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its chassi asll bits arew not made equal like me and my cousin got ms sports i got pissed cause it couldnt run all these fat gear ratios like kitt races car the way my chassi was the gears rubed then his brother got one and i tried kitt racer gears and regular gears with 7T pinion and it worked not all bits are created the same thats all but try zip zap gears they work with 7T on a bit
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