This workshop service repair manual covers the Kawasaki EX250-J, commonly known as the Ninja 250R. This model represents a significant iteration in Kawasaki's long-standing tradition of producing reliable and performance-oriented motorcycles, particularly within the popular Ninja sportbike lineage. Engineered for accessible performance and rider control, the Ninja 250R has earned a reputation as an excellent entry-level sportbike, celebrated for its mechanical simplicity and dependability. This manual is designed to support owners, DIY mechanics, and professional technicians in maintaining and repairing all EX250-J variants globally. This comprehensive English-language manual provides factory-level information across a wide range of systems, including the powertrain, chassis, and complete electrical system, featuring detailed wiring diagrams. It outlines scheduled maintenance procedures, fluid changes, filter replacements, and offers in-depth guidance for disassembly, assembly, and reinstallation of all major components. Furthermore, it includes diagnostic procedures for common issues and detailed troubleshooting steps. With hundreds of pages of diagrams, critical specifications, and step-by-step instructions, this manual is an essential resource for ensuring the optimal performance and longevity of your Kawasaki Ninja 250R.