General information
Model:	Yamaha XS 400
Year:	1978
Category:	Naked bike
Engine and transmission
Displacement:	392.00 ccm (23.92 cubic inches)
Engine type:	Twin
Stroke:	4
Power:	27.00 HP (19.7 kW)) @ 7000 RPM
Compression:	9.2:1
Bore x Stroke:	69.0 x 52.4 mm (2.7 x 2.1 inches)
Valves per cylinder:	2
Fuel control:	OHC
Cooling system:	Air
Gearbox:	6-speed
Transmission type final drive:	Chain
Physical measurements
Weight incl. oil, gas, etc:	182.0 kg (401.2 pounds)
Chassis and dimensions
Front tyre dimensions:	3.00-18
Rear tyre dimensions:	3.75-18
Front brakes:	Single disc
Rear brakes:	Expanding brake
Speed and acceleration
Top speed:	140.0 km/h (87.0 mph)
Other specifications
Fuel capacity:	17.00 litres (4.49 gallons)