Chances are if you cooked the rotor causing it to lose is magnetic properties, then you likely cooked the stator as well. If there are black burn marks anywhere on the coil, then it's junk, you can also smell it and any signs of "burnt electrical" smell then it's garbage. I've learned to replace my motors every 6 months to a year tops, if it's in decent working condition, I'll bundle everything together into a RTR deal and buy all new equipment in order to be competitive.