Triumph T120 Bonneville (1969)

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The Triumph T120R Bonneville 650 was a four-stroke, parallel twin, OHV motorcycle with a capacity of 649 cc/39.6 cu in, produced in 1969. It had a compression ratio of 8.5:1 and was air-cooled, with 2x Amal 1-1/6″ carburetors and Lucas MA6 alternator with 2 coils ignition. The motorcycle had a kick start and could produce a maximum power of 34 kW/46 hp at 6500 rpm. Its wet, multiplate clutch was coupled with a 4-speed, constant mesh transmission and it had a chain, 106 links final drive. The frame was a single front downtube with a second bracing member running under the tank, while the steering angle was 65o. The front suspension used telescopic forks with hydraulic damping, while the rear suspension used a swingarm with twin Girling dampers. It had an 8″ SLS drum front brake and a 7″ SLS drum rear brake, with a 3.25 x 19 Dunlop Universal front tyre and a 4.00 x 18 Dunlop Universal rear tyre. The dimensions of the motorcycle were length 2020 mm/85.5 in, width 720 mm/28.5 in, wheelbase 1403 mm/55.2 in, seat height 775 mm/30.5 in, ground clearance 127 mm/5.0 in, and dry weight 165 kg/363 lbs. The US version had a fuel capacity of 13.6 liters/3.6 US gal while the export version had a fuel capacity of 18 liters/4.8 US gal.

Technical specifications:

Make Model: Triumph T120R Bonneville 650

Year: 1969


Engine: Four stroke, parallel twin, OHV
Capacity: 649 cc / 39.6 cu in
Bore x Stroke: 71 x 82 mm
Compression Ratio: 8.5:1
Cooling System: Air cooled
Induction: 2 x Amal 1 – 1/6″ carburetors
Ignition: Lucas MA6 alternator with 2 coils
Starting: Kick
Max Power: 34 kW / 46 hp @ 6500 rpm
Clutch: Wet, multiplate
Transmission: 4 Speed, constant mesh
Final Drive: Chain, 106 links
Gear Ratios: 1st 11.80 / 2nd 8.17 / 3rd 6.76 / 4th 5.84:1
Frame: Single front downtube, second bracing member running under tank
Steering Angle: 65o

Front Suspension: Telescopic forks, hydraulic damping
Rear Suspension: Swingarm, twin Girling dampers
Front Brakes: 8″ SLS drum
Rear Brakes: 7″ SLS drum
Front Tyre: 3.25 x 19, Dunlop Universal
Rear Tyre: 4.00 x 18, Dunlop Universal
Dimensions: Length 2020 mm / 85.5 in Width 720 mm / 28.5 in
Wheelbase: 1403 mm / 55.2 in
Seat Height: 775 mm / 30.5 in
Ground Clearance: 127 mm / 5.0 in
Dry Weight: 165 kg / 363 lbs
Fuel Capacity: US: 13.6 Litres / 3.6 US gal other Export: 18 Litres / 4.8 US gal

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