The 2004 Sportsman 400 and 500 represent robust utility all-terrain vehicles, engineered for both recreational riding and demanding work. Known for their durability and versatility, these ATVs feature a powerful 4-stroke engine with strong low-end torque, liquid cooling, and an on-demand all-wheel-drive system for exceptional traction in various terrains. With a comfortable riding experience and significant towing and carrying capacity, the Sportsman line has been a cornerstone of offerings, providing reliable performance for hunters, utility users, and recreational riders alike. This comprehensive Factory Service Repair Workshop Manual in English covers all repairs, servicing, and troubleshooting for the 2004 Sportsman 400 and 500 models. It delves into every critical system, including the powertrain, drivetrain, chassis, electrical, and braking systems, providing detailed procedures for maintenance tasks, component replacements, and complex repairs. The manual is designed to be an indispensable resource for owners, mechanics, and technicians, offering the in-depth information needed to maintain the longevity, performance, and reliability of these capable ATVs.