This manual covers the Kawasaki KX450 Motocross model for the production years 2009, 2010, and 2011. Engineered for high-performance motocross competition, the KX450 features a liquid-cooled, four-stroke, DOHC single-cylinder engine with a 449 cm³ displacement and a dual-injector Digital Fuel Injection (DFI) system. Its advanced chassis includes a 48mm inverted telescopic front fork and a Uni-Trak rear linkage system, designed for exceptional handling and rider control. The KX450 is renowned for its racing pedigree and competitive edge against other leading motocross bikes.

This comprehensive 440-page service manual provides full factory repair and maintenance information, targeting Kawasaki dealer technicians and professional mechanics. It details engine internals, including top-end rebuilds and transmission work, along with the DFI system, lubrication, cooling, drivetrain, chassis components, and electrical systems. The manual includes complete disassembly and reassembly procedures, diagnostic troubleshooting, periodic maintenance schedules, and necessary adjustments, offering factory-level detail for all repair tasks, including torque specifications and special tool identification.