1) What will happen if I use all 3 shims and don't need them? Just less power? How do I tell if I need them or not, just pull one at a time and see how it responds?
2) Define cold? I have always just used sport engines and boring old Fox "sport" plugs. Should I be looking at OS #8 or something else?
3) Well, at least I got one thing right...
4) Seems fair to me. At least rich won't hurt anything like lean will.


1). If the motor is uncompressed, it won't unload as well in the air and it will be down on potential RPM numbers. Unfortunately, we don't have a lot of data on what these motors should turn a specific prop. I think it will take some testing.
2. I would use either a KB 1L, KB HP, or McCoy #9. The OS #8 seems to work well in just about everything, I just tend to avoid them because of their heavy price tag.
3.
4. Exactly, and you don't know how the coarseness of the threads will be from motor to motor. I wouldn't suspect the tolerances on these motors to be consistently close.