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Engine noises on 05 yz 250f

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I have a 2005 yz 250f. Today I fired the bike up with the seat off and heard some chattering noise. I thought I might be piston chatter but im not sure. Thanks Blake

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I am hoping it is nothing serious. But I guess I won't know til I tear it down.

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How many hrs since rebuild? When I tore mine down, it was making noises, and the piston pin was loose in the piston and in the rod..... just saying it may be time. Also cam chain replacement time.

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It has a skid plate and has never been rebuilt. When I had the valves redone the guy working on it said it had a little bit of piston chatter so I think it's about time for a new piston anyways.

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And it does not sound like its in the motor. It really sounds like its in the carb.

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