The Yamaha XS1100SF Special is a four-stroke transverse four-cylinder motorcycle produced in 1979. It has a four-valve per cylinder and an air-cooled engine with a 1101cc capacity. The bike has a compression ratio of 9.2:1 and uses a 4x Mikuni BS 34SS Carburettor induction system.
The XS1100SF Special has a wet sump lubrication system, a TCI ignition, and uses a BP6ES (NGK) or N-8Y (Champion) spark plug. The motorcycle also features a GM 18Z-3A / 12v, 20 AH battery and an AC generator with a voltage regulator and rectifier.
The XS1100SF Special has a maximum power of 95 hp / 70.8 kW @ 8500 rpm and a max torque of 9.2 kgf-m / 66.5 lb-ft @ 6500 rpm. It uses a 5 speed transmission and a shaft final drive. The motorcycle also features telescopic fork front suspension and preload adjustable dual shocks swing arm rear suspension.
The XS1100SF Special has front and rear disc brakes with a wet weight of 258 kg / 568.7 lbs. It has a fuel capacity of 15 Litres / 3.9 US gal and consumes an average of 40.3 mpg. The motorcycle has a top speed of 126 mph / 202.8 km/h and can brake 100-0 in 39.7 m, completing a standing quarter-mile in 11.7 seconds at a speed of 114.2 mph / 183.8 km/h.
Technical specifications:
Make Model: Yamaha XS 1100SF Special
| Year | 1979 |
|---|---|
| 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 | 4.50-16 |
| 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 |
