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Posted on Sep 13, 2009
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95 yz125 wont start. has new gas/mix, new plug

95 yz125 wont start. has new gas/mix, new plug gapped at .023, and good spark. if someone can tell me what the compression should be that would really help. thanks

  • rwhidby
    rwhidby Sep 13, 2009

    I didnt notice before, but no, the plugs really not wet after kicking it over 6 or 7 times. just today i pulled the carb. and cleaned it and the jets thouroghly. This all started when i was at the dunes, 4th gear, throttle pinned, the bike just sputtered and died. It hasn't started since no matter what i try. any help is GREATLY appreciated. Thanks

  • Anonymous May 11, 2010

    I can't help with the compression question, but are you positive the fuel is making it through the carburator and into the cylinder. If you kick it over 5 or 6 times and then pull the plug is it really wet?

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Arnie Burke

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  • Yamaha Master 7,339 Answers
  • Posted on Sep 13, 2009
Arnie Burke
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Call dealership and ask to speak to a tech-he can look it up for u --chec fuel delivery from tank to float bowl etc

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You mean start? Try putting proper gas/oil mix in it. Check for spark by pulling spark plug, ground metal case to engine metal and pull start cord. Look for spark in the plug's gap. If it sparks, you have a carburetor problem. Most likely gummed up with old gas. Needs to be removed and cleaned or replaced.
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Do you have fresh gas? If so is the mix right? If you can get to the carb easy spray some carb and choke cleaner in it. Check the gap on the new spark plug. The gap should be located somewhere in the manual. The big problem is making sure that the mix is right. To much oil in gas will foul plug smoke like crazy and foul the plug and hard to start. Not enough oil and you can seize it up.

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Sounds like the spark plug is not properly gapped.
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