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Please help with this leaky gasket yz250

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So I just replaced these gaskets the one on top which I think is the power valve housing does not leak but the flexible Rubber seal at the bottom of that housing seems to be leaking what smells like gas what kind of silicone sealant or any kind of sealant should I use to seal or this is 5 hours of riding trails pretty hard.

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Power valve linkage seal behind that could be leaking or the powervalve shaft seal .

That is more of a dust cover seal, no oil should be behind that rubber gasket. 

 

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