to break in I Idled 3-4 tanks then started leaning out and blurpping throtle, next 2 tanks I did short runs up and down the road, then I leaned out to race temps and put the hammer to it. . I run Byron 20% and temps are between 200-220, the first run of the day I always heat motor up with heat gun, but the rest of the day I just start with out heating. Every race day I install a new airfilter and pre filter, and every 2 rounds of qual. I install a new pre filter thanx for the info