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  1. #1

    Join Date
    Jun 2010
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    Washers on piston rod (Yamaha1200 XLT 01)

    Hi,I have only one piston with washers on the both side of the bearing. Other two piston don't, is it OK to proceed rebuilding without washers?



  2. #2

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    Aug 2006
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    I believe its best to have both washers to reduce wear on the inside of the piston, some guys think they are un-necessary, but then why did the factory waste their money on them? They also help keep the wrist bearings centered in the rod, so they do not walk out to either side.

  3. #3
    Happily Self-Employed WFO's Avatar
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    some piston manuf recommend running without them, like WSM and SBT

  4. #4

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    ok so.., chicken or egg??

  5. #5

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    SBT 1200PV and 1300PV piston kits come with the washers. Just installed one in a repair job. I can see how a aftermarket manufacturer could make their pistons to not require them though by having a different spec for pin clearance width.

  6. #6
    If the ones without washers are from SBT for a 1200 non PV they will likely NOT have washers. I don't know if SBT has changed spec on theirs recently or not but washers do not belong on the two I just replaced. They wouldn't fit if you tried to (I did try ha!).

  7. #7
    yankejr's Avatar
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    Sbt pistons for the 1200 pv motor, have a more clearance between the piston and the connecting rod. So much more that I used the washers that came with the pistons and the factory washers from the old pistons, and there is still more rod to piston clearance than stock oem piston. I was concerned about the bearing walking to one side or the other and having less contact surface in the rod, dont know if that would have been a problem or not.

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