82' 400xs Seca - Currently at 46,000KM's, (28,500 miles) owned for the last 23 years. Still doing long rides, had one a few weeks ago - 9 hours straight - 850km's total (from Toronto to Pennsylvania and back, stopped two times for gas, thing just keeps on going. Last year did a three day 1700 km trip throught Northern Ontario, only issue was a sore bum.
Only thing done internally in the motor for the last 23 years is I checks the valves, they were fine. Externally cleaned the carbs once and rejetted (rebuilt carb while I was at it) since I added a new exhaust (old ones finally rusted), then just regular maintence, oil, new chain, sprokets, pads and good winterizations.
Been very tempted to buy a new bike, this is the only road bike I've ever owned (got it when I was 16), but can't stand to let it go. Guess she's just my high school sweetheart