Yamaha XS850: review, history, specs

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Yamaha XS850
Also called XS 850
Production 1980 - 1982
Class Standard
Predecessor Yamaha XS750
in-line three, four-stroke
Bore / Stroke 71.5mm x 68.6mm
Compression ratio 9.2:1
Top Speed 122 mph (196 km/h)
Horsepower 77.38 HP (57.7 KW) @ 8500RPM
Air Filter K&N YA-1300 `80-81[1]
Spark Plug NGK BP7ES '80-81
Battery YUASA YB14L-A2 '80-81
Transmission Gear box: 5-speed
Final Drive: shaft drive (cardan)
Final Drive Shaft
Suspension Front: Telescopic Forks
Rear: Swing Arm
Brakes Front: dual disc
Rear: single disc
Front Tire 3.25-19
Rear Tire 4.00-18
Weight 258.0 kg (wet)
Oil Filter K&N KN-146
Recommended Oil Yamalube 10w-40
Fuel Capacity 6.34 Gallon (24.00 Liters)
Related Yamaha XS750
Manuals Service Manual

The Yamaha XS850 was a in-line three, four-stroke Naked motorcycle produced by Yamaha between 1976 and 1982. It could reach a top speed of 122 mph (196 km/h). Claimed horsepower was 77.38 HP (57.7 KW) @ 8500 RPM.

History[edit | edit source]

Made in the US from 80-81 Also offered in Europe in 80-82 This is an evolved version of the XS750 (a shaft drive, 2 valve per cylinder, 3 cylinder, 4 stroke) which was basically bored out in 1980 to become the 850.

Offered as

  • XS850G 80 Standard UJM
  • XS850SG 80 Special
  • XS850LG 80 Midnight Special
  • XS850H 81 Standard UJM
  • XS850SH 81 Special
  • XS850LH 81 Midnight Special

Information and a forum following is the same as for the XS750.

Engine[edit | edit source]

The engine was a air cooled in-line three, four-stroke. A 71.5mm bore x 68.6mm stroke result in a displacement of just 826.0 cubic centimeters. Fuel was supplied via a double overhead cams/twin cam (dohc).

Drive[edit | edit source]

The bike has a 5-speed transmission.

Chassis[edit | edit source]

It came with a 3.25-19 front tire and a 4.00-18 rear tire. Stopping was achieved via dual disc in the front and a single disc in the rear. The front suspension was a Telescopic Forks while the rear was equipped with a Swing Arm. The XS850 was fitted with a 6.34 Gallon (24.00 Liters) fuel tank.

1980 - 1982 Yamaha XS 850[edit | edit source]

1976 - 1980 Yamaha XS 850

References[edit | edit source]

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