Break in complete, took off the big fins and replaced with standard norvell head and plug, had a time figuring prop screw, ends up it is a 5-40 like the cox motors,most norvells are 3mm. Ran in at 17,200 on a 6x3 prop and finished up at 20,500 on a 5x3 . Runs Great, sweet deal. I now have plenty of norvells, i think?