The 2006 Firebolt XB9R and XB12R represent a distinctive era in American sportbike engineering, blending aggressive styling with the raw power of V-twin engines. These motorcycles are characterized by their innovative chassis design, which integrates the fuel reservoir within the frame and the oil reservoir within the swingarm, contributing to a low center of gravity and exceptional handling. Key features include the Zero-Drag belt drive system, a powerful air-cooled V-twin engine available in 984cc (XB9) and 1203cc (XB12) displacements, and the 'Trilink' frame. This model was positioned to compete with European and Japanese sportbikes, offering a unique character and performance-oriented riding experience. This comprehensive service manual provides detailed guidance for the maintenance, repair, and troubleshooting of the 2006 Firebolt XB9R and XB12R. It covers all essential systems, including the engine, fuel injection, lubrication, cooling, transmission, drive belt, steering, suspension, and electrical components. The manual includes procedures for routine maintenance, engine rebuilds, component replacement, and diagnostic strategies for common issues. With detailed technical specifications, wiring diagrams, and step-by-step instructions, this resource is invaluable for owners, mechanics, and technicians seeking to preserve the performance and longevity of their Firebolt.