KS 125 Sport

1975 Zündapp KS 125 Sport Technical Analysis & Specification Breakdown

At the heart of the 1975 Zündapp KS 125 Sport classic motorcycle, Zündapp relies on a 124 cc (7.6 cu in) air-cooled single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 17 HP (12.4 kW) at 7,600 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 137.1 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 KS 125 Sport measures 116 kg (256 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.82 kg per horsepower). The 14-liter (3.7 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 125 km/h (78 mph).

Within MotoLibrary's Zündapp archive, this model family spans 7 indexed model years from 1971 to 1977, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.