Yamaha XS400: history, specs, pictures

**Yamaha XS400**
Manufacturer	Yamaha
Also called	XS400 US. Custom, XS 400 US. Custom, XS400SE, XS 400 SE, XS400 DOHC (reduced effect), XS 400 DOHC (reduced effect), XS400 DOHC, XS 400 DOHC, XS400 Special, XS 400 Special, XS 400
Production	1978 - 1990
Predecessor	Yamaha XS360
Class	Standard
Engine	twin, four-stroke
Bore / Stroke	69.0mm x 53.4mm
Top speed	89 mph (143 km/h)
Horse Power	26.42 HP (19.7 KW) @ 8000RPM
Fuel system	Carburetor
Sparkplug	NGK BP7ES '77 , '78 , '78-79 , '79; NGK D8EA '82-83
Battery	YUASA 12N12A-4A-1 '77 , '78 , '78-79 , '79 , '82-83
Transmission	Gear box: 6-speed ; Final Drive: chain ;
Brakes	Front: single disc ; Rear: expanding brake
Front Tire	3.00-18
Rear Tire	4.00-18
Weight	(dry), 187.0 kg (wet)
Fuel capacity	4.76 Gallon (18.00 Liters)
Manuals	Service Manual
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The Yamaha XS400 DOHC was a twin, four-stroke Naked motorcycle produced by Yamaha between 1978 and 1990. It could reach a top speed of 89 mph (143 km/h). Claimed horsepower was 26.42 HP (19.7 KW) @ 8000 RPM.

Engine

The engine was a air cooled twin, four-stroke. A 69.0mm bore x 53.4mm stroke result in a displacement of just 399.0 cubic centimeters. Fuel was supplied via a double overhead cams/twin cam (dohc).

Drive

The bike has a 6-speed transmission.

Chassis

It came with a 3.00-18 front tire and a 4.00-18 rear tire. Stopping was achieved via single disc in the front and a expanding brake in the rear. The XS400 DOHC was fitted with a 4.76 Gallon (18.00 Liters) fuel tank.