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I have a 2008 ktm 250sxf and I'm having a lot of problems with it. I missed yesterday's race because it wouldn't run right. It's idling really rough. Every few kicks it will back fire really loud when I get it to run it will idle rough and when I give it gas it will bog then when I release the gas it will rev high and is hard to come down. I will give it the smallest bit of throttle and it will stick at a really high idle and I have to rev it hard and quick a few times for it to come back down. When I put it in gear and try to ride it slowly it just tries to take off and it doesn't even feel like a high idle. I have to ride the front and rear breaks for it to not take off. I can let off the throttle and put it up to 6th gear and it still keeps going. I just had the entire top end replaced. Cylinder piston rings etc. I cleaned the carb several times cleaned all of the jets and still nothing. Replaced the throttle cable even disconnected it and still nothing. If I disconnect the throttle positioning sensor it runs a little better but is still pretty rough. I used a multimeter to test the tps and it seems fine other than when it's at "idle" it's at 1.14 on 20k I give it a little gas and it sticks at 1.17 until I rev it hard a few times. No idea what it could be. Needle and seat seem fine I'm stumped on it. Please help!

 

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check your intake booth between the head and the carb . 
 

+1 to checking the intake boot. They are very prone to splitting around the bottom.

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