Perhaps the motor pinion sits to close to your spur gear? It sounds like it from what you describe. You need to mesh the gears tight, but not too tight.
Other things to check:
Loosen the pinion but leave it in place. Roll the car on the floor. It should roll silky smooth without any binding in the drive train. Perhaps you have a problem eslwhere in the drive train.
Check the motor bearings. Apparently the X-12 comes with crappy bearings that give in after only a few runs. I never ran mine with the stock bearings as I excanged them for the LRP 50621 ceramic bearings.
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The Tamiya Sheep
Various Tamiyas including TRF201 and TRF511
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