One motor is not synchronize with other 3 motors

1. When the throttle is fully down three motors are spinning very slowly  and one motor doesn't spin. When raise the throttle a bit the 4th motor that was not running start to spin. Can someone advise what could be the problem?  I synchronize all motors as in the guide.

2. Is there a way when motors are armed and the throttle is down that the 4 motors will not start to spin?

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  • Whenever I have this issue it has been the ESC's are not calibrated to the transmitter.

    Is it possible the calibration is not being saved.


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