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IIRC, I used BelRay marine grease that I bought at a Yamaha dealer. I think it is recommended for outboard motor use.I know it is thick as hell, and I think it even came with a brush.
Spline lube threads are only bested by oil threads. I bet we get at least 3 pages of discussion as to what is best.
When I did the first service on my V7III it was obvious the factory added Molly, I asked the dealer and they don't add it when they do first service, any thoughts on that?
30 years ago I was using Honda's Moly60 stuff because that is what they recommended on their Wings. Well, I finally ran out of the Moly 60 about a decade ago.
I still have 2 sleeves of this left but I'm sure there is another substitute that will work just fine. I started using it years ago when I was riding BMW air-heads.