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2003 yz250f !

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2003 yz250f brand new bottom end, brand new top end, brand new 2010 yz250f carb with 2003 stock needle and jets, valves have been shimmed to specs. Now it will start and idle but when I hit the gas it bogs really bad and if I get it out of the bog it will rev great but then I have a hanging idle. I have gone leaner and rich on the pilot and turned the mixture screw in every position possible. Some times its hard to start I haven't replaced the stator but that wouldn't cause a hanging idle. Am I missing something here.

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Check the idle screw and throttle cable. If idle screw is too far open it will cause the revs to hang. Also, if the throttle cable is too tight, revs will hang. 

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