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2006 CRF250 Engine noise

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I just bought a 06 crf250. When the bike is off and I kick down the kick started easy I hear the motor make a noise. Sounds like the piston maybe hitting something. Not a grind just a knock at a certain point of the stroke. Do these bikes make a noise when they hit top dead center? This is my first 4 stroke. I know 2 strokes dont make this noise. The bike runs good as hell and has good compression. I'm a pretty fast rider and the bike holds up good at the track so far so the motor seems to be in good condition. What do you think it is? I'm going to rebuild the bike soon anyway I was just currious if anyone knew.

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