I had it replated with nikaseal and a put a fresh top end in it. It also has a new boyeson reed cage. I am running a br8, but have tried a br9. It always ran fine for several hours, then I'd let it sit for a day, or several hours, then try it again and it would backfire, and run like crap, then die. When it was running right, it would start with one kick cold, so I think everything else on the bike is fine except something with the ignition.