Originally Posted by crazysavage

I am sure someone will say no way you cant do that to this suggestion but I have been doing this for 3 years and I change my bearings just because they look old not because they are bad. I use metal shielded only, soak them in motor spray for hour or more to remove all grease, install them and make sure i have 1mm of back and forth play on the shaft, make sure the engine is perfectly perpendicular to the spur gear and set mesh with 2 peices of printer paper for 1/8th scale spurs. I set it so that when you pull out the paper it is snug to pull out but not so tight as to tear the papers when pulled on.