The Yamaha WR450F is a high-performance dual-sport and off-road motorcycle, renowned for its robust engine design and advanced suspension technology, specifically the Kayaba Speed-Sensitive System (SSS). Evolving from Yamaha's successful YZ motocross lineage, this second-generation model (2007-2009) emphasizes power, handling, and durability for demanding off-road conditions. It is celebrated by off-road publications for its potent engine, excellent power-to-weight ratio, and superior off-road capability, making it a competitive choice in its segment against rivals like the KTM EXC and Honda CRF-X series.

This comprehensive service repair manual and parts diagram guide covers the Yamaha WR450FW (2007) and WR450FX (2008) models. It provides detailed instructions for a wide range of maintenance and repair procedures, including engine disassembly and reassembly, fuel system tuning, ignition system diagnostics, transmission servicing, cooling system maintenance, electrical system troubleshooting, and suspension adjustments. The manual also includes crucial technical specifications, troubleshooting charts for common issues, and hundreds of high-quality photos and wiring diagrams, serving as an indispensable resource for owners and technicians to ensure optimal performance and longevity of their WR450F.