The engine just shut off while i was riding today for no reason at all, i pulled over to an adjacent parking lot and yanked the plug to see if i had spark and I did. no problem there. i checked to make sure the fuel was flowing, it was flowing fine. i checked the wiring to make sure the kill switch isn't being activated, no problem there. I always carry a minumum of three extra plugs with me as a precaution, all NGK quality, and they all had a good spark. I tried each plug to no avail, only one plug the NGK-B6HS R worked and when it did it took me for about 15 seconds then the engine bogged down BADLY and shut off. After that i spent three hours on the road _far_ from home trying to get the useless machine to start. The plugs were all working fine but when i screwed them in there was NO popping sound whatsoever to give me an indication that the engine was even trying to start. The first hour i tried to start it I noticed that the decompressor valve was leaking, even when closed. I didn't think this was a problem at first become my decompressor valve is always leaking at the bike always starts no matter what. The second hour I got multiple backfirings and surprisingly, a few misfires, then it just quit for good. The decompressor is adjusted perfectly as to manufacturers specifications and is in the same shape as when i was riding it at 40mph yesterday and i haven't touched anything since then so what the hell?