Not sure if this is normal, my brand new ex makes almost like a rattle noise off throttle coasting. It is worse with less regen. I’m guessing chain but cannot pinpoint it. Never owned an electric bike so some of the noise is new to me. Does anyone else’s bike sound like this? Hopefully this video works. Thanks.
What you are hearing is caused by torque pulsations in the electric motor. When coasting with zero regen the _average_ motor torque will be zero. Ideally it should be continuously zero but in practice it will go from slightly positive to slightly negative to average zero. As a result opposite faces of the gears will touch as torque changes from positive to negative. That is why you hear it less with more regen or under throttle, because torque is always either positive or negative.
However, what I am hearing is too much. Damage to the gears could also conceivably cause it. Did you check that there is oil in it?
The best way to hear this noise on any varg is to remove the chain and then open the throttle a little bit so that the motor is doing between 1000 and 2000 RPM. You will hear a similar noise but it will not be so loud. But for your bike it seems too loud, like there is something wrong with either the motor or gears.
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