This workshop repair manual provides comprehensive guidance for the Kawasaki KX125 and KX250 models, specifically those designated KX125 M1-M3 and KX250 M1-M2, likely from the mid to late 1980s. These motorcycles represent a lineage of performance-oriented motocross machines, known for their aggressive, high-RPM power delivery characteristic of dedicated racing equipment. Engineered for demanding off-road use, they feature robust two-stroke engines, sophisticated suspension systems, and powerful hydraulic disc brakes. The Kawasaki KX line boasts a rich history of success in professional motocross and supercross, a testament to their enduring design and competitive spirit. This service manual serves as an essential resource for enthusiasts, DIY mechanics, and professional technicians. It covers a wide array of critical systems, including detailed procedures for general information, periodic maintenance, fuel and cooling systems, engine top and bottom end, transmission, wheels, final drive, brakes, suspension, steering, and the electrical system. With step-by-step instructions, exploded views, and diagrams, this manual facilitates efficient troubleshooting, maintenance, and repair, ensuring the longevity and optimal performance of your Kawasaki KX motorcycle. The digital format allows for immediate access and convenient printing for workshop use.