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Yamaha XS 850G

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

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.