ORIGINAL: MOTORMAN37
Charley,
How many TH .75's have you run?

I am speaking from experience with these engines.

I simple heating of the head and cylinder with a Monokote heat gun is all that is required to enable an easy start the first time. I have TH .75's with over 12 gallons thru them that are tighter than a brand new OS AX.
Only one; belonged to a guy I taught to fly. We broke it in by the book without a heat gun. Quit trying to be right and accept the fact that there are many ways to success. One of these is the manual that came with the engine.
CR