I own (2) 500 CF Moto Z forces and they both hum when engaged in gear and going slow. Reverse or forward but it is much louder in reverse. Do they all do this? Is this normal?

[2015 Z Force 800 53/Trail EPS]

Is this while moving..or just sitting still in gear?

Is this while moving..or just sitting still in gear?

It does it both times. Its a whirring sound and sometimes does it when in park.

[2015 Z Force 800 53/Trail EPS]

Sounds like a failing oneway bearing. Time to pull the primary apart for a full inspection.