bummer indeed, surely it has to do with the sand and environemnt? a lot of your photos and locations show that you do seem to gravitate to the beach, so maybe that nasty shit gets in more that we appreciate???
but still a mega pain in the arse for sure, and you are lucky that no crankcase was damaged.
My idea to undo the nut, would use the remains of the chain to wrap around the remnance of that sprocket, and vice grip so that the mother focker don't turn...then the leverage it with your usual tool of choice.
Breaking chains is rare, maybe the 690 is producing too much power :-)
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