Yamaha XS1100SF Midnight Special (1980)

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The Yamaha XS1100SF Midnight Special is a 1980 motorcycle with a four-stroke transverse four-cylinder engine, DOHC, and two valves per cylinder. It has a 1101 cc capacity and a compression ratio of 9.2:1. The bike uses 4 Mikuni BS 34SS Carburettors for induction and has a wet sump for lubrication. The ignition is TCI and has an electric kickstarter which is separate from the engine for emergency mounting only. The bike uses a wet multi-disc clutch and has a 5-speed transmission with a final drive shaft. The front suspension is a telescopic fork with 175 mm wheel travel and the rear suspension is dual shocks swing arm with preload adjustable and 80 mm wheel travel. The front brakes have 2x 298mm discs and the rear brake has a single 298mm disc. The bike has a 15 litre fuel capacity and can average 40.3 mpg. The Yamaha XS1100SF Midnight Special has a top speed of 126 mph and can cover a standing 1/4 mile in 11.7 seconds at a speed of 114.2 mph. The bike has a wet weight of 258 kg and a fuel consumption rate of 3.9 US gallons. Overall, it is a popular motorcycle with a max power output of 95 hp and a torque of 9.2 kgf-m.

Technical specifications:

Make Model: Yamaha XS 1100LG Special

Year: 1980


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: 130/90 -16
Rake: 29 o 30
Trail: 130 mm / 5.1 in
Wet Weight: 258 kg / 568.7 lbs
Fuel Capacity: 15 Litres / 3.9 US gal
Consumption Average: 40.3 mpg
Braking 100 – 0: 39.7 m
Standing 1/4 Mile: 11.7 sec / 114.2 mph 183.8 km/h

Top Speed: 126 mph / 202.8 km/h

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