The KTM 990 Super Duke, produced between 2003 and 2007, is a high-performance naked sportbike renowned for its aggressive styling and potent LC8 V-twin engine. This Austrian-manufactured machine offers a thrilling riding experience, characterized by its powerful performance, estimated at 120-125 HP, and robust torque output. Its design emphasizes a no-compromise approach to speed and handling, featuring a chromium-molybdenum steel trellis frame, WP suspension components, and potent Brembo braking systems. This model represents KTM's strong entry into the street bike market, building upon their off-road heritage with a focus on raw power and rider engagement. This comprehensive workshop service manual provides detailed information for the KTM 990 Super Duke, covering all aspects from routine maintenance to complex repairs. It includes in-depth procedures for engine overhaul, transmission, chassis, brakes, and the electrical system, along with specific guidance on fuel and bodywork. The manual is designed for both professional technicians and experienced DIY mechanics, offering step-by-step instructions, diagnostic troubleshooting, and essential torque specifications. Its factory-originated content ensures the highest accuracy and completeness, enabling owners to maintain and repair their vehicle effectively, saving on labor costs and preserving performance.