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03 yz250f

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I have a 2003 yz 250f, It will not start for anything. If i push start it, it fires right up, runs like crap. It back fires alot won't idle for anything. Could this be the valves?

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could be maybe the clearances are too tight, also check the fuel screw on the bottom of the carb. how many hours are on this bike?

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check your valve clearance. that sounds like bad gas, or tight valves. I'd bet valves if you havn't checked them yet

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if it backires my gues is your valves are too tight re shim!!!!

yeah, my friend was running real bad gas though once. it did the same thing.

but my guess is still for tight valves

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