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I'm in the middle of rebuilding the engine on my yz 134 but im not sure if I need a new piston? it has scratches down the sides, not sure if that's a problem.
the marks on the piston indicate forein material in the top end, likely the brass thrust washers failing in the bottom end. the rod bearing is most likely shot. would i reuse the piston? if the MEASUREMENTS were within spec i would with a new ring. and find the source of the unidentified stuff floating around inside.
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