| MODEL | TRIUMPH T 140D 750 B 1981 |
| Year | 1981 |
| Engine Type | Four-stroke, parallel twin, OHV, 2 valves per cylinder |
| Displacement / Capacity | 744 cc / 45.4 cu in |
| Bore X Stroke | 76 x 82 mm |
| Compression Ratio | 8.6:1 |
| Cooling System | Air cooled |
| Max Power | 40.3 kW / 54 hp @ 6200 rpm |
| Max Torque | 56.6 Nm / 5.77 kgf-m / 41.8 ft-lb @ 5500 rpm |
| Ignition | Battery / dual coil / dual points / Lucas |
| Induction | 2 x 30 mm Amal carburetors |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 Speed |
| Clutch | Wet, multiplate |
| Final Drive | Chain, 106 links |
| CHASSIS SPECS | |
| Frame | Tubular steel, double front downtubes, oil bearing large tube backbone |
| Front Suspension | Telescopic forks |
| Rear Suspension | Swingarm, Girling shocks, 3-way spring preload adjustable |
| Front Brakes | Single 254 mm disc, 1 piston caliper |
| Rear Brakes | Single 254 mm disc, 1 piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2220 mm / 87.5 in |
| Overall Width | 840 mm / 33.0 in |
| Overall Height | — |
| Seat Height | 813 mm / 32.0 in |
| Wheelbase | 1422 mm / 56 in |
| Ground Clearance | — |
| Dry Weight | 200 kg / 441 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.25-19 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 18.2 Litres / 4.8 US gal / 4.0 Imp gal |
| Fuel Consumption | 5.5 L/100 km / 18 km/l / 42 US mpg / 51 Imp mpg |
| Top Speed | 190 km/h / 118 mph |
A 1981 listing of the T140D Special-style Bonneville, with the same 744 cc air-cooled twin and five-speed gearbox as earlier T140s. Specifications on the source page are identical to the 1979-80 entry.
