This manual covers the Firebolt XB9R and XB12R models produced between 2005 and 2008. Known for their distinctive engineering and performance, these motorcycles feature a 45-degree V-twin Thunderstorm engine, available in 984 cc (XB9) and 1203 cc (XB12) displacements. Innovations include the ZTL front brake system with a 6-piston caliper and 375mm rotor, and a frame that doubles as an oil reservoir. The XB series represents a commitment to sportbike performance and unique design, offering a powerful riding experience for enthusiasts. This comprehensive workshop manual provides in-depth service and repair information for all major systems of the Firebolt XB9R and XB12R. It includes detailed procedures for engine overhaul, transmission, clutch, cooling, fuel, ignition, electrical, braking, steering, suspension, and frame components, along with high-quality pictures and diagrams. The manual is designed to assist DIY mechanics, professional technicians, and owners in performing scheduled maintenance, troubleshooting common issues, and carrying out complex repairs and rebuilds, ensuring optimal performance and longevity of the vehicle.