2SI 690 engine with electric starter, carbs and gearbox. This engine has been sitting for a number of years and is mounted on a challenger II. I don\'t know how many hours are on it but I rebuilt all the carbs, hooked up gas lines and tried to start it. It cranked over well but I could never get a good spark out of it. The inside of the engine is well lubed and has good compression. I bought a new stator for it but then never installed it. I don\'t know a lot about this engine but I know some people like them. I am planning on using a rotax instead. I don\'t know if it works but it doesn\'t look in terrible shape. I can\'t guarantee anything on it but I know worst case it would make a good parts engine. Happy offerding!