Dirt Bike Repair & Maintenance Forum

so my kx250 is havin idle problems and it seems to have a high idle lingering once i let off the trottle. any ideas?  
05 kx263f

I assume you already tried adjusting the idle curcuit ie the idle screw if so
the first thing i would try is cleaning the carb out really good and spray out the pilot jet real good  
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ridin the dirt and the pow

you may need a new throttle cable or set the throttle cable correctly. or a new spring on the throttle cable.

to me it sounds like after you twist the throttle, the slide inside the carburater is not going all the way back down. so check those 3 things out.  
______________________________
Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80

good thaught elko  
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ridin the dirt and the pow

that might be it. last time i cleaned my throttle tube one of the cables was ent bad to one side and wouldnt go back i was like ehh whatev. maybe it snapped off all the way or thats the problem  
05 kx263f

iridekawi:
so my kx250 is havin idle problems and it seems to have a high idle lingering once i let off the trottle. any ideas?

Double check the rubber manifold between carb and cylinder for cracks etc and make sure the carb top is secure.  Your symptoms can also be caused by a small air leak some where as well or even too lean pilot jet or air screw setting.  
Dave H 2006 YZ250
(2008 YZ 125 son)

Hanging idle = lean pilot  
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Here we go again!

oaky. which way do you screw the air/fuel screw to make it richer?  
05 kx263f

skip i disagree with you on this one. if it was the pilot then wouldnt this problem always be there? but this only happening after the throttle is twisted. so that would mean that your still getting fuel through the pilot but because the slide isnt closeing all the way you are getting extra air past the slide, giving you a high idle.  
______________________________
Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80

no. even when i start it up with the chochoke on it idles high for a minute then the rpms just drop until it dies if you dont give it throttle  
05 kx263f

elko6:
skip i disagree with you on this one. if it was the pilot then wouldnt this problem always be there? but this only happening after the throttle is twisted. so that would mean that your still getting fuel through the pilot but because the slide isnt closeing all the way you are getting extra air past the slide, giving you a high idle.

Elk the only problem with your theory is taht all fourstroke have 2 throttle cables by law.  They work in a push-pull relationship because thumpers can create enough vacuum to keep the throotle from closing with just a spring.  If the vavle is gummed up it could stop it from fully closing but like the pilot jet it should be affecting all the time not just after twisting the throttle.  

I'm still thinking on this problem and will give my full opinion later.  Though I keep thinking along the same lines as Dave.  

Bill H. 2000 CR250R

well then you guys can handle this one because i thought the person said kx250 but their sig says kx263f so im confused.  
______________________________
Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80