ORIGINAL: FoamyVictim
Interestingly enough, the instructions included in my new O.S. 21 VG, say SPECIFICALLY, don't idle tanks through it for break in, or ever for that matter. The motor never gets up to operating temps, the componants don't expand enough, and the running actually causes excessive wear. Best way to break a motor in, is get it started, and drive it around very rich, getting it to at least 220. I've broken in plenty of motors, airplanes, cars, ect... I do the same thing every time. I put the motor under the operatiing conditions they will be used in.
This is the heat cycling method which he doesn't want to do. Personally, I agree with you, but if he doesn't want to do it, the 'old' way is the only other way...