I have an 84 bought used with about 15,000 miles on her and I broke the speedo cable at 25,000 and have never replaced it that was 4 years ago.
I have set the valves once and I change the oil once a year justt to keep it lubed. I have never been left stranded and it still starts with a couple of kicks even after winter storage.
I rode her last year for 5 days straight on the OBDR through Oregon about 900 miles.
I keep her for a spare bike now but I would never sell.
Use the force Ride we must