OMG!I do all the needed maintenance.
I ride to work every day 40 miles a day with stock gearing.
I love notes like this where long-time (or very active) owners share their high odometer readings. 21,000 miles of faithful service says a lot about the bike AND the rider.My 93 was almost always wide open on the highway. Many trips from Port Townsend to Seattle or Enumclaw. ( 140 miles round trips) I had more than 21,000 miles on it when I sold it and it was still running great with no major engine work. Adjust valves and carb were the most engine work it had done. I still had the original clutch allthough that was beginning to worry me. I went through 4 front tires and 5 back tires and several brake jobs. Original battery was not replaced until 2002. I also used it roughly in the Washington Cascades off road showing up my 4wd friends and other bikers. These are some the most durable bikes made, although they do vibrate and make noise.
If you are not racing they will do what you need. Just keep up the routine maintenance.