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crf250r CRF250r stutters and dies when hot

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I have a 2007 CRF250R, and when the bike first starts up it runs perfectly. Absolutely zero issues, but around 15 minutes into riding, the bike stutters a bit and stalls when given a small amount of throttle. It still runs well in the high end, its just the low end that is giving me trouble. Any help is greatly appreciated. Thank you

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i checked the carb out today but when i checked the fuel screw it was missing the spring that keeps tension on it so that it doesnt back out of place. i dont know if that could have contributed to the issue but to be safe i ordered a quick adjustment fuel screw and hopefully this will sort everything out.

 

 

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Update, the screw helped some but the problem is still there. When its cold, runs perfect. When it warms up, like crap. But only in the low end. High end is just fine

 

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