Hi Ed, pretty interesting! so basically when you lap a p/s the surface finish will be superior to that of an engine broke-in normally on the bench??? I know if you lap correctly all machining marks will be removed from the metal surfaces and it can obtaining very close fits between mating parts, but will it produce an even better fit than breaking the engine in on the bench?
Also why exactly does the engine loose compression so rapidly when prepared in this way?
I've heard of people lapping engines but I dont know in detail how the process is carried out, is the helical lapping method used on 2-stroke motors to?
Cheers