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loud pop noise on 08 crf250r

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im new to Hondas.  When im checking my valve clearances im turning over my engine by hand to get it to tdc, and im hearing a loud popping noise and a sudden stop. Is this normal or do I need to tear down bike.  I just got it this evening and was going over it to see if it needed anything.

 

thanks drew

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If you have got you spark plug out it can just be the piston going in or out and pushing air out or sucking it it which can make that kind of noise. Don't take my word though

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I think it could be the auto decompressor clicking out of place. Makes sort of a clack sound.

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ok I thought that the auto dec could do it just wasn't sure. ive never heard it before

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