LI 125 Series 1

1958 Lambretta LI 125 Series 1 Technical Analysis & Specification Breakdown

At the heart of the 1958 Lambretta LI 125 Series 1 scooter motorcycle, Lambretta relies on a 123 cc (7.5 cu in) air-cooled single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 5.2 HP (3.8 kW) at 5,200 rpm, transferring power to the rear wheel through a 4-speed gearbox. With a specific output of 42.3 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 LI 125 Series 1 measures 103.9 kg (229 lbs) dry, translating to a power-to-weight ratio of 0.05 HP/kg (19.98 kg per horsepower).

Within MotoLibrary's Lambretta archive, this model family spans 2 indexed model years from 1958 to 1959, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.