AS 3

1971 Yamaha AS 3 Technical Analysis & Specification Breakdown

At the heart of the 1971 Yamaha AS 3 naked motorcycle, Yamaha pairs a 125 cc (7.6 cu in) air-cooled twin, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 16 HP (11.7 kW) at 9,800 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 128 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 AS 3 measures 105 kg (231 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.56 kg per horsepower). The 9-liter (2.4 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 127 km/h (79 mph).

Within MotoLibrary's Yamaha archive, this model family spans 2 indexed model years from 1971 to 1972, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.