well i went to the dunes and my quad ran really good at night going up thunder then the next day it was also running good made it all the way out to the end of the dunes and half of the way back but the problem is that at first when i was at devils dune(go do dunereview.com to see what i am talking about) and it would try and die but if i was going fast enough and played with the throttle it would fire back up but then on the way back i stoped to take a leak and i could not get it started again so i waited while they(my sister and her bf) went to go get a tow strap i was sitting in the shade and thought even though the kill swith doesnt work maybe there is some sand in it so i blew it out and played with some wires then kicked it and it fired up. so i drove out a ways then i just dies like it did out at deivls dune. so i call him up to tell him to come back and get me. and i wait a while see him flag him down then i decided to give it one last kick and it worked so i drove it back.i filled it up with gas and hit thunder a few more times then went out by the lake then i killed it to be a spotter at the top of a jump then it wouldnt start and i tried everything so we just had a griz tow me back to camp have any ideas what the problem is? sorry for it being so long it is either the petcock but i dont think so because the carb was getting gas or the kill switch