1967 TRIUMPH BONNEVILLE


1967 Triumph Bonneville, Triumph motorcycles, Triumph TR6, Triumph TT



MODEL LINE-UP
The 1967 Triumph Bonneville T120 650 continued to be developed and refined in incremental steps, sometimes one forward and two back. Model designations carried over from late-1966, that is, the TT Special now had it's own stand-alone model designation, the T120TT. This went along with the traditional T120R Road version, and the T120C off-road/street scrambler (what might have been called an enduro had it been introduced a few years later).

ENGINE
Starting with Engine # DU44394, new Hepolite pistons were fitted, then starting with Engine #DU47006, stronger connecting rods were installed to deal with the added stress. A hotter exhaust cam (E3134), and in the interest of better oiling for its lobes, things were done, then undone, then redone before settling on a timed oil feed to the tappet block. Chromed steel braces were added between the exhaust pipes and the front of the engine. UK bikes began fitting the smaller US-market mufflers.

GEARBOX
Internal changes were made to the transmission (gearbox) including a new 2nd-gear shift fork & a near-total conversion over from British Standard threads to Unified (American) threads. This process would continue over the next few model years, during which time there was an odd mix of the two thread types, British & American. Two sets of tools were necessary during these transitional years, Whitworth & American.

NEW AMAL CONCENTRICS
The big news for the 1967 Triumph Bonneville was the switch from Amal Monobloc carburetors to Amal Concentrics, starting with Engine #DU59320, now measured in mm instead of inches. They were 30mm & they had a choke for the first time on a Bonneville. Air filters were offered across the line, for the first time.

RUNNING GEAR
The contract breakers received a new auto-advance mechanism & the alternator stator was now encapsulated in resin. An interesting aside: Starting with Engine #DU59230, Triumph stopped using Lucas bulbs & started buying their bulbs from Mazda.

Changes to the frame were minimal. A steering head lock was added & many of the fasters were changed over from British threads to Unified (aka American) threads. UK & Export models swapped their 18" front wheels for 3.25 X 19" rolling stock with Dunlop ribbed tires. US bikes kept 18" wheels on both ends, but the 4.00 X 18" rear tire option was gaining in popularity among America's desert racers.

PAINT & TRIM
The seat changed for the first time in years, getting narrower in front to match the new slimline tank & gaining a 'step' for the passenger, and was upholstered with lateral 'tuck-and-roll' ribs upholstery for the first time. Most US machines sported all-black seats, while most UK & Export models got 2-tone gray & black seats. All had the Triumph logo emblazoned on the back.

Colors for 1967 varied more than ever before. UK and Export machines were Aubergine (a deep red) & Alaskan White, broken up in a new pattern on the tank. US bikes had two options: Aubergine & Alaskan White, just like the UK; or Aubergine & Gold. The US bikes were also painted in a different pattern than ever before, the lower color on the tank (either the Gold or the White) taking on a 'flying wing/windswept-shape', for lack of a better way of putting it. Oh and the Smiths magnetic speedometer now went to 150 MPH!

1967 Triumph Bonneville, Triumph motorcycles, Triumph TR6, Triumph TT

1967 Triumph Bonneville T120R Roadster with down pipes.

1967 Triumph Bonneville engine, Triumph motorcycles, Triumph TR6, Triumph TT

1967 Triumph Bonneville 650 unit construction engine.

1967 Triumph Bonneville, Triumph motorcycles, Triumph TR6, Triumph TT

1967 Triumph Bonneville T120R front-right, timing side.

1967 Triumph Bonneville, Triumph motorcycles, Triumph TR6

The 1967 Triumph Bonneville came in 2 basic color schemes: Aubergine (dark red) & Gold; and Aubergine & Alaskan White. This example has the Aubergine & Gold paint job.


1967 Triumph Bonneville TT Special


1967 Triumph Bonneville TT Special, Triumph motorcycles, Triumph TR6

1967 Triumph Bonneville T120TT, last year for the TT Special.


1967 Triumph Bonneville SPECIFICATIONS:



MODEL DESIGNATIONS:
1967 Triumph Bonneville T120C..................... Scrambler
1967 Triumph Bonneville T120R..................... Roadster
1967 Triumph Bonneville T120TT.................... TT Special

ENGINE:
Engine type....................................... OHV vertical twin
Horsepower at RPM............................ 49 BHP @ 6,200 rpm
Bore................................................ 71mm / 2.79"
Stroke............................................. 82mm / 3.23"
Displacement.................................... 649cc / 40 cu. in.
Compression Ratio............................. 9.0:1
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 Concentric
Throat Size....................................... 30mm
Main Jet........................................... 210
Needle Jet........................................ .107
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 Bonneville
Triumph Bonneville, Pre-Unit Construction, 1959-1962
Triumph Bonneville, Unit Construction, 1963-1970
Triumph Bonneville, Oil-in-Frame, 1971-1983

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