1964 TRIUMPH BONNEVILLE


1964 Triumph T120 Bonneville 650, Triumph motorcycles, Triumph TR6



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.

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.

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.

1964 Triumph T120 Bonneville 650, Triumph motorcycles, Triumph TR6

1964 Triumph Bonneville T120R, Roadster with down pipes.

1964 Triumph T120 Bonneville 650 gauges, Triumph motorcycles, Triumph TR6

1964 Triumph Bonneville T120R gauges. Both were switched in 1964 from Chronometrics to Smiths magnetic instruments.

1964 Triumph Bonneville, Triumph motorcycles, Triumph TR6

1964 Triumph Bonneville T120R unit construction engine.

1964 Triumph T120 Bonneville 650, Triumph motorcycles, Triumph TR6

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


1964 Triumph Bonneville SPECIFICATIONS:



MODEL DESIGNATIONS:
1964 Triumph Bonneville T120C.....................Scrambler
1964 Triumph Bonneville T120R.....................Roadster

ENGINE:
Engine type....................................... OHV vertical twin
Horsepower at RPM............................ 47 BHP @ 6,500 rpm
Bore................................................ 71mm / 2.79"
Stroke............................................. 82mm / 3.23"
Displacement.................................... 649cc / 40 cu. in.
Compression Ratio............................. 8.5:1
Valve Clearance (cold):
Inlet................................................ 0.05mm / 0.002"
Exhaust............................................ 0.10mm / 0.004"
Valve Timing:
Inlet Valve Opens.............................. 34 degrees BTDC
Inlet Valve Closes.............................. 55 degrees BTDC
Exhaust Valve Opens.......................... 55 degrees BTDC
Exhaust Valve Closes.......................... 27 degrees BTDC

IGNITION:
Ignition Breaker Gap............................. 0.4mm / 0.015"
Spark Plug Gap.................................. 0.50mm / 0.020"
Timing (static).................................14 degrees BTDC
Timing (fully advanced):........................ 38 degrees BTDC

CARBURETORS:
Type................................................ Amal Monobloc
Throat Size....................................... 1-1/8"
Main Jet........................................... 230
Needle Jet........................................ .106
Needle Position.................................. 2
Needle Type.......................................D
Throttle Valve.................................... 2
Pilot Jet............................................ 25

TRANSMISSION:
Speeds.............................................. 4
Gear Ratios:
4th - Top........................................... 5.84
3rd - Third......................................... 6.76
2nd - Second...................................... 8.17
1st - Bottom...................................... 11.8

CLUTCH:
Type................................................ Multi-plate, wet
Number of Plates:
Drive Plates...................................... 6
Driven Plates.................................... 6

SPROCKETS:
Engine............................................. 29 teeth
Clutch............................................. 58 teeth
Gearbox.......................................... 19 teeth
Rear Wheel...................................... 47 teeth

CHAIN:
Primary, pitch.................................. 3/8" triplex
Primary, length................................. 84 links
Final Drive, pitch............................... 5/8" X .400" X 3/8"
Final Drive, length............................. 106 links

CAPACITIES:
Fuel (US versions)............................. 2.5 Imp. gal.
Fuel (UK & export versions)................. 4 Imp. gal.
Oil Tank........................................... 5 pints / 3 L
Gearbox........................................... 1 pt / 500cc
Primary Chaincase............................. 1/4 pt / 150cc
Front Forks....................................... 6.4 oz. / 190cc

TIRES:
Front............................................... 3.25 X 19"
Rear................................................ 4.00 X 18"

SUSPENSION:
Front............................................... Telescopic Forks
Rear................................................ Swing Arm

BRAKES:
Front............................................... 8" / 20.32cm SLS
Rear................................................ 7" / 17.78cm SLS

DIMENSIONS:
Seat Height...................................... 32.5" / 77.5cm
Wheelbase........................................ 54.5" / 140.3cm
Length.............................................. 85.5" / 202cm
Width............................................... 28.5" / 72cm
Ground Clearance.............................. 5" / 12.7cm
Weight, unladen................................ 363 lbs / 165kg


TRIUMPH MOTORCYCLE BOOKS


TRIUMPH BONNEVILLE YEAR-BY-YEAR

TRIUMPH BONNEVILLE ESSENTIAL BUYER’S GUIDE

COMPLETE BOOK OF CLASSIC & MODERN TRIUMPHS

TRIUMPH MOTORCYCLES 1956-1983

FACTORY-ORIGINAL TRIUMPH TWINS

TRIUMPH MOTORCYCLES

TRIUMPH MOTORCYCLE RESTORATION, PRE-UNIT

TALES OF TRIUMPHS & THE MERIDEN FACTORY

TRIUMPH ILLUSTRATED SHOP MANUAL, 1935-1939

TRIUMPH ILLUSTRATED SHOP MANUAL, 1937-1951

TRIUMPH ILLUSTRATED SHOP MANUAL, 1945-1955


Triumph Motorcycles
Triumph Bonnevilles
Triumph Bonneville, Pre-Unit Construction, 1959-1962 Triumph Bonneville, Unit Construction, 1963-1970
Triumph Bonneville, Oil-in-Frame, 1971-1983

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