Ok check this out was riding my dirt bike today propped it up against a tree cause i wanted to break and take my atv for a rip while i was away my friend had told me that the bike fell over and the carb hit off his helmet which was lying on the ground went to ride the bike again it started up and was reving up really bad and wouldnt shut down used the kill switch and that didnt work so i tried to turn off the gas then i touched the throttle and bam it shut down anyone know what it might be but now the bike wont even start up hope its not screwed up i just had the bikes top end and bottom end all done spent like 600 bucks on that hope its not blown up btw the engine was done over a week ago so i did go threw a few tanks of gas and i dont get on the bike cause im a beginner on a bike.