The 2005 Sportsman is a versatile All-Terrain Vehicle (ATV) designed for a wide range of demanding applications, from agricultural tasks to recreational trail riding. Known for its robust engineering and reliable performance, this ATV series typically features signature On-Demand All-Wheel Drive system, independent suspension for a comfortable ride, and durable powertrains available in 400cc and 500cc engine variants. These models were positioned as capable workhorses, offering a balance of power, comfort, and utility that made them competitive against other leading brands in the powersports market. This comprehensive service manual provides detailed technical information essential for the maintenance, diagnostics, and repair of the 2005 Sportsman 400 and 500 models. Its scope covers general information, routine maintenance procedures, engine systems, fuel and carburetion, drivetrain components, suspension and steering, braking systems, and electrical systems. The manual includes step-by-step instructions for major repairs, component disassembly and assembly, and electrical troubleshooting, making it an invaluable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their vehicle.