Sure thing Keith.

The factory setting is such that the high speed screw needs to be screwed in 1 to 1-1/2 turns (if memory serves) after some 40 oz of fuel. At half a gallon, you're there. At that point, the mixture lever will start working as expected. With the factory setting, the control seems to not affect the engine much as you are going from pretty rich to slightly less rich and response is not noticeable. At 2/3 of a gallon, you can get her rockin'.

You will also notice that the fuel delivery, and hence the mixture control lever, differs between props not insignificantly. What is lean on a 12x6 is rich on an 11x8. I can max her out with a full forward lever on a 12x6 and then have to pull back 2/3 travel if switching to an 11x7 or 11x8.

Among a few different props I've tested (APC, Rev-Up, Graupner, Xoar & Falcon) my preferred bench prop is the Falcon 11x8. She has yet to fly.

David