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Oil leaking into exhaust 450exc

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When bike is off on steep climbs or descents oil is filling exhaust is this a valve problem or ring issue?

thanks john

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Sounds like an intake valve stem seal. Not an expensive fix but kinda labor intensive because you have to pull the head off and the valves out. Depending on how much time the engine has on it and if it has ingested alot of dust, you would probably should check the valve stems and the guides.

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