Question about 2003 Yamaha YZ 250 F

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Hard to start yz250 dirt bike 2001 4stroke

Sometimes it bum starts .sometimes 25 kicks.one time i cleaned carb and put new fuel in started in 2 kicks only to go back to hard starting at riding area.bought it used seems stock.seems to have lots of compresion and when it does start it runs perfect.ihave killed a new set of boots in one summer

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  • Anonymous Mar 16, 2014

    I can take the breather loose from back of carb and it will start when cold . After it warms up it starts on first kick and runs great.

  • Anonymous Mar 23, 2014

    I bought the bike with the carbs of .what i cant tell i order the factory boots and a new set of carbs .when i try to put the set on it wont go on the head.its like the boots are too small ?

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I used to own a yz426f and it had the exact problem... a fresh plug will fix your problem. change the plug and the bike will run great. also don't start the bike and shut it off , my bike would be fine if i started it and rode for a while getting to the proper heat range help save the plug. if my bike didn't start in one or two kicks it was usually the plug.



hope this helps

Posted on Apr 05, 2009

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