The 2010 Sportsman 550 is a robust All-Terrain Vehicle (ATV) engineered for high-performance utility and recreational off-road use. Building on a renowned lineage, this model features a powerful 4-stroke, SOHC, V-Twin, EFI engine, liquid cooling, and an automatic Variable Transmission (PVT) with engine braking. Its design prioritizes reliability and capability, often incorporating Electronic Power Steering (EPS) for enhanced control and reduced rider fatigue. This ATV is built to tackle diverse terrains and demanding tasks, offering a blend of power, comfort, and advanced technology for its class. This comprehensive factory service repair manual provides essential information for the maintenance and repair of the 2010 Sportsman 550. It covers all major systems, including engine diagnostics and overhaul, electronic fuel injection, drivetrain components, chassis, steering, suspension, and brakes. Detailed procedures for scheduled maintenance, troubleshooting common issues, and step-by-step repair instructions are included. The manual is designed to be a valuable resource for owners, DIY enthusiasts, and professional technicians, enabling efficient servicing and ensuring the longevity of the vehicle.