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[rgutt]

Shy of an eminent bearing failure which you may or may not be able to even detect with the bike assembled or a poorly aligned belt (even less likely), a come-and-go vibration is likely an instability in the torque control PID loop. Or more simply, a gain is too high, probably proportional, but I'm really blind guessing without seeing a log of RPM versus Iq, Id, and torque demand.

[zian]

So happy to find this topic !

Here is my new topic on exactly the same subject : https://www.electricmotorcycleforum.com/boards/index.php?topic=13432.0

Here is the bad sound captured in video, is it the same ?

[Curt]

Ouch, my ears. She's gonna blow!