This manual covers KX125, KX250, and KX500 motocross competition off-road motorcycles produced between 1988 and 2004. These models are renowned for their performance-oriented design, with the KX125 offering agile handling and strong low-to-mid range power, the KX250 providing a potent powerband and versatile chassis, and the KX500 delivering legendary torque and raw power for dominance in open class racing. There is a long heritage in off-road competition, with the KX line consistently evolving and achieving numerous wins in professional motocross and supercross championships.

This comprehensive workshop repair manual provides in-depth coverage for all major systems, including engine, transmission, chassis, suspension, brakes, fuel, and electrical components. It details routine maintenance procedures, troubleshooting guides, diagnostic charts, and step-by-step instructions for component overhaul and rebuilds, such as top-end engine work, transmission servicing, and suspension maintenance. The manual is designed to assist owners, mechanics, and technicians in effectively maintaining, troubleshooting, and repairing these high-performance machines, ensuring optimal performance and longevity.