This comprehensive service repair manual provides detailed instructions and technical specifications for the Polaris Sportsman 400 ATV models from 2001 to 2005. It covers a wide range of topics, including: * **Engine:** This section provides detailed information about the engine, including specifications, troubleshooting, and repair procedures. You'll find information on everything from engine removal and installation to valve adjustments and carburetor tuning. * **Transmission:** The transmission section covers the operation, maintenance, and repair of the Sportsman 400's transmission system. It will guide you through procedures like clutch adjustments, gear changes, and repair of transmission components. * **Electrical System:** This section outlines the workings of the electrical system, covering components like the starter, alternator, wiring diagrams, and troubleshooting procedures for common electrical problems. * **Drivetrain:** The drivetrain section delves into the components involved in power delivery to the wheels, including the axles, differential, and drive shaft. You'll find information on disassembling, inspecting, and reassembling these components. * **Brakes:** This section focuses on the braking system of the Sportsman 400, covering its operation, components, and how to diagnose and repair common brake issues. * **Suspension:** The suspension section covers the front and rear suspension systems of the Sportsman 400 model. You'll find detailed information on adjusting and repairing the suspension components, including shocks, springs, and linkages. * **Bodywork:** This section provides instructions on disassembling and reassembling the bodywork of the Sportsman 400. It addresses the removal and installation of panels, lights, and other body components. * **Troubleshooting:** This section contains a comprehensive list of common problems experienced with the Sportsman 400, along with step-by-step troubleshooting procedures to help you diagnose and resolve these issues efficiently. This manual is a valuable resource for anyone who wants to understand the workings of their Polaris Sportsman 400 and perform their own maintenance and repairs. It's an invaluable tool for both professional mechanics and home DIY enthusiasts.