1974 Triumph Bonneville

ABOVE: Since so few 1974s are in existence, we had to make due with this lovely 1973 Triumph Bonneville. Other than color (Astral Red was actually a Canadian color combo), this '73 looks just like a '74.

SHORT MODEL YEAR
The 1974 Triumph Bonneville was built in very low numbers. It was a very odd year in Triumph Bonneville history. Angry workers hearing of the impending shutdown of the Triumph Motorcycles plant at Meriden, shut it down themselves in protest, in October 1973 just as production was being switched from 1973 models to making 1974s. This affected not just Triumph Bonneville production but also Triumph TR6, TR7, & Triumph Daytona (Tridents were produced at BSA's Small Heath plant, side-by-side with BSA Rocket 3s). Production didn't resume again until 1975, so very few 1974 Triumph Bonneville s were ever produced.

FEW CHANGES
However, the 1974 Triumph Bonneville model year did begin officially with Engine #GJ55101, but since so few bikes were actually built, the usual rash of mid-year revisions never happened. As the result, one of the very few changes made to the engine were new rocker boxes with two extra bolts on each inspection cover. The slimline tank grew from 2-1/2 US gals to 3.6 US gals. Other than minor detail changes here & there, the only other significant difference from the previous model year was the color schemes, now Cherokee Red over Cold White with Gold pinstriping for the T140, and Purple over Cold White on T120s. Again, the fenders were chromed & only the tank was painted.


1974 Triumph Bonneville SPECIFICATIONS


T140RV Bonneville

Engine type

Displacement

Bore & Stroke

Compression

Carburetors

Ignition

Engine output

Primary drive

Primary sprockets

Clutch

Gearbox

Ratios, overall:

1st, bottom

2nd

3rd

4th

5th, 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

5-speed 750 Roadster

Air-cooled OHV vertical twin

744cc / 45.0 ci

76mm X 82mm / 2.99" X 3.23"

8.6:1

2- Amal Concentrics R930/9, 30mm

Battery & coil, Lucas

49 bhp @ 6200 rpm

3/8" triplex X 84 links

Engine 29T X Clutch 58T

Multi-plate, wet

5-speed constant-mesh, right-foot shift


12.25:1

8.63:1

6.58:1

5.59:1

4.7:1

5/5" X .400" X 3/8" chain X 106 links

Gearbox 19T X Rear 47T

All-welded, oil-bearing large-tube backbone

Telescopic fork, hydraulic damping 2-way

Swing arm, 2 Girling dampers

10" disk, 2-piston hydraulic caliper

7" SLS drum, conical hub

3.25" X 19" Dunlop, ribbed

4.00" X 18" Dunlop, universal

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

54.5" / 140.3 cm

32.5" / 77.5 cm

5" / 12.7 cm

387 lbs/ 176 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


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



Please visit our
MOTORCYCLE BOOK STORE


Take a tour of our site...

HOME PAGE
Triumph Motorcycles
.....Bonneville
.....Tiger
.....Trophy
.....TR6
.....TR7
.....Trident
.....X-75 Hurricane
.....6T Thunderbird
.....5T Speed Twin
BSA Motorcycles
.....A65
.....A10
.....A7
.....Gold Star
.....Bantam
.....Rocket 3
Norton Motorcycles
.....Commando
.....Atlas
.....Dominator
.....Manx
Matchless-AJS Motorcycles
.....G3
.....G80
AMC-Associated Motor Cycles
Royal Enfield Motorcycles
.....Interceptor
Ariel Motorcycles
.....Square Four
Vincent Motorcycles
.....Black Shadow
.....Comet
Velocette Motorcycles
.....KSS
.....LE
.....MAC
Rickman Motorcycles
Japanese Motorcycles
.....Honda
.....Kawasaki
.....Suzuki
.....Yamaha
Cafe Racers
....Triumph Cafe Racers
.....Norton Cafe Racers
.....Other Cafe Racers
Choppers & Bobbers
.....Choppers
.....Triumph Choppers
.....Rat Bikes
Classic Racing Motorcycles

Classic Motorcycle Events
.....Auctions
.....Shows
.....Rides
Classic Motorcycle Restoration
American Pickers TV show
Classic Motorcycle Shops
Classic Motorcycle Clubs
Classic Motorcycle Photo Gallery
Send us Pictures of YOUR BIKE
YOUR BIKE Pictures

HOME PAGE
.....About Us
.....Site Map
.....CONTACT US
.....Please visit our BLOG
.....Subscribe to our FREE e-zine BRIT IRON
.....BRIT IRON E-zine Back Issues

Visit our STORE
.....Motorcycle Books
.....Motorcycle Magazines
.....Motorcycle Calendars

Crazy about cars, too? Check out our sister site:
www.American-Muscle-Cars.net


Back to top - 1974 Triumph Bonneville
1/17/15

Learn how to BUILD YOUR OWN WEBSITE, like I did.