RS43Drifter done it one tme aswell, there was a thread about it not to long ago. Somethign about the piston being TDC and it fires happenign to go the wrong way. We had it figured out untill Sky gave us the smarty pants answer, lol
I didnt belive this till I did it myself, I had my storm on a picnic table last week, I had just put new brake pads on it, and was firing it up for the first time in a while. I was just giving it short throttle bursts and it died, fired it again , started giving it throttle and it flew of the table backwards. It hit the ground and died,hasnt done it since, Weird!
These engines can run backwards. It is a rare occurance and tends to be short lived. While it can do it, it is not designed to and typically stalls out pretty quick.