BT

1990 Tomos BT Technical Analysis & Specification Breakdown

Engineered by Tomos for the allround motorcycle segment, the 1990 Tomos BT pairs a 50 cc (3.1 cu in) air-cooled single cylinder, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 6 HP (4.4 kW), transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 120 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 BT measures 70 kg (154 lbs) dry, translating to a power-to-weight ratio of 0.09 HP/kg (11.67 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 90 km/h (56 mph).

Within MotoLibrary's Tomos archive, this model family spans 2 indexed model years from 1990 to 1991, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.