What is the easiest motorcycle to maintain/ repair?

Sports bikes are probably the hardest to maintain and repair. It stands to reason that the simplest bikes to maintain are the simplest. That would mean small single-cylinder machines like moped, scooters, etc. Modern bikes, especially Japanese bikes, have gotten more and more complex over the years, and a large part of the reason for this is that they are so reliable that the complexity isn't a problem. So long as you keep up with oil changes, valve adjustments, etc., a modern Japanese bike (especially water-cooled) will last a long long time without the need for much work. One of my bikes an ST1100, and it has to be one of the most complicated bikes ever made. You take off the plastic covers and it looks as complicated as a modern car under the hood. But the bike has 65k miles on it now and it's never needed anything but a new battery and a radiator cap. We even checked the valves, that was about a 1-hr operation, but it didn't need adjustment. A sport bike would be the same, unless ...  more