Yamaha XS400: history, specs, pictures

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Yamaha XS400
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
Class Standard
Predecessor Yamaha XS360
twin, four-stroke
Bore / Stroke 69.0mm x 53.4mm
Top Speed 89 mph (143 km/h)
Horsepower 26.42 HP (19.7 KW) @ 8000RPM
Fuel System Carburetor
Spark Plug 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
Final Drive Chain: 530x100
Front Sprocket 16T
Rear Sprocket 35T
Brakes Front: single disc
Rear: expanding brake
Front Tire 3.00-18
Rear Tire 4.00-18
Weight 187.0 kg (wet)
Oil Filter K&N KN-144[1]
Recommended Oil Yamalube 10w-40
Fuel Capacity 4.76 Gallon (18.00 Liters)
Competition Honda CM400
Kawasaki KZ400C
Manuals Service Manual

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[edit | edit source]

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[edit | edit source]

The bike has a 6-speed transmission.

Chassis[edit | edit source]

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.

1977[edit | edit source]

1982 - 1988 Yamaha XS 400[edit | edit source]

It is a bike with a 399cc engine which develops a power of 45 horses at 9500rpm and can reach a top speed of 168 km/h.

In Media[edit | edit source]

References[edit | edit source]

  1. 2019 K&L Supply Co Catalog. K&L Supply Co. 2019.