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TRIUMPH T120TT
Country of Manufacture: England
Year: 1968
Vin
#: Frame: RS 19717, Engine: VMT 793C,
Gearbox: 12-12820
Frame: Single vertical and seat steel tubes with duplex cradle beneath engine and gearbox
Suspension:
Front: Velocette telescopic forks with hydraulic damping
Rear: Swinging arm with twin Girling shock absorbers
Wheels: Dunlop alloy rims with spokes
Brakes:
Front :7.5”full width alloy hub twin leading shoe with
air scoop
Rear: 7” full width alloy hub single leading shoe
Weight (dry): 375 lb
Tank Capacity: 5.1 gal (US), 4.25 gal (UK), 19.3 Litres
Horsepower: 41 hp @ 6200 rpm
Gearbox: Veloce close ratio 4 speed
Engine:
Type: 4 stroke
Cylinders:1 (single OHV)
Displacement :499 cc
Compression Ratio: 9:1
Ignition: 1965-1967 Lucas magneto
1968-1970: Veloce coil
Clutch: Multi disk
Primary Drive: Chain Final Drive: Chain
Carburetors: Amal 5GP2 1 3/8”
Exhaust System: Velocette “Fishtail muffler
Top Speed: 115 mph (125 mph with racing exhaust)
Production/History: The Thruxton model takes its name from the Thruxton airfield which was the site of endurance racing battles in the 1950’s and early 1960’s. The Thruxton ranks alongside BSA’s Goldstar DBD34 Clubman, as the greatest super sports British single cylinder motorcycle of the post-war era. The Thruxton represented the ultimate development of the high-camshaft overhead valve Velocette single. It had several performance modifications over the standard Venom Clubman including a race developed revised cylinder head with improved lubrication, a larger Amal GP carburetor, a twin leading front brake conversion and a close ration gearbox. A total of 1108 Thruxton’s were built 1965-1970. Like other luxury performance motorcycle builders before them (Brough Superior- pre-war and Vincent in 1955), Velocette closed down in 1971 as a result of a combination of poor business decisions including a misguided effort into moped production, lack of development funds (for competitive new models) and family infighting
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