Most common cause for compression loss on a gt125r?

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This topic has 2 replies, 2 voices, and was last updated 2 years ago by Jim.

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- Oct 4, 2024 at 9:09 AM #15046
  
  Brian
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  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
- Oct 4, 2024 at 1:27 PM #15047
  
  Simon
  Participant
  
  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.
- Oct 22, 2024 at 11:35 PM #15293
  
  Jim
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  Check valve clearances first!
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FORUM ARCHIVE: Boards are now read-only as archives. For bike service manual downloads, parts shop, or to read more about the forum changes, tap here to read more....

This topic has 2 replies, 2 voices, and was last updated 2 years ago by Jim.

Viewing 2 reply threads

Author

Posts
- Oct 4, 2024 at 9:09 AM #15046
  
  Brian
  Participant
  
  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
- Oct 4, 2024 at 1:27 PM #15047
  
  Simon
  Participant
  
  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.
- Oct 22, 2024 at 11:35 PM #15293
  
  Jim
  Participant
  
  Check valve clearances first!
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