Triumph T120 Bonneville Police (1966)

The Triumph T120 Bonneville 650 Police is a motorcycle from 1966 with a four-stroke, parallel twin, OHV engine and a capacity of 649 cc or 39.6 cu in. It has a compression ratio of 8.5:1 and is air-cooled with induction through two Amal 1 -1/6″ carburetors. The Lucas MA6 alternator with 2 coils provides the ignition system, and it has a kick starter. The motorcycle can produce 34 kW or 46 hp of power at 6500 rpm and has a wet, multiplate clutch with a 4-speed constant mesh transmission and a chain-driven 106-link final drive. The frame is a single front downtube with a second bracing member running under the tank and a 65° steering angle. The front suspension is telescopic forks with hydraulic damping, and the rear suspension is a swingarm with twin Girling dampers. The front and rear brakes are 8″ SLS drum and 7″ SLS drum, respectively. The motorcycle has a length of 2020 mm or 85.5 in, a width of 720 mm or 28.5 in, a wheelbase of 1403 mm or 55.2 in, and a seat height of 775 mm or 30.5 in. The fuel capacity is 13.6 L or 3.6 US gal / 3 Imp gal for the US and 18 L or 4.8 US gal / 4 Imp gal for the UK and other export markets.

Technical specifications:

Make Model: Triumph T120 Bonneville 650 Police

Year: 1966
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
Fuel Capacity: US: 13.6 L / 3.6 US gal / 3 Imp gal / UK and other Export: 18 L / 4.8 US gal / 4 Imp gal