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Yamaha MX & Off-Road Dirt Bikes
2002 YZ250 leaking oil
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[QUOTE="rmc_olderthandirt, post: 1343336, member: 68872"] It is premix oil. Half burnt premix oil. It is common for a 2 stroke to have the black oil residue dripping out of various spots of the exhaust system. The obvious spot is out the exhaust at the silencer but they can also leak at the joint between the silencer/pipe and pipe to cylinder. The power valve gets drenched in this goo and can leak out the seals on either side of the cylinder. Like AV8R said, what you describe sounds like the dust cover over the linkage to the power valve. I wouldn't tear the engine apart to fix that as it won't really hurt anything but the next time you are doing a top end you should consider changing the seals on the power valve. Rod [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
2002 YZ250 leaking oil
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