Triumph Bonneville 750 T140 (1973-78)

The Triumph Bonneville 750 T140V is a motorcycle produced from 1973 to 1978. Its engine is a four-stroke, parallel twin, OHV design with 2 valves per cylinder and a capacity of 744cc. The bore and stroke are 76 x 82 mm and the compression ratio is 7.9:1. It has air-cooled induction with 2 x 30 mm Amal carburetors and battery/dual coil/dual points/Lucas ignition. The starting mechanism is kick-only. The maximum power output is 40.3 kW/54 hp @5000 rpm. The transmission is 5-speed with wet, multi-plate clutch and chain-type final drive. The frame is made of tubular steel with double front downtubes and oil-bearing large tube backbone. The front suspension is telescopic forks while the rear suspension features swingarm and Girling shocks with 3-way spring preload adjustable. The front and rear brakes are both single 254mm disc with 1 piston caliper. The front tyre size is 3.25-19 and the rear tyre size is 4.00-18. The rake of the bike is 28 degrees, while the trail is 109mm or 4.3 inches. The wheelbase is 1448mm/57 inches, and its dimensions are as follows: length: 2220mm/87.5 inches, width: 840mm/33.0 inches, seat height: 820mm/32.3 inches. The dry weight of the bike is 198kg/414lbs, and the fuel capacity is 12 litres/3.2 US gallons or 2.6 imperial gallons.

---

Technical specifications:

Make Model: Triumph Bonneville 750 T140V

Year: 1973 – 78

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: 7.9:1

Cooling System: Air cooled

Induction: 2 x 30 mm Amal carburetors

Ignition: Battery / dual coil / dual points / Lucas

Starting: Kick

Max Power: 40.3 kW / 54 hp @ 5000 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: 1448 mm / 57 in

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

Seat Height: 820 mm / 32.3 in

Dry Weight: 198 kg / 414 lbs

Fuel Capacity: 12 Litres / 3.2 US gal / 2.6 Imp gal