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post #1 of 3 Old 06-30-2013, 08:45 AM Thread Starter
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Exclamation Having Trouble :(

here goes....so...I took the air intake box cover off to let the bike breath more. While riding I notice that the bike seems to "lag" or lose power when I get on the throttle. After riding for about 10 minutes the bike REALLY starts to lose power even when I wasn't getting on the throttle so hard. Finally I lose all throttle response and the bike dies. I push the bike home, put the box cover back on and she starts right up, idles fine, revs fine. Hop on and take off, 2 minutes into the ride it does the same stuff. So I turn her off, let it sit for 10 then turn her on and head back to the house. Bike chokes up and dies again after a couple minutes... Called it a night after i got home. Came out today and let her warm up for like 4-5 minutes. Took her down the road, not even half a mile later , while im down shifting, she dies. Wont start again without messing with the choke. Soon as i push the choke in it dies again. Pushed her home and now im stuck....Thoughts?
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post #2 of 3 Old 06-30-2013, 08:47 AM Thread Starter
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2010 kawasaki KLX250SF supermoto, half a tank of gas, clean air filter, 1600 miles on it
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post #3 of 3 Old 07-01-2013, 08:46 PM
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Location: Cadiz, KY USA
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Sounds like your fuel tank isn't venting; starving the carb for fuel...

It's just a guess, but a quick test would be to trap a McDonald's (hollow) coffee stirrer in your gas cap as you close it... This will allow a bit of "breathing"... Then go for a ride (not off-road, as this makeshift vent could possibly leak a bit)...

IF that fixes it, then check the gas cap vent... I'm not sure where the venting is on the KLX's gas cap assembly, but this "field expedient" check should tell you if that's what it is...

Just my $.02...

I can explain it to you, but I can't understand it for you.
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