There was a guy up at one of the tractor shows, up in PA, hadda tractor powered by like 6 or 9, or 13 maytag 1 lunger washing machine engines, Hadda walk around kick starting each one, IIRR...
I can see why he had to have two engines running backwards on the bike. if he didn't and cracked the throttle, it would probably toss him on his side!!