1967 Triumph Bonneville
1967 Triumph Bonneville Background & History
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).
Changes to the 1967 Triumph Bonneville
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.
Internal changes were made to the transmission (gearbox) including a new 2nd-gear shift fork and 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 and American. Two sets of tools were necessary during these transitional years, Whitworth and American.
New Carbs for the 1967 Triumph Bonneville
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 and they had a choke for the first time on a Bonneville. Air filters were offered across the line, for the first time.
The contract breakers received a new auto-advance mechanism and the alternator stator was now encapsulated in resin. An interesting aside: Starting with Engine #DU59230, Triumph stopped using Lucas bulbs and started buying their bulbs from Mazda.
1967 Triumph Bonneville Running Gear
Changes to the frame were minimal. A steering head lock was added and many of the fasters were changed over from British threads to Unified (aka American) threads. UK and 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.
1967 Triumph Bonneville Paint Colors & Trim
The seat changed for the first time in years, getting narrower in front to match the new slimline tank and 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 and Export models got 2-tone gray and 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) and Alaskan White, broken up in a new pattern on the tank. US bikes had two options: Aubergine and 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 Specifications
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Bonneville T120R Bonneville T120C Bonneville TT Special 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 Competition, TT pipes Air-cooled OHV vertical twin 649cc / 40.0 ci 71mm X 82mm / 2.79″ X 3.23″ 9.0:1 (T120) / 11.0:1 (TT Special) 2- Amal Monobloc 1-1/16″ / 1-3/16″ (TT) Battery & coil (T120) / Energy Transfer (TT) 47 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 |
Triumph Bonneville Books
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By Brooklands Books, 172 pages Reprints of motorcycle magazine road tests, racing, new model releases, tech data, specs & more. |
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More Triumph Bonneville Pages
1959 T120 Bonneville
1960 T120 Bonneville
1961 T120 Bonneville
1962 T120 Bonneville
1963 T120 Bonneville
1964 T120 Bonneville
1965 T120 Bonneville
1966 T120 Bonneville
1967 T120 Bonneville
1968 T120 Bonneville
1969 T120 Bonneville
1970 T120 Bonneville
1971 T120 Bonneville
1972 T120 Bonneville
1973 T140 Bonneville
1974 T140 Bonneville
1975 T140 Bonneville
1976 T140 Bonneville
1977 T140 Bonneville
1977 T140J Silver Jubilee
1978 T140 Bonneville
1979 T140 Bonneville
1980 T140 Bonneville
1981 T140 Bonneville
1982 T140 Bonneville
1983 T140 Bonneville
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