The EC series of Enduro Motorcycles, specifically the 2003 models including the EC 125, EC 200, EC 250, and EC 300, represent robust machines designed for demanding off-road performance. These Spanish-manufactured motorcycles are celebrated for their potent two-stroke engines, capable chassis, and competitive off-road prowess, making them a favored choice for riders seeking a tractable and powerful experience in technical terrain. The EC series competed in a significant segment of the European market, offering a blend of aggressive styling and reliable engineering that appealed to enthusiasts and competitors alike. This comprehensive workshop manual provides detailed service, repair, and maintenance procedures for the 2003 EC models. Covering a wide array of systems from engine overhaul and fuel system management to suspension, brakes, and electrical diagnostics, this manual serves as an indispensable resource for owners and technicians. It includes step-by-step instructions, technical specifications, torque values, and troubleshooting guidance, all presented in full color to facilitate understanding and ensure the longevity and optimal performance of your EC motorcycle.