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Knocking noise from top end

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Does anyone have a video of their 08 rmz they can link to see if mine sounds ok? Since ive bought it its made a knocking noise that a same year 250 does not make. Last time i had it apart i needed to adjust the valve clearances slightly but i still had the same noise. Cam chain is fine also.

When i got the bike the guy i bought it off assured me it was a new piston but u never know. I was thinking the sound was possible piston slap or do the engines give off a knock anyways?

thx

forgot to mention, filters always come out clean with no shavings.:smirk:

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