XS 400 DOHC (reduced effect)

1982 Yamaha XS 400 DOHC (reduced effect) Technical Analysis & Specification Breakdown

At the heart of the 1982 Yamaha XS 400 DOHC (reduced effect) naked motorcycle, Yamaha relies on a 399 cc (24.4 cu in) air-cooled twin, four-stroke powerplant. In factory specification, peak output is rated at 27 HP (19.7 kW) at 8,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 67.7 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 DOHC (reduced effect) measures 187 kg (412 lbs) wet (curb), translating to a power-to-weight ratio of 0.14 HP/kg (6.93 kg per horsepower). The 18-liter (4.8 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 143 km/h (89 mph).

Within MotoLibrary's Yamaha archive, this model family spans 7 indexed model years from 1982 to 1988, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.