The 990 Super Duke, produced from 2003 to 2006, is a naked sportbike renowned for its aggressive styling and potent performance, powered by a liquid-cooled, four-stroke V-Twin engine displacing approximately 999 cc. Building on a strong off-road heritage and a 'Ready to Race' philosophy, this Austrian-manufactured machine established the Super Duke as a benchmark in its class, offering typically 100-115 horsepower and around 90-95 Nm of torque. Its engineering quality is evident in its robust LC8 chassis, fully adjustable suspension, and powerful braking system, making it a favored choice for riders seeking an exhilarating street experience. This comprehensive Service Repair Workshop Manual in English provides detailed guidance for the maintenance and repair of the 990 Super Duke (2003-2006 models). It covers all essential systems, including the engine, transmission, fuel system, electrical components, suspension, and frame, offering step-by-step instructions, diagnostic procedures, and technical specifications such as torque values and fluid capacities. Designed for owners with basic mechanical skills and service professionals alike, this manual ensures accurate and efficient upkeep, enabling owners to maintain their vehicle's performance and reliability while facilitating cost-effective repairs.