If the motor is not trying to move at all check to make sure that the motor is connected to the speed control and the speed control is connected to the receiver. If you can hear the motor run, check the pinion gear on the motor to make sure it is tight, and check the slipper clutch to make sure it has not backed off.
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Take your motor apart and look at the magnet
If the motor is not trying to move at all check to make sure that the motor is connected to the speed control and the speed control is connected to the receiver. If you can hear the motor run, check the pinion gear on the motor to make sure it is tight, and check the slipper clutch to make sure it has not backed off.