If you're using the pinion that came with the kit, then the car is likely over-geared for a 14t motor. The kit pinion's are generally good for the silver can motor that comes with it (27t). You want to put on a smaller pinion, or use a larger spur gear to make it easier for the motor to push the car (a 14t motor will have quite a bit less torque than the silver can).
If when running, the motor is getting hot in 2-3 minutes, then that's a good sign that it's working too hard.
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Team C TM2 / Tamiya M03 / Mardave V12
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