Also agree with Ahhleyb4 - sounds to me like the diff is slipping. Do it up 1/8 turn, try again, repeat etc etc, but DON'T do it up really tight.
As a rough guide for the gear mesh, place a piece of paper in between the pinion & spur, then tighten the motor screws. There should be a small amount of 'play' between the pinion & spur.
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Current Weapons: YZ2-CA, YZ2-DT, YZ-4SF.
In The Pits: Yokomo R12C, Yokomo MR4-TC Custom, Yokomo MR4-TC Pro, Yokomo MR4-Rally, Tamiya Blitzer Beetle, Tamiya M05.
Driven: Race Red Fiesta ST 
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