I use PJ1 Blue Label on the 919. I will hose it down every few hundred miles after a ride then wipe off the excess.
When I got my bike, it was dripping chain lube goo from the front sprocket area too. I took off the cover and found 1/4 inch thick gunk in there. Scrapped all that off, use the Blue Label, and now, it doesn't build up. It smelled like the previous/original owner was using gear oil on his chain. That could explain the stink and the slinging.
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