Thanks Antique. I thought that's what it was but was confused by the carb being on the opposite side from pictures of other Q50's. However, after doing some more digging and reading, I found out that the cylinder was reversible on that engine and, after examining mine more closely, saw that one of the coil-mount lugs on one side of the engine was broken off.......probably the result of a crash and probably the reason the cylinder on mine is rotated 180 deg. This engine has coil-mount lugs on both sides of the engine and almost certainly the reason it had been rotated.