GS 400

1977 Suzuki GS 400 Technical Analysis & Specification Breakdown

At the heart of the 1977 Suzuki GS 400 classic motorcycle, Suzuki pairs a 398 cc (24.3 cu in) air-cooled twin, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 27 HP (19.7 kW) at 7,400 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 67.8 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 GS 400 measures 185 kg (408 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.85 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 150 km/h (93 mph).

Within MotoLibrary's Suzuki archive, this model family spans 2 indexed model years from 1976 to 1977, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.