I broke mine in per my conversation with Bob at DLUSA. Run about 20oz through on the ground at different rpm's with cooldown time and tune it for good transition and reliable idle and go fly. I've never had any problems with my engine since was turning 6960 with a 3W 22x8 and 3 gallons later am using a Xoar sword 23x8 using mobil 1 2t @ 50:1, accelerates straight up at a little over 1/2 throttle on a 3DHS Katana.