The 2010 450 SX ATV and 505 SX ATV represent a commitment to high-performance, off-road recreational vehicles, drawing on extensive racing heritage. These ATVs are engineered for demanding terrain and competitive riding, offering powerful LC4 engines with a displacement of 450cc and 505cc respectively. Built with a focus on rider-centric design and robust construction, they feature liquid-cooled, DOHC engines, manual transmissions with hydraulically operated clutches, and advanced suspension systems designed for superior handling and control. The SX line embodies a dedication to delivering potent and reliable machines for enthusiasts seeking peak performance. This comprehensive Service and Repair Manual is designed to be an indispensable resource for owners and technicians working on the 2010 450 SX ATV and 505 SX ATV. It covers a wide array of critical systems, including detailed procedures for engine disassembly and assembly, powertrain components such as the transmission and clutch, as well as the chassis, suspension, brakes, and electrical systems. The manual provides step-by-step repair instructions, maintenance schedules, fluid specifications, and troubleshooting guidance to ensure optimal performance and longevity of these ATVs. Its clear, easy-to-follow instructions and high-quality diagrams make it suitable for all skill levels, facilitating efficient maintenance and repair.