Agreed that it looks like chain lube and crap. No signs of oil running so am not too worried.
Actually the story was that the nut was seized and I was struggling to get it off with a power bar and socket for a bit. Trying get purchase on the nut while standing on the brake leaning over from the other side of the bike.
Then said bugger it and drilled it off in a couple of minutes. If your careful it’s not a bad option in the absence of an impact gun.
Running like a dream now, ready for the good Glasgow weather 🙂
Bike in gear, piece of 3" X 3" through the alloy wheel resting on top of the swing arm and that is the wheel held, it will not turn so no need of the brake, you can stand one side of the bike get a friend to steady it and give it some welly.
Or,
Alternatively as commented go to your local helpful garage/service station and remove the case (you can remove most of the screws at home before venturing out) get them to air spanner it loose (After flattening the lock washer) nip it back up again go home, remove it easily and clean up and fit the upgrade nut and NEW washer, make sure your really clean all the grit and crud out from behind the sprocket where it tightens against the shoulder on the output shaft before tightening up, or you will get a false torque setting and the bugger may just come loose, not forgetting the heavy duty loc-tite on the shaft/nut.
Its a great opportunity to clean all around the clutch actuating mechanism as well and give it a squirt of clean oil.