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06 KX250F not running when warm... HELP

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So,

my 250f will start when the engine is cold, but even with the idle cranked up it will only run for 2 minutes maximum and just die. After it dies, I can't get it started by kicking or pushing it. The only way I can get it started is to let it sit for a few hours to get cold again.

I have cleaned all the jets in the carb and replaced some parts that looked worn. I have checked valve clearance, and its within specs. My exhaust pipe is clear. I have good compression. I don't know what else it could be... It makes no sense that it runs when cold (not well) but then just dies and I can't get anything out of it.

I am out of idea, and really don't want to take the top end off just yet.

Any Ideas???

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