yz250f problems

Discussion in '4-Stroke Discussion' started by billster14, Mar 17, 2010.



  1. billster14

    billster14 Rookie DRN Member

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    the nice weather made me want to take my yz250f out for a ride and it has been sitting in the cold in my shed since the end of the nice weather last year. when i put the bike away for the winter it ran great but now when i start it, it stalls unless im giving it throttle. i adjusted the idle and when it idles right and you give it gas it stays at high rpm for a long time before going back down to idle. it also doesn't ride well at low rpm's. it runs like a completely different bike and i dont like it i have no idea whats wrong got any suggestions?


  2. IndyMX

    IndyMX Subscriber

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    I'd take the carb off, remove the float bowl & accelerator pump and clean everything out.

    Make sure you blow compressed air thru the jets, just spraying carb cleaner on them isn't quite enough.

    Once you have it back on, readjust the idle & air screw and see how it runs.
  3. billster14

    billster14 Rookie DRN Member

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    could it still be a dirty carb if the engine was backfiring on deceleration?
  4. IndyMX

    IndyMX Subscriber

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    Yep.. sure could be.
  5. _JOE_

    _JOE_ Subscriber

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    Definately sounds like you need to clean the carb and drain all the old gas out. Fresh fuel and a clean, well adjusted carb should have it running like it did when you put it away.
  6. billster14

    billster14 Rookie DRN Member

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    nice thanks for the input guys ill let you know how it goes
  7. oldguy

    oldguy Always Broken

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    Also how cold out is it? You could be way lean and that would also cause backfiring on decel. Try adjusting the fuel screw out a half turn or so
  8. billster14

    billster14 Rookie DRN Member

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    It's not cold at all outside it's 60's I don't think that's the problem I'm taking the carb off today
  9. billster14

    billster14 Rookie DRN Member

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    Turns out i ajusted the fuel screw out a turn or two and it runs nice now. Thanks for you help guys
  10. ellandoh

    ellandoh dismount art student Mi. Trail Riders

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    :cool:
  11. oldguy

    oldguy Always Broken

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    If you turned it out more than 1 full turn then you need to re jet richer at least one step. Be carefull turning much more then that because you are on the edge of where it could now vibrate and loosen enough to fall out



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