This workshop service repair manual provides comprehensive coverage for the Kodiak 400 ATV, specifically for the model years 2003, 2004, and 2005. As a first-generation model, the YFM400 Kodiak is recognized for its utility and capability, embodying a commitment to engineering quality and reliability. This manual is an essential resource for owners and technicians seeking to maintain and repair this robust all-terrain vehicle, offering detailed insights into its mechanical and electrical systems. This manual details a wide array of systems, including engine components such as the top end, fuel, cooling, and lubrication systems, as well as drivetrain elements like the clutch, crankshaft, and transmission. Chassis systems, including brakes, suspension, and steering, are thoroughly covered, alongside the complete electrical system with wiring diagrams and troubleshooting guidance. It provides step-by-step repair procedures based on complete disassembly, along with maintenance schedules, diagnostic information, and technical specifications, making it an invaluable tool for ensuring the optimal performance and longevity of your Kodiak 400.