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whats the deal with my valves

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i just bought an 04 kx250f. it ran great for a bit but eventually had no compression. i checked the valves and had to change one. after that it ran great again for a while until it started doing it again. :thumbsup: why are my valves wearing out so often?

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I'm assuming by change you mean you had to shim one? How many hours until it "started doing it again"? Time for new valves?

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