Having had the privilege of installing, running, and inspecting this secondary reardrive, I must emphasize, again, how important it is to seal the right side of the bevelbox from moisture, nastiness, and road grime. This starts inboard of the swingarm and includes the exposed needle bearing cage and its vulnerable races. My early Sport did not have the washer installed there.
Absolutely make sure yours has that washer over the needle cage. Grease it all really well. This time, I used the Klübar Staburags to prevent anything form getting in.
Another V11 Achilles' Heel revealed!