This thing has beat me. A little history, I traded for the bike with the problem. The top end has new timing chain, stock piston and rings, cams and exh valves. New head and cyl have around 25 hours on them (head and valves good I check everything). I got the bike from a friend so I know the history since it was new. The bike was running fine and my friend was just running the valves and thought now would be a good time to freshen up the top end. From that moment on the bike will not start by the kick starter. I have gone over all the stickies on the web site and didn't find any that match the problem I have with this bike so here I am looking for an ideal to chase. The bike has been tore down 5 times. I can not find anything wrong. I got fed up and drag the bike and it busted off with in 20 feet and runs strong. I have put close to 3 hours of riding on it with no trouble at all (just don't fall down), but it won't start with the kick starter. I started chaseing electrical and every thing check fine, so I replaced the CDI box and wiring harness (had a wire that tested bad when you moved the bars left to right), didn't fix it. I have taken all the hot rod crap off and the bike is back stock with a JD jet kit. The one thing that I keep thinking about is the exh cam. The timing is dead on, but the cam lobes just don't look right. They seem to be retarded one tooth, but the cam marks are dead on with the head. Intake cam look good, but the exh cam lobes just look a little wrong. Has anyone replaced a stock OEM cam and the sproket was just off? One more thing that got me to thinking the problem is in the exh cam is, with the I mark on the fylwheel lined up and the cam on the marks the auto decompression mechanism does lay on the bucket. I keep thinking about the auto decomp, you can kick the bike and it will backfire every time, so I have to be getting fire while the exh valve is cracked open. But as I said the timing is good. I need some ideals to chase or this bike is going to hang on the wall of shame. Not realy I do need some help, I gave this bike to a young man just starting out and I can't give up. Thanks for any advise.