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  1. #1

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    yamaha fzs porpoising

    just wondering whats the best way to reduce porpoising on my yamaha fzs 2010 at around 80mph it has an r&d intake grate & ride plate shimed 1 washer (on rear of plate)2 shimes seems to dig the front down 2 much (loose speed)and still porpoises on any trim setting on the handle bars,i ride on a very smooth river most of the time,any idea,s???


  2. #2
    YoYamma's Avatar
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    Is that the factory ride plate or aftermarket plate?

  3. #3
    AWA MEMBER
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    Quote Originally Posted by YoYamma View Post
    Is that the factory ride plate or aftermarket plate?


    I read it like he has a R&D plate....but then again he could be sayin he shimmed the stock plate.....hummmmm

    ---------- Post added at 05:57 PM ---------- Previous post was at 05:54 PM ----------

    Can't he try a VX plate on that? I thought I read somewhere you did that?

  4. #4

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    it has a r&d ride plate and intake grate thanks guys

  5. #5
    Addicted Member 5001craig's Avatar
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    Welcome to the forum.

    Haven't used the R&D plate but maybe try a different plate for your type of riding. Or maybe try a thinner shim--basically try 1-1/2 of what you have now. Shims of different thicknesses are available from Mcmaster Carr.

  6. #6
    64physhy's Avatar
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    I'm running the R&D plate with the spacers off the stock plate, and haven't noticed any porpoising. I've only had it out once since changing the plates, but part of it was on smooth water, and some on choppy water with a lot of WOT riding and no porpoising.

  7. #7
    gleson's Avatar
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    Quote Originally Posted by 64physhy View Post
    I'm running the R&D plate with the spacers off the stock plate, and haven't noticed any porpoising. I've only had it out once since changing the plates, but part of it was on smooth water, and some on choppy water with a lot of WOT riding and no porpoising.
    What speeds are you seeing, I waws thinking of a similar sort of setup.

  8. #8

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    running around the 80mph range the ski has motec,watson racing intercooler,14psi charger wheel,air intake sleeve,air filter,riva exaust,skat trax 13/24 impeller,works sponsons,r&d ride plate,and r&d intake grate,and watson racing cooling system,it just porposies from say 70mph up,its worse with no shims in the ride plate,but the ski feels a little wobbly at big speeds with 2 shims in the ride plate to me.also i ride on a river that is usually dead flat like glass

  9. #9
    64physhy's Avatar
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    Before adding the ride plate and prop, I hit 71.1 GPS. I didn't get a GPS speed with the plate and prop, but there was a very noticeable difference in speed. The stock speedo shows about 5 MPH faster, so I'm guessing I picked up 2-3.

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