I have a 91 MC21 SE, I just bought a used motor and installed it. After a few kicks the thing started up and was running. I shut it off and started again, and so on and so on. I felt confident that the bike would run so I decided to go to the gas station to fill up the tank with some premium gas. As I pull out the drive way, I forgot to open the fuel valve so the bike stutters and dies. Now I can't get the damn thing to start up again. What could be the problem. Any help/advise would be greatly appretiated.