Golden Flash
1959 BSA Golden Flash Technical Analysis & Specification Breakdown
Positioned in BSA's allround motorcycle lineup, the 1959 BSA Golden Flash utilizes a 646 cc (39.4 cu in) air-cooled twin, four-stroke layout. In factory specification, peak output is rated at 35 HP (25.5 kW) at 4,500 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 54.2 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the Golden Flash measures 190 kg (419 lbs) dry, translating to a power-to-weight ratio of 0.18 HP/kg (5.43 kg per horsepower). The 19-liter (5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's BSA archive, this model family spans 8 indexed model years from 1954 to 1961, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
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