Most common cause for compression loss on a gt125r?

[Brian]

I have low compression, gt125r 2007 30000 miles on clock, 100 psi rear cylinder, what is the most common cause in these engines? If someone can help that would be great. Thank you

[Simon]

As with most engines it will be valves not adjusted right or not seating correctly, piston rings broken, stuck, head gasket leaking on worn bores the only way really is to strip down the top end of the engine.

 

 

[Jim]

Check valve clearances first!

[Author]

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