A 75 Rocket 3

1971 BSA A 75 Rocket 3 Technical Analysis & Specification Breakdown

Built around BSA's classic motorcycle platform, the 1971 BSA A 75 Rocket 3 relies on a 740 cc (45.2 cu in) air-cooled in-line three, four-stroke powerplant. In factory specification, peak output is rated at 58 HP (42.3 kW) at 7,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 78.4 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 A 75 Rocket 3 measures 226 kg (498 lbs) wet (curb), translating to a power-to-weight ratio of 0.26 HP/kg (3.9 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 185 km/h (115 mph).

Within MotoLibrary's BSA archive, this model family spans 3 indexed model years from 1970 to 1972, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.