Question about Yamaha YZ 125 Motorcycles

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Whilst riding at long periods at high speed my bike just shut down and didnt seem to have compression once i went to kick start it again.yz 125

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  • Yamaha Master
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It sounds like you cooked her. If you are jetted lean, and run it wide open for a long period of time, it melts the ring to the piston.
Do a compression test, remove spark plug, thread in gauge, and hold throttle wide open and kick untill the guage stops climbing (Around ten or so) Less than 100 psi is bad.

Posted on Jul 13, 2009

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  • If a hole in the piston then install new piston and rings. Next, clean the carbon off the head and install a new head gasket.
  • If cylinder wall is scared the piston has seized up. Pull the cylinder off and take it to the dealer. Have them bore the cylinder and return it along with a new oversize piston and rings.
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Please rate the solution as a "FixYa" if able. Thanks!

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