The act of free revving – running a brushless motor at high RPM under no or little load for an extended period of time – can cause damage and subsequent failure of a brushless motor and/or an ESC. 

If allowed to accelerate too high, the rotor can break apart, causing an immediate halt in the rotation of a brushless motor. Not only will this damage the internals of a brushless motor, but in some instances, can damage the ESC as well. The likelihood of a rotor failure is significantly increased if a brushless motor is free revved while hot, such as after a full-battery pack run.

Because brushless motors can attain such high RPM under no – or low – load conditions, the centrifugal forces in the rotor can cause it to break apart.

We recommend that you never free rev your brushless motor in or out of your vehicle. Any damage sustained from free revving is not covered under Novak's product warranty.