This manual covers the Honda CB400 and CM400 models produced between 1978 and 1981. These motorcycles are powered by an air-cooled, 4-stroke, SOHC parallel-twin engine with a displacement of 395 cc. The CB400 features a standard riding posture, while the CM400 offers a cruiser-style design. Both models were available with a 5-speed manual transmission or a 2-speed automatic transmission. Known for signature reliability and engineering quality, these bikes were popular for their smooth power delivery and versatile performance, appealing to both commuters and recreational riders.

This comprehensive factory service manual provides detailed technical information essential for the maintenance and repair of your Honda CB400 or CM400. It covers a wide range of systems, including the engine, drivetrain, chassis, suspension, and electrical components. Specific procedures for routine maintenance, tune-ups, troubleshooting common issues, and complete component overhauls are thoroughly explained. With clear instructions and diagrams, this manual is an indispensable resource for owners and technicians seeking to preserve the performance and longevity of these classic motorcycles.