I have just finished my Coal Hauler II, and I need to know how to set it up (it's my first FF model) I am using an O.S. 40 la for power. I know its not the norm for FF, but It's what is availible. I'm using the stock muffler, 5 servos, and a 600 mah batt.

do I need to upgrade the muffler?
Where do I balance this thing?

Im not sure what the AUW is. I assume its around 3-4 pounds. but I would be guessing.