We were riding hard for about half an hour, just quit after a couple of pops out the exhaust. won't start at first then started with choke, turned choke off then ran fine for about 5 min. pops again and quits,runs only with choke, load it on truck bring it home. starts up cold engine with choke then turn off choke runs good.Fiqure it's starving for gas plugged fuel filter or maybe vapor lock, any help would be appreciated.