This service manual provides comprehensive guidance for the Polaris Sportsman and Xplorer models manufactured between 1996 and 2003. These versatile ATVs, including various 400cc and 500cc configurations such as the Sportsman 500, Xplorer 500, and specialized editions like the Sportsman 500 RSE and Sportsman 400 Desert, are engineered for robust off-road performance. Known for their powerful twin-cylinder engines, automatic CVT transmissions with on-demand all-wheel drive, and comfortable rider ergonomics, these Polaris models have established a strong reputation for capability and reliability in recreational and utility applications. The purpose of this manual is to serve as an essential resource for owners, amateur mechanics, and professional technicians. It covers a wide array of critical areas, including detailed maintenance procedures, routine tune-ups, lubrication schedules, and fluid specifications for the engine, drivetrain, and braking systems. Furthermore, the manual offers systematic troubleshooting guides, repair and rebuild instructions for all major components, and essential wiring diagrams to aid in electrical diagnostics. By following the information contained within, users can effectively maintain their vehicles, prevent premature wear, and ensure optimal performance and longevity.