This can still be a problem that is often overlooked.
On my 84 VR I had added a battery in the back and paralled the power connections because I thought the starter was dragging when it was hot, as in drawing too much current. Fact is that after doing this mod as well as filing the tips on the brushplate and dressing the contact areas on the housing the starter spins like it should. That battery was just for weight because under the conditions it really did not contribute a thing.
Great field engineering folks, thanks for passing this along.
