This workshop service and repair manual covers the 450 EXC, 400 EXC, and 520 SX models manufactured between 2000 and 2003. These high-performance off-road motorcycles are renowned for their powerful four-stroke engines, advanced suspension systems, and robust construction, making them popular choices for enduro and motocross enthusiasts. Engineered for demanding terrain, these models have a strong heritage in off-road racing, consistently competing against major manufacturers with their focus on performance, reliability, and rider control.

This comprehensive manual provides detailed guidance for the maintenance, repair, and troubleshooting of your motorcycle. It includes step-by-step procedures for engine disassembly and assembly, transmission servicing, fuel and ignition system maintenance, suspension and brake system overhauls, and electrical system diagnostics. Essential technical specifications, including torque values, fluid capacities, and component clearances, are also provided. This manual is an indispensable resource for owners and technicians seeking to ensure their 400 EXC, 450 EXC, or 520 SX operates at peak performance and longevity.