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08 yz 250 want to fire up but wont.

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i was at the track yesterday and the bike stalled and now it wont fire up. i changed the plug but still nothing. any ideas?

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Any spark? And if so, is it good, consistent spark? Dark room should allow you to see. Use of a timing light also will show if it has irregular firing; just point the timing light at the wall in a darkish room and kick it over.

I take it you have compression, checked all wiring, wiring connections, said you already changed plug, no water where it shouldn't be, made sure carb isn't clogged, etc: all the simple stuff. Magneto rotor key not spun? (timing ends up in wrong place, but has good spark)

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yea its got a good spark. im about to clean the carb. apreciate it man.

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did it stall while idling, or while wringing its neck or at any sustained throttle position?

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no i was just going through a corner and got bogged in the rut and she stalled out on me.

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When was the last time the top end was serviced?

kinda sounds like today. stalling out under power is never a good thing.

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it was the killswitch. seized up but i got a new one and she runs like a champ now

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