if you've tried two motors and get the same result on both with the same ez start system then it's gotta be the ez start. have you checked to see if your one way bearing in the back plate is alright? maybe some how it got reversed and the electric motor is trying to turn but being stopped because of the bearing. Also, if you have a pull start that you can try out on the motor(s) just to be sure that would be a good idea to throw it on and give it a pull. If the bearing is alright, then there may be a gear that isn't sitting right in the ez start itself. open it up and take a look. Last, but maybe should be first, is give traxxas customer service a call and let them know what's happening. They may have some additional advice on some things to trouble shoot. They're always very helpful...
:whhooo: