Tached the engine today... it's breaking in nicely. Set my idle comfortably at 1640 now and top end was 8850. I got the idle down a little more but was comfortable with what I had. Using 15% Wildcat (80/20 mix) and OS F plug. With a 460cc tank, I estimate flight times to be in the 13-14 min range. I flew 10 min and had enough for a few more minutes.