The XS400, produced from 1977 to 1982, is a renowned motorcycle celebrated for its reliable inline-twin, 4-stroke engine and enduring legacy. Known for its robust engineering and performance, the XS400 has appealed to riders and enthusiasts for decades. This manual covers all styles of the XS400, providing comprehensive information for owners and technicians alike, ensuring the continued operational excellence of this classic machine. This factory service repair manual offers complete, in-depth guidance for the XS400, encompassing maintenance, troubleshooting, repair, rebuild, refurbish, restoration, and tuning. It details every system, including the engine, drivetrain, chassis, and electrical components, with clear, step-by-step instructions, detailed illustrations, and wiring diagrams. The manual is designed to empower owners and mechanics with the factory-level knowledge needed to maintain and repair their XS400 efficiently and effectively.