How many miles is the life of a motorcycle?

Much like cars, this all depends on how it is treated. If you perform the maintenance when it is needed they can last for many years. My brother has an 80's model bike that I know he has gone past 400K miles, but he is religious with the maintenance plan and takes great care of it. ----------------------------------- Some types of motorcycles simply last longer. I have helped a man restore a 72 Harley for the bike's third full restoration with only 50,000 miles on it. I have seen many BMW and Honda touring bikes well into 6 figures of mileage. If you don't maintain it, don't expect this to happen.