Triumph T120R 650 Bonneville
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| Triumph T120R 650 Bonneville | |
| Manufacturer | |
|---|---|
| Production | 1965 |
| Engine | Four stroke, parallel twin, OHV |
| Compression ratio | 8.5:1 |
| Ignition | Lucas MA6 alternator with 2 coils |
| Transmission | 4 Speed, constant mesh |
| Frame | Single front downtube, second bracing member running under tank |
| Suspension | Front: Telescopic forks, hydraulic damping Rear: Swingarm, twin Girling dampers |
| Brakes | Front: 8" SLS drum Rear: 7" SLS drum |
| Front Tire | 3.25 x 19, Dunlop Universal |
| Rear Tire | 4.00 x 18, Dunlop Universal |
| Wheelbase | 1403 mm / 55.2 in |
| Seat Height | 775 mm / 30.5 in |
| Weight | 165 kg / 363 lbs (dry), |
| 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 |
| Manuals | Service Manual |
Engine[edit | edit source]
The engine was a Air cooled cooled Four stroke, parallel twin, OHV. The engine featured a 8.5:1 compression ratio.
Drive[edit | edit source]
Power was moderated via the Wet, multiplate.
Chassis[edit | edit source]
It came with a 3.25 x 19, Dunlop Universal front tire and a 4.00 x 18, Dunlop Universal rear tire. Stopping was achieved via 8" SLS drum in the front and a 7" SLS drum in the rear. The front suspension was a Telescopic forks, hydraulic damping while the rear was equipped with a Swingarm, twin Girling dampers. The T120R 650 Bonneville was fitted with a US: 13.6 L / 3.6 US gal / 3 Imp gal / UK and other Export: 18 L / 4.8 US gal / 4 Imp gal fuel tank. The bike weighed just 165 kg / 363 lbs. The wheelbase was 1403 mm / 55.2 in long.
Photos[edit | edit source]
Overview[edit | edit source]
Triumph T 120R 650 Bonneville
SLOW STEADY REFINEMENT
The 1965 Triumph Bonneville T120 650 was again more or less a carry-over
from 1964, which itself was a carry-over from 1963. Changes were minor and
evolutionary in nature, aimed at refinement, improving reliability,
performance and ease of production. Model designations were also carryovers:
T120R was the road machine with down pipes; the T120C was the
off-road/street scrambler (like an Enduro); and the TT Special, which
wouldn't actually get its own official model designation until 1966. For
now, the TT Special was an option package for the T120C series. The color
scheme for 1965 was Pacific Blue over Silver.
ENGINE Engine refinements began with Engine # DU13375 and included a drilled hole in the crankcase behind the cylinder to facilitate finding top dead center, a new oil pressure relief valve, and a change to Champion spark plugs. The exhaust system on the T120R was restyled (more swept back) and brackets added. UK and Export models retained the long mufflers, but US models got a shorter muffler with straight-through baffles. Minor changes were made to the kickstart mechanism, clutch lining material was switched to Armstrong cork, and a longer alternator cable was added to keep it from rubbing on the primary chain.
FRAME & RUNNING GEAR Frame and running gear also received only minor attention. The rear subframe was modified slightly to make the center stand work better, the horn was hung from a new bracket under the tank, the rear brake actuator rod's operating arm was moved to the inside of the left engine mounting plate and the rod re-routed accordingly. The battery box received steel liners for its rubber mounts to prevent damage due to overtightening. The QD (Quickly Detachable) rear wheel swapped its taper roller bearings for ball race bearings.
PAINT & TRIM Some US models got all-black seats, while most had the more familiar 2-tone gray-and-black seat, similar to 1964. The new paint colors continued to follow the same pattern as 1964, with the Pacific Blue top covering most of the tank, and the Silver showing only under the tank emblem. Of course the steel front and rear fenders were painted silver with a blue strip running down their center, except for the TT Specials, which sported lightweight polished alloy (aluminum) fenders.
Source
| Make Model | Triumph T120R Bonneville 650 |
|---|---|
| Year | 1965 |
| Engine Type | Four stroke, parallel twin, OHV |
| Displacement | 649 cc / 39.6 cu in |
| Bore X Stroke | 71 x 82 mm |
| Compression | 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 Tire | 3.25 x 19, Dunlop Universal |
| Rear Tire | 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 L / 3.6 US gal / 3 Imp gal / UK and other Export: 18 L / 4.8 US gal / 4 Imp gal |