Haven't finished your last few posts, but I did notice a pic of a front sprocket. Bad! So easy to head this problem off. When front sprocket gets worn (It's FIRST element in drive line to wear) it then effects both chain and rear sprocket. Premature wear occurs.
Since the front sprocket is the cheapest bit ... it's always a good idea to swap them out early ... and to NEVER EVER let them get to the state of the one shown in your pic. On long trips I carry at least TWO spares. I prefer OEM but JT are OK too.
With front sprockets, I prefer OEM if possible. Next best would be Thai made JT
sprockets. After that, you are on your own regards quality and longevity. Always Steel, never Aluminum.
On my DR650 I change front sprocket every 6,000 miles. (9k km) This extends chain life by 20% or so (rear sprocket too). Your front sprocket is like a Canary In The Coal mine of your drive line. Take care of it and everything else will last longer.
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