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Yamaha XS 1100 Sport

Model	Yamaha XS 1100 Sport
Year	1981
Engine	Four stroke transverse four cylinder, DOHC, 2 valves per cylinder.
Capacity	1101 cc / 67.2 cu-in
Bore x Stroke	71.5 x 68.6 mm
Cooling System	Air cooled
Compression Ratio	9.2:1
Induction	4x Mikuni BS 34SS Carburettor
Lubrication	Wet sump
Ignition	TCI additional vacuum adjusted! / electric kick starter - Witch is separated from the engine, for emergency mounting only
Spark Plug	BP6ES (NGK) or N-8Y (Champion)
Battery	GM 18Z-3A / 12v, 20 AH
Generator	A.C. Generator, voltage regulator, rectifier
Starting	Electric
Max Power	95 hp / 70.8 kW @ 8500 rpm
Max Torque	9.2 kgf-m / 66.5 lb-ft @ 6500 rpm
Clutch	Wet, multi-disc (8 drive plates, 7 driven plates)
Transmission	5 Speed
Primary Reduction System	HY-VO chain & gear
Primary Reduction Ratio	25/25 x 58/35 = 1.657
Final Drive	Shaft
Gear Ratio	1st 38/17 (2.235) 2nd 39/24 (1.625) 3rd 36/28 (1.286) 4th 32/31 (1.032) 5th 30/34 (0.882)
Front Suspension	Telescopic fork.
Front Wheel Travel	175 mm / 6.8 in
Rear Suspension	Dual shocks Swing arm, preload adjustable
Rear Wheel Travel	80 mm / 3.1 in
Front Brakes	2x 298mm discs
Rear Brakes	Single 298mm disc
Front Tyre	3.50-19
Rear Tyre	4.50-17
Rake	29º 30
Trail	130 mm / 5.1 in
Seat Height	800 mm / 31.5 in
Wet Weight	258kg / 568.7 lbs
Fuel Capacity	22 Litres / 5.8 gal

After the XS1100, the XS1100. (In some circles it is known as 'Sport'; however you call it there is no difficulty in distinguishing it from the early model, for it has an all-black finish and a small fairing, or big cowling, around the headlamp.)

Brought into Europe for the 1981 season, this big Yamaha was fundamentally unchanged from the original. The engine still put out 95bhp but handling, claimed the makers, had been improved with new rear-suspension units with four-way damping control, and a leading-axle front fork using air pressure up to 15psi. New too on this latest 'Excess' were what Yamaha called italic-spoke wheels, in which the spokes are curved to promote a 'look fast when standing still' look.

After the XS1100 — the XS1100 Sport, dis finish, headlamp cowling and air-assisted, 1981
Testers complained that the fairing caused turbulence, resulting in a disturbed ride at over 100mph. It is difficult, of course, to make a 6001b two-wheeler nimble as well as fast; but other makers, with late designs, got further along this path than Yamaha with this basically mid-1970s big four.