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Yamaha XS 850G

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Make Model

Yamaha XS 850G

Year

1980

Engine

Four stroke, transverse three cylinder, DOHC, 2 valves per cylinder

Capacity

826 cc / 50.4 cu in
Bore x Stroke 71.5 x 68.6 mm
Compression Ratio 9.2:1
Cooling System Air cooled

Induction

3 x 34mm Hitachi carburetors

Ignition

Battery powered triggered

Starting

Electric

Max Power

57.7 kW / 79 hp @ 8500 rpm

Transmission

5 Speed

Final Drive

Shaft

Front Suspension

Air assisted telescopic forks

Front Wheel Travel

175 mm / 6.9 in

Rear Suspension

Swing arm 4-way adjustable damping

Rear Wheel Travel

99 mm / 3.9 in

Front Brakes

2 x 267mm Discs, 1 piston calipers

Rear Brakes

Single 267mm disc, 1 piston caliper

Front Tyre

3.25-19

Rear Tyre

4.00-18

Wet Weight

258 kg / 569 lbs

Fuel Capacity 

24 Litres / 6.3 US gal

Standing ¼ Mile

13.3 sec / 158 km/h / 98.2 mph

Road Test

Motor Cycling 1980

Two Wheels 1980

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Two years into its short life, the XS750 had lost much of its early reputation as a high-performer: still having better-than-average handling, for the cc class, the three had been overtaken in the horse-
power race by developments among 750-4s from the other manufacturers.

For 1980 Yamaha overbored the 750 by 3mm to achieve 826cc, and in the XS850 were able to offer a three that was fully a match for any similar-capacity four, and not a few 1000s.

The extra power of the 850 was not, of course, the result simply of additional volume; the original cams had been reworked for more lift and dwell, the carburettors increased in size to 32mm (and the make changed, from Mikuni to Hitachi), the crankshaft strengthened.

The gearbox was beefed up, and a large Hi-Vo chain installed for primary drive.
A preload-adjustable front fork and rear units with normal five-position setting gave handling that was at least as good as that of the lower-powered 750 . . . significant achievement in view of th 125mph potential of the new model.