We do have a 40cc we are working on. 3lbs 5oz on CH EI. It has some decent power. APC 18x10 at 7500 brand new. But it has a tad more vibration than I can live with. I am waiting on a small scale so I can ballance the crank. I couldn't find one around here so off to ebay I went. I think that will take care of it. It should pick up some RPM once ballanced well. We can't have a paint shaker for an engine It is about 2 weeks out. It should be a good one once I get done with it.

Forgot to say, I do not have a clue on the weight of our 54 and 60. I should have weighed it before it went to the machine shop for a crank case. The guy machining them also made the crank cases for some of the BME engines. He is the man when it comes to CNC work.