This manual covers the LT-A400 and LT-A400F Eiger All-Terrain Vehicles (ATVs) produced between 2002 and 2007. These ATVs are known for their reliable 376 cc liquid-cooled, single-cylinder engines, offering a blend of utility and recreational capability. The LT-A400 features a 2WD drivetrain, while the LT-A400F boasts a 4WD system, allowing on-the-fly engagement. Both models utilize an automatic torque-converter transmission with high/low range, neutral, and reverse. Key features include dual hydraulic disc brakes at the front and a sealed oil-bathed multi-disc brake at the rear, providing dependable stopping power for various off-road conditions. The Eiger series is recognized for its durability and competent performance, reflecting an established legacy in the ATV market. This comprehensive Factory Service Repair Manual provides detailed, step-by-step instructions for the maintenance, diagnosis, and repair of your Eiger ATV. It covers all major systems, including engine top end, fuel system, cooling system, lubrication system, drivetrain, clutch, final drive, chassis components such as wheels, tires, brakes, suspension, steering, and frame, as well as the complete electrical system and wiring diagrams. The manual includes scheduled maintenance procedures, fluid checks and changes, filter replacements, and detailed troubleshooting guides to help identify and resolve common issues. Its factory-level technical depth ensures that owners and technicians have the necessary information to maintain the ATV's performance, reliability, and longevity effectively.