Hello I bought a used dirtbike of a guy the other day and when I got there he kicked it over in 4 kicks and started and ran fine. Then once I got it home me and my buddy couldn't get it to kick over. So we tryed to catch it in gear and it starts rite up and runs fine. So we went on a ride and like an hour in the bike just shut off on me and won't catch in gear again. I can't get it started. And I'm not sure what to check or what to do. Any help would be appreciated or any possible problems.