This manual covers the 2003 WR250, a versatile off-road motorcycle known for its potent four-stroke, liquid-cooled, single-cylinder engine and robust chassis. Building on a heritage in performance and reliability, the WR250 series is engineered for demanding trail riding and competition. Its design emphasizes advanced suspension, efficient power delivery via a 6-speed transmission and carburetor system, and durable construction suitable for challenging terrains. This model represents a commitment to delivering high-quality off-road machinery that balances power, agility, and rider control. This comprehensive service repair manual provides detailed information for the maintenance, troubleshooting, and repair of your 2003 WR250. It includes step-by-step procedures for engine disassembly and assembly, transmission servicing, chassis component maintenance, electrical system diagnostics, and fuel system care. You will find essential technical specifications, fluid recommendations, and guidance on common wear items. This manual is an invaluable resource for professional motorcycle technicians and experienced DIY enthusiasts, enabling them to maintain their WR250 to factory standards and ensure optimal performance and longevity.