Tornado 650 S

1973 Benelli Tornado 650 S Technical Analysis & Specification Breakdown

Engineered by Benelli for the classic motorcycle segment, the 1973 Benelli Tornado 650 S features a 643 cc (39.2 cu in) air-cooled twin, four-stroke configuration. In factory specification, peak output is rated at 45 HP (32.8 kW) at 6,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 70 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the Tornado 650 S measures 222 kg (489 lbs) wet (curb), translating to a power-to-weight ratio of 0.2 HP/kg (4.93 kg per horsepower). The 12.5-liter (3.3 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 175 km/h (109 mph).

Within MotoLibrary's Benelli archive, this model family spans 5 indexed model years from 1972 to 1976, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.