I bought this engine on a plane verry cheap with my Midwest Cap in mind, but I have no idea what it is to get a muffler or other parts for it should I need them. The engine ran pretty good on a short test run. The bore and stroke measure out roughly the same as a Zenoah G-38 or G-45. There is a large "E" "M" or "W" on the head and the only other markings on it are "cm10" on one crankcase half and "cm11" on the other and it has a prestolite coil and flywheel. The mount looks homemade. Thank you for your input.