I'm new to the world of E-bikes and I'm on my path to building my first one, actually. Channels like yours are an invaluable treasure trove of information. I just wanted to take a moment and thank you for posting these videos. Thank you.

Without a recording of the noise you're talking about this video isn't much help

I have the 750w mid drive and I've just clocked over 6000 kilometers and I've just replaced a worn out 8 speed shimano cassette and chain wheel. Gone with the stock 44t and upgraded to a 42/12 microshift cassette. The chain is fairly new and no signs of wear. Now since I've had the motor out and regressed the whole motor I'm getting a squeaky chain noise coming from the motor. I'm puzxeled cause I know I added enough good quality grease to it

Loctite 660 will fill the gap and retain the shaft in the bearing as long as there isn't something else going on. Helical gears like these have significant axial loading, I wonder if there's a thrust bearing not doing its job.

Good information, great start.What was the solution?

Try fusing the shaft with some instant gasket to the inside wall of the barring as long as the barring is spinning free it should hold the shaft true.

The Weicon AN 306-41 shaft glue (20 ml pen) will do the job if you can not obtain the Loctite. Costs some 12-14 euro.. I will do the operation this weekend... :)

new bearing..?

2000 miles and getting noisy is piss poor , they really need to improve the motor design . I compare it too my car engine that left the factory in 2001 and has never been opened and still runs like a beauty . They need to do better .

I had a motorbike with a similar problem I replaced bearing and turned the shaft and down and used a small Bush the motorbike is still running today

Good morning , I did not understand how the motor drives , because it is linked to a plastic gear that is silly , it does not hold , as it has an internal bearing .

build up the shaft end with a MIG or TIG, then turn it back to original on a lathe. Engineering shop can do it. Get some Iridium into the build up alloy.

what happened now ????????? is it fixed ??????????????????????????????

Do you still have this motor? If you do, is it still working?

maby you can use some plastikpadding steele

You can fix it with locktight red(glue). After that it can not vibrate.

Replace bearing use loctite 660 to fill gap

I'm having the same problem with 950 MI

Without seeing more, I would say: "time for a new bushing". But, I think I saw another vid of yours so, you've likely figgered that out. Thanks! Jim@MidOhio

Pack final drive gears full of grease.

turn it down and put a bushing in it. Machine shop could do that

Red loctite!

im concenred about the amount of force these motor put on bike frames and also the pulling forcing on the rear swing arm and axle/dropout hub. . consider an electric car jack uses a 12v 120w motor to lift a 1 ton car. only a properly tested frame by manufacturers should be used with a motor rated for the force.