Question about 2008 KTM 250 XC

1 Answer

Time for a top end or jetting?

The bike doesnt start after its warm unless the choke is on. It doesnt idle very well at all. Air mixture screw is 1 and a half out. Idle is about the same 1 and a half out but doesnt seem to make a difference witht the idle screw. When riding if your ******* it on a straight away and then let off to set up for a turn the motor seems to surge (rev up and down a little). Im thinking top end needs replaced which im going to do anyway. What should a compression checker read if the top end is fresh? I live in ohio if that makes a difference with the jetting.

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  • mswartz602 Dec 16, 2008

    I tried that before the last race. I alway clean the air filter and tear off the subframe and take the air box out and blow it out. Maybe I missed some thing with the jets. Any Idea what a compression reading should be?

  • mswartz602 Dec 16, 2008

    Thanks man. Ill try it and let you know

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Sounds like the idle jet is cloged and u need to clean out the carb jets

Posted on Dec 16, 2008

  • chris madison
    chris madison Dec 16, 2008

    just saying that the choke bypases the idle circut in the carb (pilot jet) and u say it wont idle well at all, the idle screw isnt changing anything and when u let off after acel it leans way out it all screams fror the pilot jet and pasages to be cleaned, take it out and run a wire like from a wire wheel or brush through it everything u mensioned has the idle circut in comon

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