The Polaris Sportsman 400 HO, produced from 2008 to 2010, is a capable mid-size utility ATV designed for recreational riding, light utility tasks, and trail exploration. Known for its robust engineering and reliable performance, this model features a 399cc liquid-cooled, 4-stroke engine, an automatic Variable Transmission with engine braking, and on-demand all-wheel drive. Its independent front suspension and swingarm rear suspension provide a comfortable ride, while the substantial rack capacities and towing capability make it a versatile choice for various outdoor activities. This comprehensive Factory Service Manual provides detailed guidance for the mechanical and electrical repair and maintenance of your Polaris Sportsman 400 HO. Covering all essential systems including the powertrain, chassis, brakes, and electrical components, the manual offers step-by-step instructions, diagnostic procedures, and technical specifications. It is an indispensable resource for professional technicians and experienced owners alike, ensuring the vehicle remains in optimal condition and performance through proper upkeep and timely repairs.