This workshop repair manual provides comprehensive coverage for the Suzuki Eiger 400, model code LT-A400, from its first generation production years of 2002 through 2007. The Eiger 400 is a robust and capable all-terrain vehicle known for its reliable 376cc liquid-cooled engine and automatic transmission. Designed for a variety of utility and recreational purposes, this ATV embodies Suzuki's reputation for durable engineering and dependable performance in the powersports industry. This manual is intended for all models, including automatic transmission variants, ensuring broad applicability for owners and technicians. This English-language manual serves as an in-depth guide for maintaining, troubleshooting, and repairing the Suzuki Eiger 400. It meticulously details all essential systems, including the engine, automatic transmission, driveline, suspension, braking, and electrical systems. Coverage extends to routine maintenance procedures, component disassembly and reassembly, and provides crucial technical specifications, torque values, and detailed wiring diagrams. By offering manufacturer-level detail, this manual empowers DIY enthusiasts and professional mechanics alike to perform all service and repair tasks efficiently, ensuring the longevity and optimal performance of the Eiger 400.