Carrying a chain and sprockets is a pain. They're HEAVY !!
I have many times and always regretted it. You end up changing them too early as you're fed up with the weight of the blasted things.
Get a scotoiler and make sure you keep your chain adjusted well and it should last over 10,000 miles EASY.
You will be able to buy a chain in almost any city in the world. Probably sprockets too if you know what size they are. Remember, sprockets are not made bike specific, especially rear ones.
I suggest you carry a front sprocket only as they can be the awkward ones to find sometimes and of course a couple of master links (split links will do on a 500cc bike)
Keep the ones you have now on the bike unless they're looking noticeably worn out. Why would you carry worn out spare parts ???
Have a look at your route and make a plan to change them in a major town or city.
Find out what the JT sprocket code is for the ones you need and jot it down. It will make life easier when looking for spares when on the road.
If you're really worried, have a full set at home with friends or family in a jiffy bag which can be sent out somewhere before you get there.
If you do plan to carry spare sprockets, zip tie them under your rear subframe..
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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