T 140 E Bonneville Special

1981 Triumph T 140 E Bonneville Special Technical Analysis & Specification Breakdown

Built around Triumph's motorcycle platform, the 1981 Triumph T 140 E Bonneville Special utilizes a 744 cc (45.4 cu in) air-cooled twin, four-stroke layout. In factory specification, peak output is rated at 49 HP (35.8 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 65.9 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 T 140 E Bonneville Special measures 200 kg (441 lbs) wet (curb), translating to a power-to-weight ratio of 0.25 HP/kg (4.08 kg per horsepower). The 18.5-liter (4.9 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 160 km/h (99 mph).

Within MotoLibrary's Triumph archive, this model family spans 2 indexed model years from 1980 to 1981, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.