This workshop repair service manual covers 450 SX and 505 SX All-Terrain Vehicles produced between 2009 and 2011. The SX line represents their sport ATV offerings focused on competitive riding. These ATVs are engineered for demanding off-road use, combining powerful engines with robust chassis designs for optimal performance and durability. This comprehensive English-language manual provides detailed service, maintenance, troubleshooting, and repair information for all models, engines, and trim types. It includes in-depth coverage of the engine, drivetrain, suspension, chassis, electrical systems, and brakes, along with scheduled maintenance procedures, fluid specifications, and torque values. With hundreds of pages of diagrams, step-by-step instructions, and critical notes, this manual serves as an essential resource for ATV owners, DIY enthusiasts, and professional service technicians to effectively maintain and repair their SX ATVs.