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  1. #1

    2007 250X not running right

    We have a 2007 250x with 55 hours on it. Before the top speed via speedo was 70, and now we are lucky to get 60mph out of it. Normally if we do a donut or such it wouldn't hesitate at all but now it seems to be hesitating and misfiring.

    Normally a simple plug change will fix this as it has in the past but this year it is kicking us left and right.....

    Any insight would be helpful!

    Thanks!


  2. #2
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    speedo doesnt mean crap in this situation... what are the rpm's and what kind of boost are you making?

  3. #3
    Boost has been staying right around 13-15lbs. Believe the RPM's are staying around 7700ish. Can't exactly remember the RPM's.

  4. #4
    Also wanted to say that we are running a NGK CR9EB plug for it.

  5. #5
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    did you gap the plugs to spec?

    might have a loose hose clamp on one of the boost tubes

  6. #6
    I'll take a look. We are wanting to check the fuel filter and air filter. Not exactly sure where either one of these are at. Looking at a manual one of them says to remove the engine!?

  7. #7
    nicjak's Avatar
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    it has no air filter rpms seem right to me boost is more than stock so you only have a misfire sounds electrical check all connections and plugs again. doubt it to be fuel filter unless you have really put some dirty shit in there. sure its not cavitation or slipping belt?

  8. #8
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    put a set of the OEM PMR9b's in and see if you still have the problem

  9. #9
    Took the ski out today, RPM's are right at 7680-7720 *7720 if you are lucky*

    Ordered a set of the OEM plugs for it, just waiting on them to come in.

  10. #10
    nicjak's Avatar
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    as said your rpms seem normal

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