Yep, it's a bit of a hot topic (no pun intended...but it works well ) and I've read that article by Dave Gierke but from some of the things mentioned it appeared to have been written a very long time ago, back when ABC was quite new and they were still figuring out just how tight to make the pinch. I did an experiment on a brand new ABC to see if I could destroy it by running it very rich and cool right from the first start. I ran it like that for 45 minutes then stripped it down for a close look at everything. The piston was totally undamaged, not a mark on it, so it not only didn't get destroyed it wasn't even starting to run in. I was also checking the pinch during every 5 minute run and it didn't change from what it was out of the box.

That experiment got me to change the way I run in an ABC, now I do the first run in a 4 stroke (maybe just breaking into a 2 stroke a little) then slowly lean each run to gradually build up heat over maybe 30-45 minutes. Others of course vehemently argue with me because they've read something somewhere...I'd prefer to go by what I've found out for myself .