This manual covers the KTM 520 SX and 525 SX models manufactured between 2000 and 2006. These performance motocross motorcycles are renowned for their powerful four-stroke engines, competitive suspension, and lightweight, race-oriented chassis, reflecting KTM's 'Ready to Race' philosophy. Known for their robust engineering and strong performance in the demanding motocross arena, these bikes were designed for aggressive off-road riding and competition, often competing against leading models from other major manufacturers.

The purpose of this comprehensive service and repair manual is to provide detailed guidance for the maintenance, troubleshooting, and repair of your KTM 520 SX or 525 SX. It covers all essential systems, including the engine, transmission, electrical components, and chassis. Within its pages, you will find step-by-step procedures for routine maintenance, detailed instructions for engine and transmission overhauls, guidance on electrical system diagnostics, and procedures for suspension and brake system servicing. This manual is an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of these high-performance off-road machines.