This manual covers the 950 Adventure and 990 Super Duke models from the 2003-2005 production years. These models, powered by V-Twin engines, exemplify this heritage. The 950 Adventure is recognized for its dual-purpose capability, adept at both on-road touring and off-road exploration, while the 990 Super Duke is a high-performance naked sportbike. Both models feature liquid-cooled V-Twin, 4-stroke engines with fuel injection and 6-speed manual transmissions, offering a potent combination of power and agility. This comprehensive workshop manual provides in-depth coverage of engine service, repair, and troubleshooting for these motorcycles. It includes detailed procedures for engine disassembly, assembly, component servicing, and complete engine rebuilds, supported by high-quality diagrams and exploded views. The manual also covers essential systems such as the fuel, ignition, cooling, lubrication, and exhaust systems, as well as the electrical system and common troubleshooting scenarios. Designed for both DIY enthusiasts and professional mechanics, this manual serves as an indispensable resource for maintaining and repairing your motorcycle, ensuring optimal performance and longevity.