Installed BBS02 3 months ago. No problems until yesterday I noticed a slight “grinding“ noise only when pedaling and the motor is under a load. Does not occur when I put the bike on a stand and turn the pedals and motor kicks in. It is in sync with the pedal rotation. Bike seems to function normally otherwise. I took a video with sound but don't know how to post it. All parts are still tight.
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BBS02 noise
BBS02 noise
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Did you get this noise resolved? I have the same symptoms after only 38 miles. No sound on stand, or when pedaling with motor off.
ive had some odd similar clicking grinding before, mostly after shifting too fast or popping my chain under load accidentally. shifting gears around a bit to smaller cogs then back up to the large ones resolved it for me. sometimes the chainring can rub on something so make sure theres nothing mechanically wrong externally, obvious things you can see. make sure your drive cover bolts and chainring bolts are snug, not loose. sometimes turning the motor off, run through the gears a bit then try it again, may fix it.