500 S Desmo

1977 Ducati 500 S Desmo Technical Analysis & Specification Breakdown

Engineered by Ducati for the sport motorcycle segment, the 1977 Ducati 500 S Desmo relies on a 497 cc (30.3 cu in) air-cooled twin, four-stroke powerplant. In factory specification, peak output is rated at 43 HP (31.4 kW) at 8,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 86.5 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 500 S Desmo measures 186 kg (410 lbs) wet (curb), translating to a power-to-weight ratio of 0.23 HP/kg (4.33 kg per horsepower). The 19-liter (5 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 180 km/h (112 mph).

Within MotoLibrary's Ducati archive, this model family spans 2 indexed model years from 1977 to 1978, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.