This manual covers the YFZ450S, a recreational off-road all-terrain vehicle produced in 2003. Engineered with a 4-stroke, 449 cc liquid-cooled engine, this ATV is designed for performance and reliability in demanding off-road environments. Key features include a Mikuni BSR33/1 carburetor, a 5-speed constant mesh transmission with chain drive, and a wet, multiple-disc clutch system. Its robust construction, featuring independent double wishbone front suspension and a swingarm rear suspension, ensures exceptional handling and durability for enthusiasts seeking an exhilarating riding experience.

This comprehensive Service Repair Manual provides detailed guidance for the maintenance and repair of your YFZ450S. It encompasses essential procedures, technical specifications, troubleshooting advice, and safety guidelines necessary for proper upkeep. Owners, mechanics, and technicians will find valuable information on topics such as recommended oil type and capacity, spark plug gap specifications, and detailed component breakdowns. Utilizing this manual will assist in ensuring the optimal performance, longevity, and safe operation of your all-terrain vehicle.