Originally Posted by pampaX
How long (hours) do pistons and rings last? How often do you change the set?
Much less frequently than the book would have you believe!
I think if the bike burns substantial oil, or has low compression, the rings are the first thing I would look at. To my knowledge, that's likely at least a couple hundred hours if you never allow an air leak (from a vacuum line or otherwise) and are good with your air filters.