This manual covers the 450 SX ATV and 505 SX ATV models from the 2010, 2011, and 2012 model years. These high-performance All-Terrain Vehicles are built with a renowned off-road and racing heritage, offering powerful engines, agile handling, and competition-focused capabilities. Designed for enthusiasts and demanding off-road use, the SX line embodies a commitment to engineering quality and rider-centric design, providing a thrilling and reliable experience. This comprehensive service repair workshop manual provides extensive, factory-equivalent coverage for maintenance, troubleshooting, and diagnostics. It details all major systems, including engine management, powertrain, chassis, suspension, braking, electrical, and bodywork. With step-by-step instructions, exploded diagrams, and detailed technical specifications, this manual is an essential resource for DIY owners, independent repair shops, and technicians aiming to maintain and repair these performance ATVs effectively and efficiently.