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08 yz 125 with athena 125 kit

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I have a 2008 yz125 with the athena stock bore kit. Was wondering if anyone knew what the compression should be at roughly. It has about 3 hours on it since rebuild and seems to be getting way to easy to kick over.

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If it's any reference, my stock OEM cylinder 2010 YZ125 gets 180-185psi when freshly rebuilt / broken-in.

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2500ft and every yz125 I have owned was between 150psi &160psi.

Every compression gauge is different and altitude is also suppose to affect readings.

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A fresh 250 should be in the 200-220psi range, try another gauge perhaps yours is out of calibration.

 

Also change your procedure:

check with the engine warmed up to temp, hold the throttle wide open while kicking, about 10 kicks to get highest reading.

Edited by mlatour

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Thanks for tip. I'm new to the game. The 250 is all oem as far as I know I got it used with 23 hours on the clock it's a 2013 and just trying to figure out were they are at. I'll be doing that tonight on both of them. Thanks for the help guys.

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