ORIGINAL: mrbigg
Nope, no dice with that one. Remember, I just bought this engine. The only way to start a "new to me" engine is to start it rich and lean it out from there. I leaned it to peak and back it off a little. Then started playing with the EPA.
Just got back from the garage and pulled the cowl. It's definitley past center now. I adjusted the pushrod so that I now have maximum travel at full throttle-the bellcrank is hitting the mechanical advance. This is way past center. I'll fire it up and see if I gain anymore RPM. I tried to get some pics but the butterfly is in too far.
Does this engine have throttle coupled mechanical spark advance? If so, that explains why you have more power when you over rotate the butterfly. More ignition advance.