My view is that you should only carry the parts that will actually stop you from riding to the next BMW shop. Even so it is not practical to cover everything but you should have all the kit to make a chain repair including a link extractor, spare links and a small length of chain. You should also carry everything to repair a puncture. If you have tubeless tyres you may still need to take the tyre off the rim to either put in a tube (as an emergency measure) or fit a patch to the inside of the tyre if it's a large hole. Spare throttle cable, possibly spare clutch friction plates, the means to bleed the clutch and spare seals if it's hydraulic, or a spare cable.
A spare spark plug, of course but also perhaps some spare ignition parts if it's practical (cost, size).
Make sure you have the tools to fit the parts - sometimes the bike toolkit is not sufficient. Make sure you know how to bump start the bike.
If your bike is fully serviced at the start of your trip you should be able to work out when you're going to need such things as oil filters and brake pads, so you can buy these in time rather than carry them all the way with you.
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