New Tongsheng noises

[Sekine]

Hi all. I just installed a new Tongsheng 750 watt motor on a road bike. It seems to work well but it is making a whirring sound even when there is no power applied from the motor when pedaling. Does yours do this as well? I was thinking of taking it apart and inspecting it for lack of grease.

This has not been my experience with my other ebike I own with a Ananda m81 motor which is silent when the motor is off.

 

[gromike]

It has been recommended to add grease to the large final drive spur gear. Easy to do once the pedal crank is off. When I checked mine it had almost no greases at all.