The Triumph T120 Bonneville was a motorcycle produced in 1972-73 with a four-stroke, parallel-twin, OHV engine and a capacity of 649 cc. It had a compression ratio of 9.0:1, air-cooled cooling system, and 2 x 30 mm Amal concentric carburettors. The bike was built with battery coil ignition and a kick starting mechanism, and had a 12V alternator lighting system. The oil system used a double plunger pump with a dry sump, and had a capacity of 3.4L. The multi-disc, wet clutch produced a maximum power of 37.3 kW at 7000 rpm, with a maximum torque of 52.1 Nm at 6000 rpm.
The 4-speed transmission had a final drive chain, and gear ratios of 1st: 12.08, 2nd: 8.36, 3rd: 6.14, and 4th: 4.95. Suspension was provided by telescopic forks at the front and a swinging arm with dual shocks at the rear. The front and rear brakes were both drum brakes, and the bike weighed 181kg with a wet weight of 399lbs. It had a fuel capacity of 16L and was designed with a classic and iconic style.
Technical specifications:
Make Model: Triumph Bonneville 650 T120
| Year | 1972 – 73 |
|---|---|
| Engine | Four stroke, parallel twin, OHV |
| Capacity | 649 cc / 39.6 cu in |
| Bore x Stroke | 71 x 82 mm |
| Compression Ratio | 9.0:1 |
| Cooling System | Air cooled |
| Induction | 2 x 30 mm Amal concentric carburetors |
| Ignition | Battery, coil |
| Starting | Kick |
| Lighting system | 12V alternator |
| Oil system. | Double plunger pump, dry sump |
| Oil capacity | 3.4 L / 7.2 US pt / 6 Imp pt |
| Clutch | Multi-disc, wet |
| Max Power | 37.3 kW / 50 hp @ 7000 rpm |
| Max Toque | 52.1 Nm / 5.3 kgf-m / 38.5 lb-ft @ 6000 rpm |
| Transmission | 4 Speed |
| Final Drive | Chain |
| Gear Ratios | 4th 4.95 / 3rd 6.14 / 2nd 8.36 / 1st 12.08 |
| Front Suspension | Telescopic forks |
| Rear Suspension | Swinging arm, dual shocks |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| Front Tyre | 3.25 -19 |
| Rear Tyre | 4.00 -18 |
| Fuel Capacity | 16L / 4.2 US gal / 3.5 Imp gal |
| Wet Weight | 181 kg / 399 lbs |
