1964 Triumph Bonneville

SECOND YEAR CARRYOVER
The 1964 Triumph Bonneville T120 650 was pretty much a carry-over from 1963 and at the same time a testament to the continuing process of refinement and development. Model designations were as before, with one important addition: the TT Special. Again, the T120R was the Road version, the T120C was the off-road/street scrambler (what would later be referred to as an Enduro), and 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.
ABOVE: 1964 Triumph Bonneville T120R, Roadster with down pipes.

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 tack were changed from Smiths Chronometric to Smiths Magnetic gauges.
ABOVE: 1964 Triumph Bonneville T120R gauges. Both were switched in 1964 from Chronometrics to Smiths magnetic instruments.

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. Instead of simply dividing the colors horizontally and separating them at the back with a pinstripe, the new arrangement had the top color covering much more of the tank, following the line of the kneepads, 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.

BELOW: 1964 Triumph Bonneville T120R unit construction engine.

BELOW: 1964 Triumph Bonneville T120R. 2-tone seat had smooth top.

1964 Triumph Bonneville
SPECIFICATIONS


Bonneville T120R

Bonneville T120C

Engine type

Displacement

Bore & Stroke

Compression

Carburetors

Ignition

Engine output

Primary drive

Primary drive sprockets

Clutch

Gearbox

Ratios, overall:

1st, bottom

2nd

3rd

4th, top

Final drive

Final drive sprockets

Frame type

Suspension, front

Suspension, rear

Brake, front

Brake, rear

Tire, front

Tire, rear

Fuel Capacity

Wheelbase

Seat height

Ground clearance

Weight, unladen

Roadster, low pipes

Street Scrambler, high pipes

Air-cooled OHV vertical twin

649cc / 40.0 ci

71mm X 82mm / 2.79" X 3.23"

8.5:1 (T120) / 11.2:1 (TT Special)

2- Amal Monobloc 1-1/16" / 1-3/16" (TT)

Battery & coil (T120) / Energy Transfer (TT)

46 bhp @ 6500 (T120) / 52 bhp (TT)

3/8" triplex chain X 84 links

29T X 58T

Multi-plate, wet

4-speed constant-mesh, right-foot shift


11.8:1

8.17

6.76

5.84

5/8" X .400" X 3/8" chain X 106 links

19T X 47T

Brazed lug, full-cradle, single downtube

Telescopic fork, hydraulic damping

Swing arm, 2 Girling dampers

8" SLS drum, full width

7" SLS drum

3.25" X 19" Dunlop 

4.00" X 18" Dunlop

2.5 Imp gal (US) / 4 Imp gal (UK & export)

54.5" / 140.3cm

32.5" / 77.5cm

5.0" / 12.7cm

363 lbs / 165 kg


MORE TRIUMPH BONNEVILLES:
Triumph Bonneville
Triumph Bonneville Pre-Unit (1959-1962)
.....1959
.....1960
.....1961
.....1962
Triumph Bonneville, Unit-Construction(1963-1970)
.....1963
.....1964
.....1965
.....1966
.....1967
.....1968
.....1969
.....1970
Triumph Bonneville, Oil-in-Frame
.....1971
.....1972
.....1973
.....1974
.....1975
.....1976
.....1977
.....1978
.....1979
.....1980
.....1981
.....1982
.....1983
Les Harris Bonnevilles(1983-1989)
OTHER TRIUMPHS:
Triumph TR6
Triumph TR7
Triumph Trophy
Triumph Tiger
Triumph Thunderbird
Triumph Trident
Triumph X-75 Hurricane


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TALES OF TRIUMPH MOTORCYCLES & THE MERIDEN FACTORY


COMPLETE BOOK OF CLASSIC & MODERN TRIUMPHS


TRIUMPH BONNEVILLE & TR6


TRIUMPH MOTORCYCLES, THEIR RENAISSANCE & THE HINKLEY FACTORY


BONNIE: THE DEVELOPMENT OF THE TRIUMPH BONNEVILLE


TRIUMPH SPEED TWIN & THUNDERBIRD BIBLE


HINKLEY TRIUMPH TRIPLES & FOURS ESSENTIAL BUYERS GUIDE


TRIUMPH PRODUCTION TESTERS’ TALES FROM THE MERIDEN FACTORY


TURNER’S TRIUMPHS: EDWARD TURNER & HIS TRIUMPH MOTORCYCLES


TRIUMPH TROPHY BIBLE


HINKLEY TRIUMPHS, THE FIRST GENERATION


BONNIE: THE DEVELOPMENT OF THE TRIUMPH BONNEVILLE


TRIUMPH: A CENTURY OF PASSION & POWER


TRIUMPH TWIN RESTORATION


CONENTRY’S BICYCLE HERITAGE


HOW TO RESTORE YOUR BSA ROCKET III/TRIUMPH TRIDENT


TRIUMPH & BSA TRIPLES: THE COMPLETE STORY OF THE TRIDENT & ROCKET 3


TIGER CUB BIBLE


TRIUMPH SINGLES: EARLY DAYS TO 1974 BY ROY BACON


BRITISH MOTORCYCLES: TRIUMPH


TRIUMPH MOTORCYCLE RESTORATION, PRE-UNIT


TRIUMPH PRE-UNIT TR5, 5T, 6T, T100 & T110 FACTORY SHOP MANUAL


TRIUMPH MOTORCYCLE RESTORATION


ILLUSTRATED TRIUMPH MOTORCYCLE BUYER’S GUIDE BY ROY BACON


FACTORY ORIGINAL TRIUMPH TWINS 1938-1962


TRIUMPH BONNEVILLE: PORTRAIT OF A LEGEND


TRIUMPH 650 & 750 TWIN REPAIR MANUAL 1963-1983, BY HAYNES


TRIUMPH MOTORCYCLES IN AMERICA


TRIUMPH BONNEVILLE 2001-2012 REPAIR MANUAL BY HAYNES


TRIUMPH BONNEVILLE: THE ESSENTIAL BUYERS GUIDE


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TRUIMPH MOTORCYCLES: FROM SPEED TWIN TO BONNEVILLE


BOOK OF TRIUMPH TWINS BY CLYMER


TRIUMPH BONNEVILLE BIBLE, ALL MODELS 1959-1983


TRIUMPH TIGER CUB & TERRIER 1952-1968 REPAIR MANUAL BY HAYNES


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TRIUMPH MOTORCYCLES ILLUSTRATED WORKSHOP MANUAL 1945-1955 BY CLYMER


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TRIUMPH 350 & 500 UNIT TWINS ESSENTIAL BUYERS GUIDE


TRIUMPH TWIN RESTORATION BY ROY BACON


TRIUMPH BONNEVILLE & TR6 MOTORCYCLE RESTORATION GUIDE


TRIUMPH: RETURN OF THE LEGEND


BSA & TRIUMPH TRIPLES: GOLD PORTFOLIO


TRIUMPH MOTORCYCLE RESTORATION GUIDE: BONNEVILLE & TR6


TRIUMPH THUNDERBIRD 6T ROAD TEST 1966


TRIUMPH 500-750 TWINS 1963-1979, SERVICE, REPAIR & PERFORMANCE MANUAL


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TRIUMPH TIGER 800 SERVICE MANUAL 2010-2014, HAYNES


TRIUMPH TT600 MOTORCYCLE SERVICE MANUAL


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TRIUMPH, BY ROY BACON


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TRIUMPH 500 UNIT TWINS 1958-1973 REPAIR MANUAL, BY HAYNES


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TRIUMPH OWNERS MANUAL: UNIT CONSTRUCTION 350 & 500 TWINS

TRIUMPH INSTRUCTION MANUAL: TRW 499cc SV TWIN


TRIUMPH SPEED TWIN INSTRUCTION BOOK FOR 1939


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CHILTON’S TRIUMPH MOTORCYCLE REPAIR & TUN-UP GUIDE


2010-14 TRIUMPH TIGER 800 HAYNES SERVICE MANUAL


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TRIUMPH MOTORCYCLE RESTORATION, BY TIM REMUS


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TRIUMPH FUEL INJECTED TRIPLES 1997-2000


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TRIUMPH MOTORCYCLE OWNERS HANDBOOK, ALL MODELS 1937-1951


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CHILTON’S REPAIR & TUNE-UP GUIDE, TRIUMPH THROUGH 1972


OVERHAUL MANUAL FOR TRIUMPH 3-CYLINDER ENGINE


TRIUMPH BONNEVILLE T120, 1959-1974, BY ROY BACON


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TRIUMPH PRE-UNIT TWINS WORKSHOP MANUAL


TRIUMPH 350/500 TWINS WORKSHOP MANUAL






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