Triumph Bonneville 650 T120V


Make Model

Triumph Bonneville 650 T120V




Four stroke, parallel twin, OHV


649 cc / 39.6 cu in
Bore x Stroke 71 x 82 mm
Compression Ratio 9.0:1
Cooling System Air cooled


2 x 30 mm Amal concentric carburetors


Battery, coil 


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


4 Speed

Final Drive

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


Rear Brakes


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

T120 Export models:
T120R – Export model intended for the US market with in varying years, varying differences.

T120V - 5-speed model available 1972.

T120C – Competition model with high-level exhaust pipes.

T120TT – 1964 model of the T120C for the US East Coast. In 1968 Evel Knievel jumped the Caesar's Palace Casino fountains on a Bonneville T120TT, and was seriously injured breaking many bones after losing control on landing

T120RT – A special 750 cc model which had Routt 750cc cylinder kits installed in America by Triumph to permit them to be used in American Motorcycle Association production-based racing events. The kits were installed on new T120R models while still crated. To qualify, motorcycles had to be made and sold to the public in the same form as they would be raced. Triumph had to produce and sell at least 200 of them before they qualified, and although the exact number sold is not recorded they did meet the requirement. The T was stamped separately on the engine cases in America after the stock T120R when the modifications were made, the frames were not stamped.

T120RV - The 5-speed is generally considered to have been available—and was advertised as such—starting in 1972 with the T120V. However, a small pre-production run of 5-speeds were made in June 1971 only, and sold as '71 models. They were externally identical to their '71 T120R 4-speed counterparts, and did not carry any "V" decals such as the 1972 5-speeds displayed on their side panels. They were factory (not dealer) modified T120R models, so their engines/frames/and titles are designated T120RV,with the V being stamped separately when the transmissions were installed. These early factory Triumph 5-speeds are not be confused with the Quaife 5-speeds that were listed as stocked for sale by Triumph dealers in 1970 to qualify for AMA purposes (the parts "had to be available from Triumph"). The first and final T120RV ratios in 1971 were the same as the 4-speed model, making it a matter of closer ratios, unlike later 5-speeds. These 5-Speeds were not advertised, were not available as an option, and could not be ordered—as the few manufactured were simply distributed individually to selected Triumph dealers and sold by word of mouth.