I have had a hard time finding motors for a reasonable price so i finaly bought 25 rs 380 sh motors for $30.00 the only problem they are timed at 3 degrees. To fix this was easyer than i thought just use a small side cutter to bend out the crimps and rotate the back to zero and it drives strait and at a good speed. These motors only cost a few dollars moore than 2 speed400 motors but now i need to get 11 more tanks to use the rest of them.