Well, I think I actually found the cause of it stalling and dipping to the right. I took a look at the gearbox and the shaft, it's not centered. It's tilting downward and to the right. I'll have to inspect it further to see if it's just the way it's sitting on the firewall/fuselage, or if it's bent that way.

One other thing, I got the pinion for the motor but the darn thing is a pain to get on. Anything that might make it easier, or is brute force all that I can do?