The 2009 Sportsman 300 and 400 H.O. represent a robust entry into the utility All-Terrain Vehicle (ATV) market. As part of the third generation of the highly regarded Sportsman line, these models are engineered for reliable performance in demanding off-road conditions. They feature a single-cylinder, liquid-cooled engine with High Output (H.O.) designation for enhanced power, available in both 2x4 and 4x4 configurations. The independent front suspension ensures a comfortable ride and capable handling, while the automatic Variable Transmission (PVT) with engine braking provides seamless operation. Known for their balance of performance and value, these ATVs are well-suited for a variety of tasks, from trail riding to utility work. This comprehensive workshop service repair manual provides detailed guidance for the maintenance, troubleshooting, and repair of the 2009 Sportsman 300 and 400 H.O. models. It covers all essential systems, including the engine, fuel system, CVT transmission, final drive, brakes, and electrical components. Within its pages, you will find step-by-step procedures for routine maintenance, diagnostic strategies, component rebuilds, and technical specifications. This manual is an indispensable resource for professional technicians and experienced owners alike, ensuring the longevity and optimal performance of your ATV through accurate and thorough information.