.56 mounted on Twist, was just about the easiest swap I've ever done. Throttle linkage wasn't even an issue, just had to turn the carb around. Engine is pulling 9600 rpm with an APC 13x4, and about 10,900 with a 12.25x3.75. Will try and fly with both, hopefully tomorrow, and will drop flight report when I get it. I really like the throttle response already... but we'll see when it gets in the air.


Andy