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2010 KLX250S Stalling Problem!

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Hi guys,

I've got a problem with my 2010 KLX250S; It keeps stalling on idle! Now I'm sure it's something to do with the carb, I'm just a matter of finding out what.

The strange thing is, it doesn't kind of... Die out. It seems to idle okay, then bang, she just shuts off. Also, it seems that I have to give a slight bit of throttle when starting without the choke.

Bike has ~15,000Km (9,000 miles) on the clock. It's an Australian version (I believe the carb is slightly different?).

I've played with the mixture screw a bit. Like I said though, seems to idle okay usually. Side note - How the hell do you get to the thing without virtually removing the carb?!

Took the carb off and cleaned it out. No difference.

MODS! It has an FMF pipe and the airbox cover removed. I've also installed a Dynojet kit, which included a larger main jet (can't remember what I put in exactly), a new slide spring and needle. 

I haven't changed the pilot jet! I've heard going to a #48 can make a huge difference in starting. Maybe this would help?

Plug is relatively new.

The only other thing I haven't even looked at is the float height. Maybe it's set too low running out of fuel, or something? Thoughts?

I can upload a video if that will help. 


Any ideas would be greatly appreciated. Thanks in advance!
 

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Yah weird, is it idling at the correct speed?? Maybe try bumping the idle speed up a slight bit, then adjust the mixture screw as per normal. I find I need to increase idle while adjusting the air mixture to get the best results...possibly an intermittent electrical issue; kill switch, kick stand switch...good luck

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Got it sorted! Checked the fuel level in the bowl. It was filling a good 15mm above spec! Needless to say, this was the culprit. Couldn't figure out how to measure the float level properly, so I just winged it. Got it spot on. Eventually...

Chucked her back on the bike (my favorite part!), and it was definitely running better, but still not quite right.

Played with the mixture screw, and found the sweet spot at 4.5 turns out. WOW! Didn't know she could run so well! Starts easier that I could have imagined. Obviously I need a larger pilot jet, but I'm not too fussed about that at the moment. I suspected this was the case for a while.

Thanks for the help. Until Next time!...

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