800km after adjusting the chain, it seemed VERY loose again. So loose it was rattling against the folded centre-stand. So I re-adjusted it. It was quiet for about 10km, then it started making a whoosh-whoosh sound when driving. It seems a couple of links on the chain got really stiff, almost seized.
The exhaust is not actually bubbling btw, it's the Nexus 5 sound recording quality.
About 40km later:
Yeah, it's getting replaced. Bought new chain and both sprockets. Although, upon comparison with a new part, the rear sprocket looks perfect imo. If anything, the new one has even thinner teeth.
The front one is slightly worn, at least the teeth seem to be leaning to one side. Annoyingly, the original part seems to be of much higher quality. Has some kind of plastic guides on both sides, and seems to be actually machined, not cast.
But since I got all new parts, I'll replace everything. Annoyingly, the new chain is not "endless", but has a riveting link. I don't need that, because I took the swingarm out anyway, but that's the only chain that was available. So I'll see if I can find someone to rivet it for me, not very keen on spending another 50? for a tool.
EDIT: Oh, did I mention how I love working on this bike? It's such a toy, everything comes apart in minutes, no need to jack anything up or spend hours on your back on the floor :lol: