There wasn't anything wrong with my stock motor but I wanted to try the RC4WD FF-030 which I think is a 100t motor and has a 10t pinion. Doesn't come with wires and the PH 2.0 connectors I have don't have the good silicone wire. So I just unsoldered the ones on the stock motor and sued them. I ran it a little bit on the inside course and to be honest I didn't notice much difference. When turning the motor by hand you can feel that it has stronger magnets.