This manual covers the 450 SX and 505 SX ATVs produced between 2010 and 2012. These high-performance machines are built with a renowned 'Ready to Race' philosophy, offering exceptional power and agility for off-road and competitive riding. Featuring powerful single-cylinder, 4-stroke engines, hydraulic wet multi-plate clutches, and robust suspension systems, the SX models are engineered for demanding terrain and racing environments. Their design emphasizes performance and rider control, reflecting a strong heritage in motorsports. This comprehensive workshop service repair manual provides detailed, step-by-step instructions for all aspects of maintenance, troubleshooting, and repair for your 450 SX or 505 SX ATV. It covers essential systems including the engine, transmission, drivetrain, suspension, brakes, and electrical systems. The manual is designed for owners, DIY mechanics, and professional technicians, offering clear guidance and technical specifications to ensure optimal performance and longevity of your vehicle. With its extensive coverage, this manual empowers users to perform everything from routine servicing to complete component rebuilds and complex diagnostics.