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Kxf250 bad idle

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Just recently got a 09 kx250f I rode it about 12 hours and out of no where there bike started running really bad, a lot of back firing and really bad idle. I took it for a ride and when ever I let off the gas it would rev really high even though I wasn't hitting the gas. I immediately shut it off after I noticed that happening and the bike wouldn't start after.  After that ride the bike is very hard to start up now, and when it does start I have to keep on the gas because it will instantly die if I let it idle. I got a new fuel screw and been messing with it but that didn't seem to help really yet but I haven't had a lot of time to adjust it yet. Any other ideas what might cause this? 

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Sounds like you might have some junk in the pilot jet. I would pull the carb and clean all the jets.

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Seconding a carb clean
Assuming you have gas in the tank haha the symptoms sound like your not getting fuel to the engine

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