Hello,
I reversed the cylinder on my Weedeater 25cc blower engine. This provides greater room for different mufflers and much better cooling for the hot side of the cylinder. It required trimming back the fins behind the coil and trimming the case coil support a little for the carb flange clearance. Also the center baffles in the crankcase transfer ports had to be removed. They no longer lined up with the cylinder transfer baffles. It weights 55oz. without the muffler.

Dave