The reasons for the fever of the aluminum shell improvement. Several reasons for the hot motor, 1. The switching line is wrong. Second, line virtual connection. Third, missing items. Fourth, the operation is not smooth. The above will cause the motor to get hot. The sports car is installed on the same amount of distance. Do not be too tight, affect the running car operation, increase the resistance of the operation, and the motor will also heat up the motor. Don't be too loose, easy to fall off.