simple way to brake in motor, since racer query me via pm, i hope this help.
-brake in actually is to reshape the brushes of the motor.
-new brush normally flat and not shape, they has less contact surface compare to motor which has been brake in...this is due to the commutator was shaped in round.
-as we know, less contact point in between brushes and commutator, the brush will provide less electricity to the rotor, in this case, your motor will has less power and speed.
-to reshape the carbon brush(only sprintdash/powerdash also hyperdashpro/automictunedpro allowed to do so),
you need: cleaner, lubricant...some time multimeter and etc.
step:
1. lube the bushing, which the top end of the motor case, you must always keep your bushing lubed, bushing is the major friction point of your motor, it will be spoil easily, to protect it will ensure it lifetime and performance.
2. low batteries, normally use 1.5 volt or lower power to run the motor, this is the step to reshape the carbon brushes.
3. always keep eyes, thus to ensure the motor is not overheat, overheat will damage the magnet.
4. judge the motor brake in stage via motor rev noise/rpm/amp draw reading/speed. anyhow, motor with no load speed will not be assure that it can run good on loaded. test and record is needed.
5. after brake in, clean your motor by using RC cleaner or any cleaner which you prefer, remember to lube your bushing after you cleaned your motor. now your motor is ready to run.
remind, keep your bushing protected and no
there is no shortcut for brake in motor, you need to pay for machine like M-Master, or each stage of brake in, you need to bring your motor to test and record the time or speed.
this is how motor look like after brake in:
motor will be damage after several use, you have to change motor frequently if you are request for performance...motor will not last forever.

this is how the brushes look like after braked in. the brush will be rounded..