It sounds like a cylinder was completely locked with fuel. If the engine wouldn't turn ANY - ZERO ROTATION - then the rod wouldn't bend. It also won't bend while running; it'll only bend when the engine has turned enough to get some inertia and then the piston suddenly stops. The fact that it sat for 15 minutes then started means the fuel bled past the rings into the crankcase. You need to change the oil NOW and do a hydrolock rod test... unless you just don't want to know
Steve
Whew, Tragedy narrowly averted!

Thank you to ALL who helped with my education on hydrolock. If I never utter that word again it would be too soon!! Ill be performing all the recommended procedures to ensure it never happens again! As for now I'll have to wait since I just blew my budget on the bike, Insurance, registration, transfer fee's, a new helmet, not to mention two teen's attending school here in California. I'm tapped for the next few months! I'm going to cringe now every time I press the starter button until I can get the carb work and the tube kit!! I'll just have to keep a close watch on the petcock, making sure it functions properly, until then.
Steve, I'm also interested In the two minute mod and the exhaust cam kit. It looks like you've made some great innovations and come Highly recommended in the forum!
Well, gotta scrape up some change and go buy some epoxy to repair the loose seam on the air box front bottom corner. Then, short of any other parking lot operator errors, I gotta go RIDE!

Thanks Again!