Ed,
How long have you owned the bike, and how many of those miles were ridden by you ?
The odometer read about 26,000 miles when I bought it in 1987. But I've never had a working one for long so I work with hash marks in my shop manual, the same as I do for my R65. My commute is almost a hundred miles a day, so I figure a slash per hundred miles. I figure I've personally put over 60,000 miles on it.
Justin, the only Lucas problems happened a year or two ago when my zener diode finally quit. My puny 120 watt alternator was pushing over 15 volts to the battery, oops. I have a Chinese solid state replacement which works for now. But I have to point out that the regulator on my R65 (at 60,000 miles now) quit before that, so I knew what to look for. I get a kick out of people wanting to upgrade their 280 watt Bosh alternator. :-)
Sigh. A warm (hundred degree) weekend is predicted, so I hope to get the the R65 out for a short ride to warm it up, then change the fluids, then remove the heads and haul them on my Triumph to Steve Prokoff for new valves, guides, and seats. And a big hole in my checking account.
Ed