1962 Triumph Bonneville

1962 TRIUMPH BONNEVILLE -MODEL DESIGNATIONS
The 1962 Triumph Bonneville again came in two basic model designations: T120R was the Road version, and T120C was the Street Scrambler/Off-Road version (what later might have been called an Enduro). Most of the bike was strictly carry-over from 1961. Of course, this was the last year for the non-unit construction engine and the duplex frame, the same applied to its sister-bike, the Triumph TR6. So, Triumph Motorcycles did little development work to this 'lame duck' model. All the money, time and engineering was being poured into the new-for-1963 Unit-Construction 650.

TRYING TO ACHIEVE BALANCE
For the 1962 Triumph Bonneville, most of the development work was aimed at quelling vibration, which with the added power of the twin-carb Bonnie, was beginning to be a real problem. Starting with Engine #K15789, the crankshaft balance factor was juggled again, from 50% back up to 71% (it had been dropped from 70% to 50% in 1959 in an effort to curb vibration). Then, starting with Engine #D17043, the balance factor was changed again to 85%, and an entirely new crankshaft was introduced, with 'pear-shaped' webs. The new crank was heavier, and while it may have helped reduce vibration slightly, it was at the cost of acceleration.

ABOVE: 1962 Triumph Bonneville engine & gearbox from the timing side. Notice the open carbs (no filters) & the woven spark plug wires leading to either side of the magneto.

FUEL SYSTEM
While the carburetors remained the same, a new petcock arrangement allowed both carbs to be fed by either petcock. As it turned out, to capture the full performance of the 1962 Triumph Bonneville 650 engine, both petcocks still needed to be open to supply enough fuel to both carbs on full boil. The only other change to the powerplant was a slightly higher 3rd gear ratio.

THE SAME, BUT DIFFERENT
Again, as always, the 1962 Triumph Bonneville was the twin-carb version of the Triumph TR6, albeit with different paint colors.

ELECTRICS
The American-market T120Cs got a more waterproof "Wader' version of the Lucas K2FC auto-advance magneto. A new Lucas RM19 alternator also made its debut, while retaining the previous lower-output stator to minimize bulb failure and battery overcharging. The horn was also changed to a Type H8.
ABOVE: Gauge cluster (clocks) on a 1962 Triumph Bonneville T120.

NEW COLORS
The biggest differences between the 1962 Triumph Bonneville and the 1961 it replaced (aside from the vibration-abatement measures), was the appearance of the motorcycle. The seat was now 2-tone, with a gray panel on the top surface and along the bottom edge, with black on the sides and back. And the color was a big switch from the pale blues of the past couple of years. For 1962, all Triumph Bonnevilles were painted Flame and Sliver Sheen. Flame, which is very orange, was on the top and Silver on the bottom, separated as before by a gold pinstripe.

LAST OF THE PRE-UNITS
The 1962 Triumph Bonneville marked the end of an age. It was the last non-unit construction motorcycle built by Triumph. Unit construction ushered in the modern age, or so it must have seemed at the time. Little did they know that just a few short years from then, the Japanese would flood the market with technologically advanced machinery the likes of which the world had never seen!


1962 Triumph T120 Bonneville SPECIFICATONS

Bonneville T120/R

Bonneville T120/C

Engine type

Displacement

Bore & Stroke

Compression

Carburetor

Ignition

Engine output

Primary drive

Primary 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

Fuel capacity

Dry weight

Roadster (low pipes)

Scrambler (high pipes)

Air-cooled OHV vertical twin, non-unit

649cc / 40.0 ci

71mm X 82mm / 2.79" X 3.23"

8.5:1

2- Amal Monobloc 1-1/6"

Lucas magneto

46 bhp @ 6500 rpm

1/2" X .335" X 5/16" chain, 70 links

22T X 43T

Multi-plate, wet

4-speed constant mesh, right foot shift


11.9:1

8.25:1

5.81:1

4.88:1

5/8" X .400" X 3/8" chain, 101 links

18T X 43T

Brazed lug, rigid

Telescopic fork, hydraulic damping

Swing arm, 2 Girling dampers

8" SLS drum

7" SLS drum

3.25" X 18" Dunlop

4.00" X 18" Dunlop

3 Imp gal (US); 4 Imp gal (UK & export)

54.5" / 140 cm

30.5" / 77 cm

5" / 12.7 cm

3 Imp gal (US); 4 Imp gal (UK & export)

393 lbs / 178 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


Check out these TRIUMPH BOOKS

COMPLETE BOOK OF CLASSIC & MODERN TRIUMPHS


TRIUMPH MOTORCYCLES IN AMERICA


TRIUMPH MOTORCYCLE RESTORATION


TRIUMPH MOTORCYCLE RESTORATION, PRE-UNIT


TRIUMPH BONNEVILLE & TR6 RESTORATION GUIDE: 1956-1983


TALES OF TRIUMPH MOTORCYCLES & THE MERIDEN FACTORY


TRIUMPH 650 & 750 TWINS OWNERS WORKSHOP MANUAL, 1963-1983


TRIUMPH BONNEVILLE: ESSENTIAL BUYER’S GUIDE


TRIUMPH BONNEVILLE: PORTRAIT OF A LEGEND


ILLUSTRATED TRIUMPH BUYER’S GUIDE, by Roy Bacon


TRIUMPH BONNEVILLE, 2001-2015


TRIUMPH: PRODUCTION TESTERS TALES FROM MERIDEN


TRIUMPH MOTORCYCLE RESTORATION GUIDE


TRIUMPH OWNERS HANDBOOK, UNIT-CONSTRUCTION 350 & 500, Kindle


TRIUMPH ILLUSTRATED WORKSHOP MANUAL 1945-1955, by Clymer


TRIUMPH TWINS & TRIPLES


FACTORY-ORIGINAL TRIUMPH TWINS, 1938-1962


TRIUMPH BONNEVILLE & TR6, by Timothy Remus


TRIUMPH MOTORCYCLES: FROM SPEED TWIN TO BONNEVILLE


TRIUMPH MOTORCYCLES: THEIR RENAISSANCE & THE HINKLEY FACTORY


TRIUMPH PRE-UNIT TWINS OWNERS WORKSHOP MANUAL


TRIUMPH THRUXTON BONNEVILLE 1959-1969


TRIUMPH MOTORCYCLES ILLUSTRATED WORKSHOP MANUAL 1937-1951, by Clymer


TURNER’S TRIUMPHS: EDWARD TURNER & HIS TRIUMPHS


TRIUMPH TWIN RESTORATION, by Roy Bacon


TRIUMPH TIGER CUB & TERRIER 1952-1968, Haynes Repair Manual


TRIUMPH 675 DAYTONA & SPEED TRIPLE REPAIR MANUAL 2006-2010, Haynes


CLASSIC MOTORCYCLES: TRIUMPH


TRIUMPH BONNEVILLE YEAR BY YEAR


TRIUMPH TRIPLES


TRIUMPH RACING MOTORCYCLES IN AMERICA


TRIUMPH MOTORCYCLES


TRIUMPH, by Roy Bacon


TRIUMPH 750/900 TRIPLES & 1200 FOURS 1991-1999, Haynes Repair Manual


TRIUMPH TROPHY BIBLE


TRIUMPH DAYTONA, SPEED TRIPLE SPRINT & TIGER: 885/955 1997-2005, Haynes Repair Manual


BSA & TRIUMPH TRIPLES GOLD PORTFOLIO 1968-1976


TRIUMPH TRIDENT OWNERS WORKSHOP MANUAL, by Haynes


TRIUMPH: A CENTURY OF PASSION & POWER


TRIUMPH BONNEVILLE, by Osprey


TRIUMPH TIGER 100 & 110, 1939-1961, by Roy Bacon


TRIUMPH TIGER 100 & DAYTONA


TRIUMPH BONNEVILLE, by Crowood


TRIUMPH by Don Morley


TRIUMPH TRIPLES & FOURS 1991 & 2004


TRIUMPH 350 & 500 1957-1974 ESSENTIAL BUYERS GUIDE


BONNIE: THE DEVELOPMENT OF THE TRIUMPH BONNEVILLE


TRIUMPH SINGLES: EARLY DAYS TO 1974, by Roy Bacon


TRIUMPH: RETURN OF THE LEGEND


TRIUMPH FUEL INJECTED TRIPLES 1997-2000


BOOK OF TRIUMPH TWINS 1968-1969, by Floyd Clymer


THE TRIUMPH STORY: RACING & PRODUCTION MODELS 1902-PRESENT


TRIUMPH 350 & 500 TWINS 1958-1973, Haynes Repair Manual


TRIUMPH BONNEVILLE 2001-=2008 ROAD TEST PORTFOLIO


HINKLEY TRIPLES & FOURS


TRIUMPH PRE-UNIT TWINS


HINKLEY TRIUMPHS: THE FIRST GENERATION


TRIUMPH BONNEVILLE BIBLE: ALL MODELS 1959-1983


TRIUMPH TWENTY-ONE TO DAYTONA: C CLASS 350 & 500 TWINS


ORIGINAL TRIUMPH BONNEVILLE


TRIUMPH 650 & 750 TWINS


TRIUMPH MOTORCYCLES & CUSTOM BIKES


TRIUMPH MOTORCYCLES


TRIUMPH, THE LEGENDS SERIES


TRIUMPH THUNDERBIRD SUPER PROFILE


TRIUMPH SPEED TWIN & THUNDERBIRD BIBLE


TRIUMPH BONNEVILLE T120/T140


TRIUMPH MOTORCYCLES FROM 1950-1983


TRIUMPH & BSA TRIPLES: THE COMPLETE STORY


TRIUMPH THUNDERBIRD, TROPHY & TIGER ESSENTIAL BUYERS GUIDE


TRIUMPH TIGER CUB BIBLE


ROAD RACING HISTORY OF THE TRIUMPH 500 UNIT TWIN


EDWARD TURNER: THE MAN BEHIND THE MOTORCYCLES


SAVE THE BONNEVILLE: THE INSIDE STORY OF THE MERIDEN WORKERS CO-OP


TRIUMPH DAYTONA 1991-2006 ROAD TEST PORTFOLIO


TRIUMPH DAYTONA 2003-2009 ROAD TEST PORTFOLIO


TRIUMPH TIGER 100 / DAYTONA: DEVELOPMENT HISTORY


TRIUMPH, by Daniel Gilpin


BOOK OF TRIUMPH MOTORCYCLES ILLUSTRATED SHOP MANUAL 1935-1939


TRIUMPH: THE RACING STORY


TRIUMPH BONNEVILLE T120 1959-1974, by Roy Bacon


TRIUMPH BONNEVILLE GOLD PORTFOLIO 1959-1983


TRIUMPH TRIDENT SUPER PROFILE


ILLUSTRATED TRIUMPH BUYERS GUIDE, by Roy Bacon






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