Hey People out there,
I received my AMX LE pretty early and after 50 km I had the exact same problem. I mailed AM and they wanted me to check that the pedals and crank arms are torqued properly and the belt tension is not to high!
I checked everything they told me but nothing changed after adjusting some minor things.
I replied to them but as the enquires got more cause they delivered more Bikes I haven’t heard from them yet.
So I took a deeper look myself as I really like the bike and was eager to continue riding:
Firstly I removed pedals, Crank arms and chain rings. Only thing left now was the bottom bracket. It actually was not torqued enough as it was around 20Nm and should be about 50Nm. If you want to remove it to check if the bearings are greased or the thread is ok be carful because there is the pedal sensor in there (wiring!). To tighten/remove the bottom bracket you’ll need special tools (10€).
I now putted everything back together with all the suggested torques and the noise seems to be gone. I’ll keep you posted if it’ll pop up again.
If you have question about how to do it, don’t hesitate to ask. I’m happy to help!