Question about Yamaha YZ 125 Motorcycles

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YZ125 won't start

87 YZ125 won't start up. New top end at the begining of the season. It ran like a brand new bike for me one day and then it stopped starting. Could it be the crank seal? I'm not an expert on 2 strokes. It seems to be getting gas and it has spark. The carb was cleaned twice. I'm running out of ideas and may end up selling it or bringing it to a shop.

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Check the condition of the spark plug two strokes go thru plugs like no other. if a new plug does not help check to see if you are getting a bright blue spark at the plug while kicking it over. also make sure the fuel is fresh and is mixed with oil properly to much oil will foul out a plug fast if all else fails try a compression test it should be in the range of 130-150 psi.

Posted on Aug 09, 2009

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Yeah something you wanna check next, compression. if you can get your hands on a compression tester.

Posted on Aug 09, 2009

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