2004 Yamaha YZ 250 F Logo
Lloyd Wilson Posted on Oct 09, 2012
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Yamaha wr250f backfiring whislt starting - 2004 Yamaha YZ 250 F

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Jeff's Garage

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  • Expert 118 Answers
  • Posted on Oct 09, 2012
Jeff's Garage
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Has it been sitting? if so its going to need a carb clean, its just starving for fuel, also you might want to throw a new plug in it #CR8E and one more thing and this is a very common mistake, make sure the air filter is installed and has filter oil on it, believe it or not that filter and the oil thats supposed to be on it play a major role in the runability of that bike.

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