Hmmm, let's see, ok, it's a tight mill, with high compression, hard to turn over initially on a starter box, large displacement, high strung as far as tuning initially, very powerfull so hard to keep from stabbing it while doing on the road break in...
I ran mine in the rig but on a block of wood so the wheels were off the ground for two tanks then did the rest of the break in in the street doing big figure eights. Took about 8-9 tanks total, but by then I also had it tuned. Since then it has held it's tune fairly well, and I do not think I am getting it's all out of it. Worst part of break in was the first couple of starts on the starter box, and keeping it running. I still have fits getting it started on the box, but it is more the box and operator than the motor.