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vacume leaks

  1. power valve vacume leak

    I have a 1985 yz250 with a 1983 yz 250 engine. i just rebuilt the hole engine. I am having ideling *and hard start problems. The bike has a small idle surge at times and it does not want to stay running all the time at idle. i adjust the idle and its ok for awhile then it changes again. the carb...