #5
    Huh? Dyoung's Avatar
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    rideplate help

    Quote Originally Posted by Blue Thunder View Post
    I installed the RE blockoffs... that did for me. Before it would start porposing above 75. Now shes steady.

    yeah I have the fiberglass b/o installed....speedskixp told me to try removing the wedge and it did help....but it still porpoises to the point where my buddy with all the same mods except he's running an unmodified stock ride plate will creep by me because i can't stay hooked up.......will stainless washers that have been measured with a micrometer work?

  6. #6
    Moderator Snoman's Avatar
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    Quote Originally Posted by Dyoung View Post
    will stainless washers that have been measured with a micrometer work?



    Yes they will...

  7. #7
    Huh? Dyoung's Avatar
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    rideplate help

    Quote Originally Posted by Snoman View Post
    Yes they will...
    Sweet, I'll give this a try and report back.....thanks guys

  8. #8
    Huh? Dyoung's Avatar
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    Update

    okay, I've been on the hunt for some stainless washers to shim the rideplate with and so far the thinnest i've found is.045..thats just under the thickness of a dime.....is .045 too drastic ?...I have some brass shim stock that's .012...I guess i could double that up...any suggestions?

  9. #9
    Moderator Snoman's Avatar
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    Brass might be to soft..You might smash them when tightening the bolts.....Did you tr MC Master Carr??I know they have all kinds of shims..thats were i plan on getting mine..

  10. #10
    Gone in 3.0 seconds... RXPT400's Avatar
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    at what position do you have your trim motor set-up for when you do your testing???...what sponsons do you have install on the ski???...you mentioned that you are running the riva open loop with the plate. My questions is : Is the ride plate flush with the bottom of the hull or it is sticking in a little ??...all these things affect your problem make sure you have them check out....

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