Originally Posted by ewashburnaf

Also, best way to set your gear mesh.. if you don't like to "eyeball" it:

Put on a pinion gear one tooth bigger than the one you want to run and put the gear mesh as far into the spur as you can get it. Make sure their is no gap between your teeth at all. Then tighten your motor. Take off the pinion and put the 1-tooth smaller pinion on. Voila, awesome gear mesh.... roll it around to make sure there aren't any gaps that are too big.