The 1964 Triumph Bonneville T-120R
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OVERALL
The 1964 Triumph Bonneville T120 650 was pretty much a carry-over from 1963.
And still at the same time a testament to the continuing process of refinement and development.
Model designations were as before, the T120R was the Roadster version, the T120C was the off-road/street scrambler (later called the Enduro).
The TT Special was a specially-tuned Bonneville stripped of all lights and street equipment, intended purely to race.
They became known for their distinctive "TT pipes", larger-diameter exhaust pipes running under the engine down the centerline of the bike, unbaffled.
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RUNNING GEAR
The only changes to the frame were the bolting of the footpegs to the rear engine mounting plates, and the strengthening of the center stand brackets.
The front forks however, were all new for 1964, with external springs covered in new rubber gators.
Upper fork covers with headlight brackets were finished in gloss black paint as were the lower sliders, except their upper section which was chromed.
Some UK and Export machines switched to Avon Speedmaster tires, while US machines continued to run Dunlops.
Both speedo (now 125 MPH) and tach were changed from Smiths Chronometric to Smiths Magnetic gauges.
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PAINT & TRIM
In the 'looks department', the seat remained the same, the new 1964 paint scheme was Gold on top and Alaskan White on the bottom.
However they were arranged in an entirely new way.
The new arrangement had the top color covering much more of the tank.
Leaving only a small area of the lower color (Alaskan White in this case) below the tank emblem.
The front fender was now steel, painted white with a gold stripe down the center.
The exception were the competition bikes, the TT Special which got polished alloy (aluminum) front fenders.
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1964 Triumph Bonneville T120R
This 1964 still had its original 6 volt electric system when I acquired it.
The electrical system was upgraded to 12 volts in Feb 2021.
A Pazon Electronic Ignition and Podtronics Regulator were included to add to the performance and dependabilty.
It also sports the UK import 4 Gallon Tank

SPECIFICATIONS:
Bonneville T120R Roadster, low pipes
Engine type Air-cooled OHV vertical twin
Displacement 649cc / 40.0 ci
Bore & Stroke 71mm X 82mm / 2.79" X 3.23"
Compression 8.5:1- Carburetors: 2- Amal Monobloc 1-1/16" w/ Velocity Stacks
12 Volt Ignition Battery & Coils
Engine output 46 bhp @ 6500
Primary drive 3/8" triplex chain X 84 links
Primary drive sprockets 29T X 58T
Clutch Multi-plate, wet
Gearbox 4-speed constant-mesh, right-foot shift
Ratios, overall:
1st 11.8:1, 2nd 8.17, 3rd 6.76, 4th, top 5.84
Chain 5/8" X .400" X 3/8" chain X 106 links
Final drive sprockets 19T X 47T
Frame type Brazed lug, full-cradle, single downtube
Suspension, front Telescopic fork, hydraulic damping
Suspension, rear Swing arm, 2 Girling dampers
Brake, front 8" SLS drum, full width
Brake, rear 7" SLS drum
Tire, front 3.25" X 19" Dunlop
Tire, rear 4.00" X 18" Dunlop
Fuel Capacity: 4 Imp gal. (UK & export) (2.5 Imp gal. US)
Wheelbase 54.5" / 140.3cm
Seat height 32.5" / 77.5cm
Ground clearance 5.0" / 12.7cm
Weight, unladen 363 lbs / 165 kg

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Ver. 02.23.21