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You have to be extremely careful when soldering the new motor on. The brushes are held in plastic, and you can easily apply too much heat and ruin it. The motor should run without the capacitor. If it doesn't, either you have the wiring wrong, or you have melted the brush holder, or else maybe your controller is bad. It is possible for a crash, or a dying motor to kill the controller. If you get the motor going, you should be able to get a capacitor at an electronics shop. Anything from 0.01uF to 0.1uF at 50v would work to stop interference.