I have a 2006 Vulcan 750. The bike runs great for 30 to 40 minutes then stalls. When I try to start it, it seems like the battery is dead. After letting the bike cool down for about 15 minutes, it usually starts again. At first I thought it was a carburator problem. I had them professionally cleaned and syncronized. I replaced the battery twice.I'm stumped at this point. If anyone has any suggestions before I take it to the dealer and spend an arm and a leg, I would really appreciate your input.