Blaster won't start,

it just died when one of my friend's was riding it , now it backfires every few kicks when i try to start it what do you think i should do next??

i got it started by pulling it with a truck and letting go of the clutch now it doesn't want to start again my friend says it died wile he was trying to do a wheelie :-/

i just tried to kickstart it and it only backfires, i pulled off the hose from the petcock and gas comes out so im confused

pleease help, im on the verge of putting it on craigslist for 200