SM 750 (with sidecar)

1989 Donghai SM 750 (with sidecar) Technical Analysis & Specification Breakdown

Built around Donghai's classic motorcycle platform, the 1989 Donghai SM 750 (with sidecar) features a 745 cc (45.5 cu in) air-cooled twin, four-stroke configuration. In factory specification, peak output is rated at 26 HP (19 kW) at 4,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 34.9 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 SM 750 (with sidecar) measures 400 kg (882 lbs) wet (curb), translating to a power-to-weight ratio of 0.07 HP/kg (15.38 kg per horsepower). The 25-liter (6.6 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 119 km/h (74 mph).

Within MotoLibrary's Donghai archive, this model family spans 3 indexed model years from 1987 to 1990, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.