The 2006 FLHRSI Road King Custom represents a refined offering within the iconic American motorcycle manufacturer's touring lineage. Known for its distinctive styling, often featuring a lower profile and unique aesthetic elements, this model is engineered for comfortable long-distance riding. It is powered by the robust Twin Cam 96 V-Twin engine, delivering reliable performance and the characteristic rumble associated with the brand. The Road King Custom combines classic design with practical touring capabilities, making it a popular choice for riders who appreciate both heritage and function. This comprehensive service and repair manual provides detailed guidance for the 2006 FLHRSI Road King Custom. It covers all essential aspects of the motorcycle, including the Twin Cam 96 engine, electronic sequential port fuel injection, 5-speed Cruise Drive transmission, chassis, braking, and electrical systems. The manual offers step-by-step instructions for routine maintenance, component repair, disassembly, and assembly, alongside crucial troubleshooting procedures and technical specifications. This resource is designed to assist professional technicians and do-it-yourself mechanics in maintaining the optimal performance and longevity of their motorcycle.