Since Brushless came out with Tekins , Tekins R1 series. I came to this Tekins Brushless From R1 series to RX8, when changing motor or disassembling. Motor makes noise and doesn't run, It'll run if you help push It by hand. ESC heat up quickly, like its working constantly. I think its cogging, its what we call it.

When you change motor or disassemble motor, motor looses it home position with you throttle or trigger. You must have to recalibrate the ESC.

What I post earlier Try recalibrate your ESC.