Ian, I don't know what Tosolini found out, but my 19t motor at the Novak Race was sick fast. I used full face 767's and red springs on both sides, broke in for 300 seconds at 2v. Purple springs tend to bog down the motor. I ran a 1.21" rollout. I qualified at the top of the C-main in 19t, but I didn't run qualifier 4 or the main, and I was in the B-main through most of qualifying.