Charley, I'm no engineer, and Jack Chance was a far better mechanic than I ever will be. I overhauled mine once and it was easy to work on. I have a great respect for the rotary design and am sorry they are not in more wide use, but I have no clue how to come up with the kind of stuff John did on crankshafts and all the other stuff they did. I'm just grateful I got to watch the rotaries race two different times. Regretfully I don't have photos of the first time.