Triumph Bonneville 750 T140D (1979-80)

The Triumph Bonneville 750 T140D motorcycle was produced between 1979 and 1980. Its engine is a four-stroke, parallel twin with two valves per cylinder, and a capacity of 744 cc or 45.4 cubic inches. The compression ratio is 8.6:1, and it has air-cooling and 2 x 30mm Amal carburetors. The ignition is battery-powered and has Lucas dual coils and dual points. The motorcycle can be started with a kick or an electric starter. Its maximum power output is 40.3 kW or 54 hp at 6200 rpm, and the maximum torque is 56.6 Nm or 5.77 kgf-m or 41.8 ft-lb at 5500 rpm. The clutch system is wet and multi-plate, and the transmission has five speeds. The final drive is chain-operated with 106 links. The frame is made of tubular steel and has double front downtubes and an oil-bearing large tube backbone. The front suspension is telescopic forks, and the rear suspension is swingarm with Girling shocks that are three-way spring preload adjustable. The motorcycle has a single 254 mm disc brake with a single piston caliper for the front and rear wheels. The front and rear tire sizes are 3.25-19 and 4.00-18, respectively. The rake angle is 28o, the trail is 109 mm or 4.3 in, and the wheelbase is 1422 mm or 56 in. The length, width, and seat height are 2220 mm or 87.5 in, 840 mm or 33.0 in, and 813 mm or 32.0 in, respectively. It has a dry weight of 200 kg or 441 lbs and a fuel capacity of 18.2 liters or 4.8 US gallons or 4.0 Imperial gallons. The motorcycle consumes 5.5 L/100 km or 18 km/L or 42 US mpg or 51 Imp mpg and can reach a maximum speed of 190 km/h or 118 mph.

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Technical specifications:

Make Model: Triumph Bonneville 750 T140D

Year: 1979 – 80

Engine: Four stroke, parallel twin, OHV, 2 valves per cylinder

Capacity: 744 cc / 45.4 cu in

Bore x Stroke: 76 x 82 mm

Compression Ratio: 8.6:1

Cooling System: Air cooled

Induction: 2 x 30 mm Amal carburetors

Ignition: Battery / dual coil / dual points / Lucas

Starting: Electric and kick

Max Power: 40.3 kW / 54 hp @ 6200 rpm

Max Torque: 56.6 Nm / 5.77 kgf-m / 41.8 ft-lb @5500 rpm

Clutch: Wet, multiplate

Transmission: 5 Speed

Final Drive: Chain, 106 links

Gear Ratios: 1st 12.25 / 2nd 8.63 / 3rd 6.58 / 4th 5.59 / 5th 4.70:1

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

Front Tyre: 3.25-19

Rear Tyre: 4.00-18

Rake: 28o

Trail: 109 mm / 4.3 in

Wheelbase: 1422 mm / 56 in

Dimensions: Length: 2220 mm / 87.5 in Width: 840 mm / 33.0 in

Seat Height: 813 mm / 32.0 in

Dry Weight: 200 kg / 441 lbs

Fuel Capacity: 18.2 Litres / 4.8 US gal / 4.0 Imp gal

Consumption: 5.5 L/100 km / 18 km/l / 42 US mpg / 51 Imp mpg

Top Speed: 190 km/h / 118 mph