This repair manual covers the Mercury Mercruiser 250 OptiMax JetDrive marine engine drive system, manufactured by Mercury Marine for the model years 2002, 2003, and 2004. Engineered for boating and marine propulsion, this 2-stroke outboard engine system delivers 250 horsepower and offers variable speed operation. Its OptiMax technology signifies advanced performance and reliability, designed to provide a superior boating experience through robust engineering and quality components. This comprehensive manual provides essential information for the maintenance, repair, and troubleshooting of your Mercury Mercruiser drive system. It details routine maintenance procedures, including engine removal and installation, fuel system upkeep, and lubrication and cooling system servicing, alongside electrical system maintenance. Furthermore, advanced troubleshooting guides and parts catalogs are included to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of the unit.