I've got a K & B .61 and the only numbers I could find on it were on the left-hand side mounting flange, which are D0050041. I didn't have a lot of luck using the search here or the part numbers to find out more about this engine. It came in a 60" wingspan plane I got at a yard sale. It had a 12/6 prop on it, which sounds right for a slow heavy plane.
Can anyone point me to a place I can find out more about the engine, if parts are available, suitable for aircraft, etc. Thanks.