There's some merit to it. But only some. A friend of mine builds bike engines for drag racing around here. He runs a very tight pistons to wall clearance. Bikes are air cooled in many cases. So his break in requires steps too. Run it for 30 seconds..shut off let cool. run for 10 minutes just above idle. Let cool totally. run for 30 minutes with light throttle, let col overnight. If you dont, the pistons scuff and ring seal and bores are trashed. I wouldnt do that on a car. BBikes dont have lifters. They have overhead cams. Cmas dont break in on cars the same. If the bores are clean, the honing finish is correct (you'd be very surprised at how many shops that "know" dont get the right finish on the walls), and the rings are chosen and prepped properly, they will seat in the first 2-3 minutes of run time. That's what the moly coating does. It helps them seal. But if the bores are not plateau honed, the moly gets torn off the rings, and you will need to seat them thru some miles. At that point, I agree a little abuse helps...lol. Because it is gas presure that keeps the rings on the walls. It's a cool idea, but I see a bunch of car engines eating cams as a result of this...lol.
