[dudefise]

No, you can't compete with a broken motor. You can, however, fix a motor, but it is not competition legal and should only be used with simple circuits, not with an NXT brick. Basically we use a dremel to remove the back cover, remove the inductor (looks like a blue resistor, this is what fries first) and the capacitor, and solder their contact points to wires protruding through holes drilled in the back of the casing. then we tape the back on.... not competition legal but it works for prototyping.... good luck!