motor
 

As I am breaking my motor in (19Turn) at 2 volts and 5.40 amps, then as I increase it to 7 volts and 8.00 amps, my motor starts to vibrate and numbers start to jump up and down, what does the mean

Big Papa :smile:

Your armature is not perfectly balanced (not very fixable unless you are willing to drill some material away) and causing the brushes to bounce; this causes arching, and funky amp draw numbers. Generally, the motor will run fine in your car, but not nearly as efficient and powerful as a motor that is perfectly balanced.

might want to try skiming the com too , as well as what was mentioned ,checking the balance of the arm ... I had a 19t do the same thing , cut the com and did notice the com being out of round ....motor now runs fine ....

Why would you want to break in your motor at 7v? Stick with 1-2v.