CB 650

1981 Honda CB 650 Technical Analysis & Specification Breakdown

At the heart of the 1981 Honda CB 650 classic motorcycle, Honda utilizes a 627 cc (38.3 cu in) air-cooled in-line four, four-stroke layout. In factory specification, peak output is rated at 63 HP (46 kW) at 9,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 100.5 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the CB 650 measures 216 kg (476 lbs) wet (curb), translating to a power-to-weight ratio of 0.29 HP/kg (3.43 kg per horsepower). The 18-liter (4.8 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 183 km/h (114 mph).

Within MotoLibrary's Honda archive, this model family spans 5 indexed model years from 1978 to 1982, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.