With my motor geared at 28/128 it does get a little warm. But it does not damage the brushes any. I get about 2-3 runs out of it before a rebuild. Our track is a 180x 80 if that helps. Also what brushes are you using? I am using Lightspeed brushes.
The springs should not touch the collars when setting on a stand. There should be a gap between the spring and the collar.
Later,
