| MODEL | YAMAHA XS 1100SF SPECIAL 1979 |
| Year | 1979 |
| Engine Type | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder |
| Displacement / Capacity | 1101 cc / 67.2 cu in |
| Bore X Stroke | 71.5 x 68.6 mm |
| Compression Ratio | 9.2:1 |
| Cooling System | Air cooled |
| Max Power | 70.8 kW / 95 hp @ 8500 rpm |
| Max Torque | 90 Nm / 66.5 lb-ft @ 6500 rpm |
| Ignition | TCI, vacuum advance |
| Induction | 4 x 34 mm Mikuni BS34SS carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 5 Speed |
| Clutch | Wet, multi-disc (8 drive plates, 7 driven plates) |
| Final Drive | Shaft |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic fork, 175 mm / 6.9 in travel |
| Rear Suspension | Dual shocks, swingarm, preload adjustable, 80 mm / 3.1 in travel |
| Front Brakes | 2 x 298 mm discs |
| Rear Brakes | Single 298 mm disc |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 258 kg / 568.7 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.50-19 |
| Rear Tyre | 130/90-16 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 3.9 US gal |
| Fuel Consumption | 40.3 mpg (average) |
| Top Speed | 202.8 km/h / 126 mph |
The Special was the US-market custom-styled XS Eleven, with pullback bars, a stepped seat, a 16 in rear wheel and a smaller teardrop tank. The engine was unchanged from the touring model, though testers noted slightly softer performance from emissions jetting. Cycle World judged it no improvement over the original.
