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  1. #1

    What would happen if these washers where left out?

    These washers WHERE NOT in my GPR when I took it apart!

  2. #2
    what you have pointed out are not washers they are clips/snap rings that hold in the wrist pin...
    what would happen, the wrist pin can slide to the end of the piston and rub the cylinder wall

  3. #3
    Duke's Avatar
    Join Date
    Jul 2006
    The arrows indicate the c-clips that hold the pin in place. It will result in catastrophic failure.

    If your talking about the shims (23) then it depends on what piston was used.

  4. #4
    ok, picture corrected: those are thrust washers... they take up the slack/space between the connecting rod and the piston where the wrist pin slides thru. prevents the wrist pin bearing from walking in the connecting rod, controls movement, acts like a bearing in a way between the 2 reciprocating parts. left out, it`s possible that it could wear down the wrist pin bearing...

    Duke> I have read where the thrust washers are used with Pro X pistons...

  5. #5
    Superman! fivespeedsteed's Avatar
    Join Date
    May 2010
    Midlothian VA
    theres still allot of slack in the stuff with those washers. wfo told me they werent that important, and that most pistons didnt come with them. my pro x pistons didnt come with them. id say if you using oem pistons use them if you use pro x dont worry about it, and if its some other piston try to use them for good measure. they have an orientation too.

  6. #6
    Happily Self-Employed WFO's Avatar
    Join Date
    Nov 2005
    Houston, Texas
    I recommend using the washers with oem and pro-x, but some other cheaper piston manufacturers say dont use them. A few of the old school racers dont use them.

  7. #7
    TX21's Avatar
    Join Date
    May 2007
    North Texas
    I put a motor together and forgot to put those back in... nothing happend to my motor.

  8. #8
    Thanks guys....

  9. #9

    Join Date
    Sep 2010
    Mine were left out and the work was performed by the Yamaha dealership a long time ago when it was still under warranty. Last month my middle cyl failed and i did the work myself and noticed it had been left out, so I guess its alright to leave it out

  10. #10
    What about if one of these washers is missing?

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