Built around Yamaha's classic motorcycle platform, the 1982 Yamaha XS 400 relies on a 392 cc (23.9 cu in) air-cooled twin, four-stroke powerplant. In factory specification, peak output is rated at 27 HP (19.7 kW) at 7,000 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 measures 182 kg (401 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.74 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 143 km/h (89 mph).
Within MotoLibrary's Yamaha archive, this model family spans 5 indexed model years from 1978 to 1982, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
68.9 HP/L
Power-to-Weight
0.15 HP/kg (6.74 kg/HP)
Engine
Displacement392.0 ccm (23.92 cubic inches)
Engine TypeTwin, four-stroke
Engine DetailsTwin, four-stroke
Power27.0 HP (19.7 kW)) @ 7000 RPM
Compression9.2:1
Bore x Stroke69.0 x 52.4 mm (2.7 x 2.1 inches)
Valves/Cylinder2
Fuel SystemCarburettor. 2 x 3 2 mm Mikuni
Fuel ControlOverhead Cams (OHC)
IgnitionTransistorized
LubricationWet sump
CoolingAir
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet, multiplate
Performance
Top Speed143.2 km/h (89.0 mph)
Chassis
Rake27.0°
Trail95 mm (3.7 inches)
Front SuspensionHydraulic telescopic forks
Rear SuspensionMonocross system with single coil sprung, gas/oil damped shock, pre-load adjustable
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
