The Wolverine 450 (YFM450) is a capable All-Terrain Vehicle (ATV) from its first generation, produced for the model years 2003 through 2006. This mid-size utility ATV is engineered for both recreational trail riding and light-duty work, featuring a robust 4-stroke, SOHC, air-cooled engine with a displacement of 421 cc. Key features include Independent Rear Suspension (IRS), an automatic Ultramatic CVT transmission with engine braking, and selectable 2WD/4WD drive systems. The long-standing reputation for producing durable and reliable powersports vehicles underpins the Wolverine 450's design, offering a blend of performance and practicality. This comprehensive Service Repair Manual provides essential guidance for the Wolverine 450 ATV. Covering a wide range of topics, it details complete engine overhaul procedures, cooling and fuel systems, drivetrain components, chassis and suspension, electrical systems, and braking. The manual includes maintenance schedules, troubleshooting steps for common issues, repair and rebuild instructions, and detailed wiring diagrams. Designed for professional technicians, mechanics, and DIY enthusiasts, this resource ensures proper maintenance, diagnosis, and repair, helping to keep the vehicle in optimal condition.