NB Power QRS 5000W Hub Motor Noise

[smontgo5]

I let a friend ride my electric enduro and he dropped the bike after accidentally pulling the throttle.

The hub motor is now making a loud scraping noise after the bike is ridden for a while. It doesn't make the noise when it's cold and I begin riding it...only after the motor warms up. I took off the rear disc brakes to confirm that the noise wasn't coming from the brakes.

Here's a video with the noise: https://www.youtube.com/shorts/At2WYBRsz2Q

Any suggestions as to what it could be and how to fix it?

Thanks!

 

[amberwolf]

If the wheel is definitely not touching the frame anywhere (easy enough to bend rims in crashes), then the next most likley thing is the freewheel scraping on the frame.

Or the freewheel being damaged. What happens if the chain is removed? (this would allow the freewheel sprockets to spin freely with the rest of the freewheel, and eliminate the internals of the FW as the noise source if it continues after this).

Alternately, though less likely, the covers could be damaged in a way that "twists" the motor's magnet rotor so that as things warm up and expand, the magnets touch the stator and scrape.

I let a friend ride my electric enduro and he dropped the bike after accidentally pulling the throttle.

The hub motor is now making a loud scraping noise after the bike is ridden for a while. It doesn't make the noise when it's cold and I begin riding it...only after the motor warms up. I took off the rear disc brakes to confirm that the noise wasn't coming from the brakes.

Here's a video with the noise: https://www.youtube.com/shorts/At2WYBRsz2Q

Any suggestions as to what it could be and how to fix it?