Yamaha YZ 134 / 1

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Yamaha yz cylinder bore and nicasil coating 56mm = 134cc
Motocross
MX
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Hi man, nice project bike. I was rather surprised when i saw only one piston ring "slot" as im used to three from 4 strokes. and found many 2 strokes w two. Is it normal for "big bore" aftermarket pistons to only have one im guessing because of the friction benefits?

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