This workshop service manual covers the Suzuki Eiger LT-A400 All-Terrain Vehicle (ATV) produced from 2002 through 2007. The Eiger series, manufactured in Japan, has a long-standing reputation for reliability and capability, offering a balance of power and utility for diverse applications. Known for its 4-stroke, SOHC, liquid-cooled engine with a displacement of 376 cc, automatic CVT transmission, and selectable 2WD/4WD drive modes, the LT-A400 is designed for robust performance. Its engineering quality and durability are hallmarks of the Suzuki ATV lineage, making it a trusted choice for demanding terrains and tasks. This comprehensive 424-page English workshop service manual provides in-depth repair and overhaul instructions for all major systems, including the engine, transmission, fuel, ignition, lubrication, exhaust, and electrical systems. It details routine maintenance, tune-ups, troubleshooting, and the removal and installation of components, offering the same information found in authorized dealer service departments. The manual is designed for mechanical technicians and knowledgeable DIY enthusiasts, emphasizing special aspects of the vehicle and its components. It also highlights important safety information using specific symbols and identifies recommended tools with part numbers, enabling users to perform professional-level maintenance and repairs efficiently.