The Buell Firebolt XB12R, produced in 2005, represents a unique offering in the sportbike landscape, embodying the innovative spirit of its founder, Erik Buell. This model is distinguished by its aggressive styling, advanced engineering, and a performance-oriented design that integrates the frame as a fuel tank and the swingarm as an oil reservoir. Powered by an air-cooled, 45-degree V-twin Thunderstorm Engine displacing 1203 cc, the Firebolt XB12R delivers approximately 103 horsepower and 86 ft-lbs of torque, providing exhilarating performance for riders. Its chassis features a 43mm Showa upside-down front fork and an adjustable Showa rear shock absorber, coupled with signature D-Disc front braking system for potent stopping power. This comprehensive Factory Service Manual provides essential information for the maintenance, repair, and troubleshooting of the Buell Firebolt XB12R. Covering a wide range of systems including the engine, fuel system, chassis, drive/transmission, and electrical components, this 621-page English-language document is an indispensable resource for owners, enthusiasts, and independent repair shops. It details scheduled maintenance, fluid specifications, and specific procedures for tasks such as engine rebuilds, suspension servicing, and electrical diagnostics. The manual's extensive use of illustrations and diagrams, along with step-by-step instructions, ensures accurate and efficient upkeep, helping to preserve the vehicle's performance and longevity.