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  1. #1

    Join Date
    Oct 2011
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    Lawrenceburg, IN
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    Installing New ProX Pistons Advice/Experience Needed

    I just received my new Pro x Pistons and wrist pins... The wrist pin bearings are WSM and there are no thrust washers with the bearings. It seems a little sloppy in there. I tried putting the old thrust washers from the sbt pistons I took out and they will not fit.

    Does Pro X not use the the thrust washers?

    Thanks guys...


  2. #2

    Join Date
    Oct 2011
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    I have searched and read other threads and some say do.. some say don't... 65U no, PV motor yes... Sorry to post the same question but the answers I found were confusing...

  3. #3

    Join Date
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    Quote Originally Posted by bdebruler View Post
    I just received my new Pro x Pistons and wrist pins... The wrist pin bearings are WSM and there are no thrust washers with the bearings. It seems a little sloppy in there. I tried putting the old thrust washers from the sbt pistons I took out and they will not fit.

    Does Pro X not use the the thrust washers?

    Thanks guys...
    It will work fine without washers.

  4. #4
    Agreed
    no aftermarket for these uses the thrust washers from what I have seen

  5. #5

    Join Date
    Oct 2011
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    Lawrenceburg, IN
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    Thanks guys... Seemed a little loose... Can't wait to get this thing back together. Cylinders are at the machine shop today... New top end= fun for the summer....

  6. #6
    Yamaha artisan Cutlass's Avatar
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    ProX piston are pretty much the same thing as OEM so if you really wanted to, I bet the OEM thrust washers would fit/work. I can't remember for sure but I think I reused my OEM washers when I put my ProX pistons in mine.

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