Jupiter 4

1985 IZH Jupiter 4 Technical Analysis & Specification Breakdown

Built around IZH's naked motorcycle platform, the 1985 IZH Jupiter 4 pairs a 350 cc (21.4 cu in) air-cooled twin, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 27 HP (19.7 kW) at 6,000 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 77.1 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 Jupiter 4 measures 180 kg (397 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.67 kg per horsepower). The 17-liter (4.5 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 IZH archive, this model family spans 4 indexed model years from 1984 to 1987, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.