Yep, sounds like the chain on my 131k mile, 2002 gen.1. DID 50VA chain with Sunstar sprockets. I still find those 50VA drive chains, every once in awhile. Drive chain that came with our bikes, new.
I receive around 20K miles or so, on my chains. Sprockets alined perfectly, chain lubed with chain wax when the rollers get shiny, and thats about as far as those chains go for me.
Just returned from a 900 mile sport touring ride with the lads up north in the redwood parts of Ca. I took the high mileage bike here, just to see how the ol' wreck would do on the ride.
Ca. Highway 20 from Willits to Fort Bragg, is a race track with great pavement, and myself and the bike kept up, with some of the fairly fast guys. Two guys that are track racers, cleared off, as to be expected. That being said I got the rear tire to the edges, on both sides! Not bad for an old man of 80 years of age! Lol! Running a Dunlop RS 3 on the front, and a RS 2 on the rear. Bike seems to like the tires, and so do i. They work just fine.
Anyway, the ol' wreck went through about five/six ounces of oil, it uses oil when hammered, and when I returned home, had to adjust the chain tension two flats on the six sided rear adjusting bolts. Won't be long, before its time for new a drive chain and new sprockets.
Picked up a brand new RK ZXW chain about a year ago for 35 bucks! No rivet master link, but I found one for 15 bucks. Very high tensile rating on said chain, and I am going to try J.T. sprockets, this time around. See how those parts work for wear.
Just an old man here, rambling on about bikes. Retired, and nothing better to do this morning! Lol!
You all have a great day, now.
Dean