Originally Posted by IslandBwoy
Just so that i'm clear, you saying that by bending the spring inward i would imagine, gives higher torque for smaller tighter tracks? And bending them out (tighter) gives higher rpm??? Is that how this works? How are you bending the springs might i ask just incase i have it backwards.
Not necessarily. These spring tension combo's just happened to be the best ones for the two different brushes being used with each unique motor. You have to keep in mind that two different armatures of the same exact model may require much different brush/spring combo's.
However, the common thought is that the tighter the spring tension, the more torque you'll have and vice versa.
Also note that the XXX brush setups negative spring is red. This would actually have less tension than the F brush setups negative purple spring, even it it were bent inward slightly for "softer" tension.