CB 650 SC Nighthawk
1983 Honda CB 650 SC Nighthawk Technical Analysis & Specification Breakdown
Built around Honda's sport touring motorcycle platform, the 1983 Honda CB 650 SC Nighthawk utilizes a 655 cc (40 cu in) oil & 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 6-speed gearbox and shaft drive (cardan) final drive. With a specific output of 96.2 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 SC Nighthawk measures 197 kg (434 lbs) dry, translating to a power-to-weight ratio of 0.32 HP/kg (3.13 kg per horsepower). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,461 mm (57.5 in) wheelbase engineered for balanced agility and highway composure. The 12.86-liter (3.4 US gal) fuel tank paired with a rated consumption of 5.88 L/100 km provides an estimated theoretical range of roughly 219 km (136 miles) between fill-ups.
Within MotoLibrary's Honda archive, this model family spans 2 indexed model years from 1983 to 1984, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Without doubt the new CB650´s most impressive features are its valve-lash adjustment and its low-maintenance design. Honda engineers seemto have removed the last tedious, time-consuming ritual from motorcycling´s Saturday afternoon Here is a machine that fulfills the 650 promise: it feels small, smaller than a 750, yet runs with 750s without even breathing hard. Its smoothness and comfort invite long rides. The rear suspension´s springing and damping rates do need tuning to provide a more supple ride; and for sporting riders, Honda´s engineering department should attend to the drive line´s irksome lash and shaft reaction. Having a motorcycle that needs barely more maintenance than a safetypin is a bargain only if its owner genuinely enjoys the way the motorcycle works. Diehards may complain sourly about ´appliance-like´ character, but few riders will quarrel with the way this motorcycle functions. For about six or seven years, first one manufacturer and then another has proclaimed that its 650s perform like 750s; certainly there´s been much sound to this proclamation but little real 750 fury. Now the 650 Nighthawk delivers. Everyone who has ridden the 650 Nighthawk has come back impressed. This 650 is the new measuring standard of the 40-inch class. And the standard has just been raised. A lot.
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