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2002 RM 250 Power Valve Rattle?

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My buddy has a very low hour 2002 rm 250. Just put a new tip end in it. As it was getting low on compression and had a "rattle". New top end , power is up but rattle is still there at low rpm? Goes away or can't hear it when speeds and rpm go up? My buddy is convinced it is something to do with the powervalve. Is this a "thing" with the 2002? Bike runs great otherwise and has no odd vibration that we can notice.

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First thing to do is to make sure it is not the exhaust pipe springs rattling on the pipe.

The power valve on these RM's does have some level of noise that most people do notice. If you really think that is the cause and it sounds excessive you just gotta take it apart and inspect for wear and smooth operation.

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