We are looking for advice regarding Yamaha 2-stroke engine for their (older) line of personal watercraft- say 2002 - 2007; pre-four-stroke motors. We want to buy two used ones (the full watercraft, not just the motors), and don't know how to gauge the hours of use on the Hobb's meter. How many hours is too many? What if the cost of a rebuild? How do you know it needs a rebuild? IF this was about chainsaw motors, I could answer my own questions. Looking for FReepers with experience with Yamaha PWC.