I remember trading one in while working at a motorcycle shop in Canberra in the mid nineties, the engine had never been opened up (according to PO), one owner bike that had been used for commuting across Canberra 5 days a week at 60/80/100 kph for 11 years, 72,000 kms on the odo and still ran well!
Even if he was full of sh1t and I don't believe he was, it's still a testament to the reliability of these bikes.
Tony.