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05 yz125 low compression

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Just bought an 05 yz125 with a new cylinder and piston, but has major low compression ( push through stroke with just pinky) and only starts being bump started. Any info welcome

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Just bought an 05 yz125 with a new cylinder and piston, but has major low compression ( push through stroke with just pinky) and only starts being bump started. Any info welcome

sounds like whoever did the top end last screwed up. I would pull the cylinder, or atleast the head and take a look at the piston. 

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Yeah I was planning on doing that, checking the reeds, and make sure everything is torqued down to spec. What else could it be? Crank seals as a posibility?

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