u/01watts

I have two R135 ze50s, and the other one doesn’t make this noise.

It’s a high pitched sound that occurs at light loads and when releasing the throttle. The pitch goes up and down with speed. There is no rumbling, and everything else sounds normal.

Ignore the pedestrian warning sound at the very end.

It’s not very loud and is easily masked by the radio, so not sure if action is required.