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04 YZ 125 compression

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Hey, had this Yz for a little while now, was fooling around and when I crank the engine over I think I hear a little puff of air from the air box, would this cause low compression, how to fix? Thanks a lot...

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2 hours ago, Need some help said:

 

Hey, had this Yz for a little while now, was fooling around and when I crank the engine over I think I hear a little puff of air from the air box, would this cause low compression, how to fix? Thanks a lot...

 

Normal. the cylinder compresses and the crank case bottom compresses. True compression mus t be tested in one or two ways. cold engine, heated to temp engine. WOT and kicked through a few strokes with gauge in the sparky hole. 

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