This manual covers the 2009 Sportsman 300 and Sportsman 400 HO models, renowned utility ATVs known for their capability and durability. The Sportsman line has a long-standing reputation as a flagship utility ATV, offering a blend of comfort and robust performance for various off-road applications. These models are equipped with capable powertrains, automatic CVT transmissions, and robust chassis designs, including options for both 2WD and 4WD, making them versatile for work and recreation. This comprehensive service repair workshop manual provides detailed information essential for the maintenance and repair of your 2009 Sportsman 300 or 400 HO. It includes step-by-step procedures for disassembly, assembly, maintenance, and troubleshooting across all major systems, such as the engine, fuel system, drivetrain, brakes, steering, suspension, and electrical components. With dealer-level detail, including pictures, part diagrams, torque specifications, and complete wiring schematics, this manual is an indispensable resource for owners, DIY mechanics, and professional technicians aiming to keep these ATVs in optimal condition.