1961 Matchless G12
650 Twin

1961 MATCHLESS G12 BACKGROUND
Just prior to World War II, Triumph rocked the world with their seminal 500 Speed Twin, but the world had to wait for the war to end before the rest of the industry would have a chance to catch up. At war's end, BSA was first to respond with their own 500cc vertical twin, the 1946 A7. Norton was next, followed by Matchlessfollowed in 1949, Norton with the Model 7, and Matchless with their G9. Of course, every Matchless came with a matching AJS back then (and they called them "Matchless"), in this case the AJS Model 20. Triumph being the first one to the party, they were also the first to start upping the ante in the horsepower-wars. In 1950, they bored and stroked out their own 500 to make the world's first Triumph 650, the 6T Thunderbird, and most of the rest of the industry followed suit the best they could. Matchless and AJS countered in kind, bumping their 500's displacement up to 650cc in 1958, along with new names, the Matchless G12 and the AJS Model 31. These were followed in turn by a larger version still, the 750cc Matchless G15 and AJS Model 33 in 1963.

1961 Matchless G12 SPECIFICATIONS

Model Designations, Matchless/AJS
Engine type
Displacement
Bore & Stroke
Compression ratio
Lubrication
Oil capacity
Fuel system
Ignition System
Power output
Battery
Primary drive
Clutch
Gearbox
Final drive
Suspension, front
Suspension, rear
Brakes, front
Brakes, rear
Frame type
Tire, front
Tire, rear
Dry weight
Fuel capacity
Fuel economy
Top speed
G12 / Model 31
Air-cooled OHV vertical twin
646cc / 39.4 ci
72mm X 79.3mm
7.5:1
Dry sump
2.5 L / 5.3 US pints
1 - Amal 389 1-1/8"
Lucas distributor & points
35 hp @ 6,500 rpm
Lucas 6V 12aH
1/2" X 5/16" single chain
Multi-plate, wet
4-speed, right-foot shift
5/8" X 3/8" chain, 96 links
AMC Teledraulic forks
Swing arm w/2 shocks
7 -n SLS drum
7-in SLS drum
Double cradle
3.25" X 19" Dunlop
3.50" X 19" Dunlop
396 lbs / 180 kg
4.5 US gal / 17 L
55 mpg / 23.4 km/L
95 mph

Check out these MATCHLESS BOOKS

MATCHLESS, ONCE THE LARGEST BRITISH MOTORCYCLE MFR


HISTORY OF MATCHLESS MOTORCYCLES, KINDLE


MATCHLESS MAINTENANCE MANUAL 1939-1955 SINGLES


BOOK OF MATCHLESS 350 & 500 SINGLES 1945-1956


BOOK OF MATCHLESS 350 & 500 SINGLES 1955-1966


MOTORCYCLE APPRENTICE: MATCHLESS - IN NAME & REPUTATION


MATCHLESS & AJS RESTORATION, ROY BACON


MATCHLESS: THE COMPLETE STORY


AJS & MATCHLESS GOLD PORTFOLIO 1945-1966


AJS: THE COMPLETE STORY


SERVICE & OVERHAUL MANUAL: AJS & MATCHLESS SINGLES


SERVICE & OVERHAUL MANUAL: AJS & MATCHLESS TWINS


MORGAN 3-WHEELER: THE COMPLETE STORY






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Last updated 11/29/16

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