This manual provides comprehensive service and repair information for the KTM 950 Adventure and 990 Super Duke motorcycles, specifically focusing on their LC8 V-Twin engines from the 2003-2005 production years. These Austrian-engineered motorcycles are renowned for their robust performance and adventurous capabilities. The LC8 engine, a powerful 4-stroke V-twin, delivered impressive horsepower and torque, making these models suitable for both demanding off-road excursions and spirited street riding. The 950 Adventure established itself as a capable dual-sport machine, while the 990 Super Duke variant highlighted the engine's performance potential in a naked sportbike format. This 273-page English-language service repair manual is designed to guide owners and technicians through all aspects of engine maintenance, diagnosis, and repair. It covers essential procedures such as engine removal and refitting, complete disassembly and assembly, component servicing, and troubleshooting for both fuel injection and carburetor systems. Detailed sections on electrical systems, lubrication, cooling, and transmission, along with comprehensive torque specifications and wiring diagrams, ensure accurate and efficient work. The manual's high-resolution format, featuring searchable text and bookmarks, facilitates easy navigation and access to critical information, empowering users to maintain their KTM motorcycles effectively.