The Ninja 250R EX250, specifically chassis code EX250K, represents a significant offering in the entry-level sportbike segment for the model years 2008 through 2012. Engineered with a focus on nimble handling, accessible power delivery, and sporty styling, this lightweight sportbike is designed to appeal to beginner riders, commuters, and budget-conscious enthusiasts. Its reliable four-stroke, DOHC, parallel-twin engine, with a displacement of 249 cc, provides an approximate horsepower of 30-32 HP, making it an approachable yet engaging machine. The Ninja 250R's engineering quality is a testament to a long-standing heritage in producing performance-oriented motorcycles. This comprehensive Workshop Service Manual (WSM) provides complete service and repair information for the Ninja 250R EX250 (EX250J/K) models from 2008 to 2012. It covers all essential areas, including routine maintenance, detailed component overhauls, troubleshooting procedures with diagnostic flowcharts, and essential technical specifications. The manual is designed to empower owners, mechanics, and technicians by offering step-by-step instructions for engine mechanicals, fuel systems, ignition, transmission, brakes, suspension, electrical systems, and frame/bodywork. With its high-resolution diagrams and searchable text in English, this manual is an indispensable resource for maintaining and repairing the motorcycle effectively, ensuring its longevity and optimal performance.