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2006 CRF450r loud knocking

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I recently got my 450 rebuilt, got it back around last week. Today I was riding around and I suddenly noticed a loud knocking noise. I know the crfs tend to tick but this noise is very loud and noticeable its never made this noise before. All 4 valves replaced and also piston. So what could it be? No power loss or responsiveness lost just extremely loud knocking.

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First thing I would check would be the timing chain and tensioner to ensure it's working properly.

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