Hello, I have two 2018 Radrover E-bikes, Identical.  I purchased a Bafang (RM G060.750.D) 750 Watt Motor for one of my 2018 Radrovers.  I installed the motor and everything fit and seemed to install great.  The problem is the 750 motor is not working with this stock bike.  The throttle works perfectly but when pedaled, the motor only works for a second and turns off.  Randomly it works for a few pedal strokes then goes back to not working unless you stop the bike, then start pedaling again.  Then it only works for a small burst and cuts out. 

Because I have an identical bike to experiment with, I swapped every electrical component one piece at a time from my working 2018 Radrover over to this bike with the new 750 Watt motor.  First the PAS Sensor, then the Controller, next the main wire harness, then the display.  The last test was to swap the rear wheels.  One with the stock motor and the other the new 750 watt motor.  The problem swapped to the other bike when the hub and rear wheel with the new 750 motor were put into the known good bike.  The same cutting out problems transferred over to the original bike that was working perfect.

I have tested everything. What is going on here?  Why is this new 750 motor showing these symptoms.  I am a full time mechanic so I can do some advanced trouble shooting if need be.  Can anyone help me.

Is there a testing procedure to test this Bafang 750 Motor, to check that its good.  I was thinking it could be a hall sensor in the motor that might be bad or intermittent.  The throttle and walk mode work perfectly.  The PAS sensor has been adjusted close and the book standard away from the magnet ring.  As I mentioned before, the controller and PAS sensor have been swapped with known good ones.  Actually every electrical component.  It is something in this motor.   

Will this 750 watt bafang motor work with the 2018 Radrover?