I always wanted to see what was going on inside my motor as I was driving around. I made a video, and was a bit surprised by the results.
Turns out that a few amps makes quite a bit of difference. How hard do you accelerate?
In this video, there is a period of time that either the armature is 'over amped' or? Makes me wonder if there is a problem, or if it is normal for brushes to spark somewhat.
Anyways, enjoy!