I will be breaking in a K&B .40 next week. I have read everything I can get my hands on about these procedures, including the manual that came with the engine. My question: Why do you break these in slobbering rich? I overhaul full size air cooled aircraft piston engines for a living, among other things, and know first hand that it is the heat that speeds the break in process. The full sized engines have iron rings with steel cylinders, from what I read, glow engines are constructed the same. When running slobbering rich, the cylinder would seem to me to run too cool, which would prolong the break-in process. Am I way off base here or what. I have heard folks at the flying field say that they run them hot and they break in just fine. I don't want to ruin a new engine. Any comments appreciated.
-Tom