Very nice! I bought one of those engines cheap on ebay (used), only to find that the piston had cracked and flaked off by the ring land. I did find a short block for cheap so I have a working engine and a spare short block.. I did discover that these engines have an actual cast iron liner in them - I bored the broken piston cylinder out .035" oversize. I still have to find a piston to fit or machine one. Nice to hear that it can actually swing a prop!

When you put a bigger carb on yours, did you open up the intake port? I noticed on mine that with a ~10.7mm intake port, a carb much larger than 11mm didn't seem to make much sense. Even the 9.5mm (venturi) carb I have has a larger throttle bore than the port.<br type="_moz" />