The Honda CB650, produced from 1978 to 1985, represents a significant entry in the late 1970s and early 1980s middleweight motorcycle market. Available in standard and Custom variants, this series, including models designated RC03 and RC05, is characterized by its smooth, air-cooled inline-four engine, comfortable ergonomics, and the renowned reliability of Honda engineering. As a competitor to other four-cylinder middleweights of its era, the CB650 series offered a compelling blend of performance and rider comfort, making it a popular choice for enthusiast owners and a solid platform for restoration specialists.

This comprehensive workshop service and repair manual provides detailed guidance for owners and technicians working on the Honda CB650 models from 1978 through 1985. Covering everything from routine maintenance and adjustments to complete engine and transmission rebuilds, the manual offers step-by-step instructions, diagnostic flowcharts, and technical specifications. Key areas include in-depth engine and fuel system overhauls, transmission and clutch service, electrical system troubleshooting, suspension and brake maintenance, and frame and bodywork procedures. With over 300 pages of information, including detailed diagrams and wiring schematics, this manual is an essential resource for ensuring the longevity and optimal performance of your CB650.