650 D - 650 SR

1978 Kawasaki 650 D - 650 SR Technical Analysis & Specification Breakdown

Engineered by Kawasaki for the custom - cruiser motorcycle segment, the 1978 Kawasaki 650 D - 650 SR features a 652 cc (39.8 cu in) air-cooled in-line four, four-stroke configuration. In factory specification, peak output is rated at 64 HP (46.7 kW) while maximum torque reaches 5.8 Nm (4.3 lb-ft), transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 98.2 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 650 D - 650 SR measures 219 kg (483 lbs) wet (curb), translating to a power-to-weight ratio of 0.29 HP/kg (3.42 kg per horsepower). Rider ergonomics and chassis geometry center around a 800 mm (31.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,437 mm (56.6 in) wheelbase engineered for balanced agility and highway composure. The 16.6-liter (4.4 US gal) fuel tank paired with a rated consumption of 16.8 L/100 km provides an estimated theoretical range of roughly 99 km (62 miles) between fill-ups, while factory top speed is listed at 186 km/h (116 mph).