Re: Does anyone recognize this engine?
Yup... from what I've read on these, they wouldn't run smoothly at all unless under load and at full throttle cutting into a log, These used a beval gear so the chain bar could be rotated to keep the engine upright since they didn't use a floatless carb. With the longer bars installed it took a second person on the other side to operate the saw. I'm sure someone could put a modern carb and do a little port tuning (or de tuning in this case) and have a really nice bike engine. More than a few of these type engines did end up on racing karts in the 60's and 70's because of their high power output.