XS 400 SE

1983 Yamaha XS 400 SE Technical Analysis & Specification Breakdown

Engineered by Yamaha for the naked motorcycle segment, the 1983 Yamaha XS 400 SE features a 392 cc (23.9 cu in) air-cooled twin, four-stroke configuration. In factory specification, peak output is rated at 27 HP (19.7 kW) at 7,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 68.9 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 XS 400 SE measures 178 kg (392 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.59 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 139 km/h (86 mph).

Within MotoLibrary's Yamaha archive, this model family spans 2 indexed model years from 1982 to 1983, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.