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Oil leaking from powervalve tube help


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My 2002 yz125 is leaking oil from the powervalve tube not a lot but it does drip pretty often.. I just have rebuilt the whole bottom end but bike also idols pretty high..any suggestions on what could be wrong? People are sayin new cranks could wear new crank seals

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That's normal for Yamaha 2 strokes. It's splooge coming out of the power valve, not trans oil. The transmission oil is in the gearbox, not the top end.

My 02 YZ 125 would drip a few drops after every ride, nothing to worry about.

Get your jetting dialed in, and switch to a clean burning 2 stroke oil like Amsoil (or a lot of others) and it will minimize it, but it will likely always do it a little.

Edited by poldies4
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