1965 TRIUMPH BONNEVILLE


1965 Triumph T120 Bonneville, Triumph motorcycles, Triumph TR6

1965 Triumph Bonneville T120R, Roadster w/down pipes.




SLOW STEADY REFINEMENT
The 1965 Triumph Bonneville T120 650 was again more or less a carry-over from 1964, which itself was a carry-over from 1963. Changes were minor and evolutionary in nature, aimed at refinement, improving reliability, performance and ease of production. Model designations were also carryovers: T120R was the road machine with down pipes; the T120C was the off-road/street scrambler (like an Enduro); and the TT Special, which wouldn't actually get its own official model designation until 1966. For now, the TT Special was an option package for the T120C series. The color scheme for 1965 was Pacific Blue over Silver.

ENGINE
Engine refinements began with Engine # DU13375 and included a drilled hole in the crankcase behind the cylinder to facilitate finding top dead center, a new oil pressure relief valve, and a change to Champion spark plugs. The exhaust system on the T120R was restyled (more swept back) and brackets added. UK and Export models retained the long mufflers, but US models got a shorter muffler with straight-through baffles. Minor changes were made to the kickstart mechanism, clutch lining material was switched to Armstrong cork, and a longer alternator cable was added to keep it from rubbing on the primary chain.

FRAME & RUNNING GEAR
Frame and running gear also received only minor attention. The rear subframe was modified slightly to make the center stand work better, the horn was hung from a new bracket under the tank, the rear brake actuator rod's operating arm was moved to the inside of the left engine mounting plate and the rod re-routed accordingly. The battery box received steel liners for its rubber mounts to prevent damage due to overtightening. The QD (Quickly Detachable) rear wheel swapped its taper roller bearings for ball race bearings.

PAINT & TRIM
Some US models got all-black seats, while most had the more familiar 2-tone gray-and-black seat, similar to 1964. The new paint colors continued to follow the same pattern as 1964, with the Pacific Blue top covering most of the tank, and the Silver showing only under the tank emblem. Of course the steel front and rear fenders were painted silver with a blue strip running down their center, except for the TT Specials, which sported lightweight polished alloy (aluminum) fenders.

1965 Triumph T120 Bonneville 650 tank, Triumph motorcycles, Triumph TR6

1965 Triumph Bonneville T120R unit construction engine & tank.

1965 Triumph T120 Bonneville 650, Triumph motorcycles, Triumph TR6

1965 Triumph Bonneville T120R, timing side.


1965 Triumph T120C Bonneville TT SPECIAL


1965 Triumph 650 TT Special, Triumph Bonneville, Triumph motorcycles, Triumph TR6

1965 Triumph Bonneville T120C TT Special.




TT SPECIAL BUILT FOR US MARKET
The Triumph Bonneville T120C TT Special was really the brainchild of US West Coast distributors, Johnson Motors, also known as "JoMo". The factory had taken way too long to introduce pure competition versions of their popular Bonneville line. Edward Turner was opposed to the idea, but burgeoning demand for such machines in the US was impossible to ignore.

SIMPLE: STRIP IT TO THE BONE, MAKE IT FAST!
Introduced in 1963, the TT Special was essentially a stripped-down Triumph Bonneville with high pipes & special tuning. They dominated American TT Scrambles & Desert Racing for years. Nothing could touch them.

COOL NEW TT PIPES
And no wonder. With wild cams, big carbs & a 11.2:1 compression ratio, the TT Special pumped out 52hp! For the 1965 TT Special, compression was dropped slightly to 11:1, still very high (which often lead to overheating problems). But, the big news for 1965 was the introduction of those gorgeous "TT Pipes", larger diameter downpipes that angled inward then met under the front of the engine, where they followed the centerline of the bike, under the engine. They were straight pipes & they shot their hot blast directly against the back tire. They were, and still are the coolest-looking pipes that ever graced a Triumph (in my humble opinion). This firmly established the "TT Special-look". And it provided the needed side clearance for sliding through corners in TT Scrambles events. The use of TT Pipes makes using a centerstand impossible.

Folding footpegs were a welcome addition. But strangely, the parcel rack on the top of the tank remained. New Roadster forks were fitted for much improved ride & handling.

JOMO LEADS THE WAY
East Coast distribution was handled by the Triumph factory & they always seemed to lag behind JoMo when it came innovation. Despite this, a batch of East Coast TT Specials (from Engine #DU18838 to DU18880) were fitted with cams that had been treated by a hardening process knows as Tuftriding. Some East Coast bikes came with alloy front fenders & ribbed steel rear fenders (painted), while most TTs came with polished alloy fenders front & rear.

Colors for the 1965 Triumph Bonneville T120C TT Special were Pacific Blue & Silver, the same as on the road models that year.

Triumph Bonneville, Triumph motorcycles, TT Special,


1965 Triumph Bonneville SPECIFICATIONS:



MODEL DESIGNATIONS:
1965 Triumph Bonneville T120C..................... Scrambler
1965 Triumph Bonneville T120C TT Special.......... Racer
1965 Triumph Bonneville T120R..................... Roadster

ENGINE:
Engine type....................................... OHV vertical twin
Horsepower at RPM............................ 47 BHP @ 6,700 rpm
Bore................................................ 71mm / 2.79"
Stroke............................................. 82mm / 3.23"
Displacement.................................... 649cc / 40 cu. in.
Compression Ratio............................. 8.5:1
Compression Ratio, TT Special................. 11.0:1
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 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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