RE: O.S. .46 engine problem
Yeah, that might do it. Sounds to me like you're rich, but without actually hearing it I couldn't say for sure. Am getting aquainted with it's son, the AX, and will say if that engine is on the rich side, it will definetly hesitate from idle to full throttle. And you do want to wait untill you get it good and broke in before you lean it all the way out, and then and only then can you really set up your idle.
Andy