Just wanted to give some feedback on the D5, I started the breakin today. The first tank I just idled very rich just to clean out anything that was in the motor from manufacturer and it purred flawless. Then began the varies tanks of fuel slowly getting to that full throttle position and no problem not even one flameout. At the 7-8 tank the motor became very smooth and started showing off its powerband (hard to believe its not modded), I believe is better then my Alpha green head. I'm very impressed with this combo the temps never exceeded 240 and down here its very humid and hot (98). Looking forward to racing this motor next weekend and so far this combo is definitely a great bang for the buck.