The sprockets look flawless. No metallic or unusual wear showing where it shouldn't be as far as I can tell.
Yesterday I did first bike clean after 7000+ km and saw that the chain jumping (due to slightly loose chain and uneven thumper power?) has not only eaten into plastic on chainguard, but also slightly into the swing arm where the chain passes over it to go to front sprocket.
A magnet would have been good to have, since I think swing arm is alu..
I have spare chain and sprockets with me. I think I will just keep an eye on the swing arm and keep going if there is no well known serious problem related to finding these metal shards. Of course it shouldn't be there but a lot if things happening to bike... Broken speedometer, bent parts all over the place etc
I guess I could tighten chain a little but not sure I want to mess with that since it has worked well so far on my trip and most stuff I do on the bike info for the first time (=risk of messing it up even more). Chain jumping is maybe to be expected on a thumper that hasn't got a too tight chain... I try to use gears in a way that minimizes it.
Thanks for the advise. It gives me a little more confidence that even though it might be serious, there is no obvious and common issue going on. Being a beginner on this, I guess sometimes you have to just close your eyes, twist the throttle and hope for the best.
Thanks again! I will keep an eye on how it develops. Now into Georgia