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Although both the BSA A65 and the Triumph 650 cc twins engines were pushrod overhead valve (OHV) units, only the Triumph had twin camshafts, which supposedly facilitated tuning for a greater power output. The BSA frame was a duplex-cradle design which was considered stiffer and stronger than the Triumph's single downtube item.
The original Triumph Bonneville was a 650 cc parallel-twin motorcycle manufactured by Triumph Engineering and later by Norton Villiers Triumph between 1959 and 1974. It was based on the company's Triumph Tiger T110 and was fitted with the Tiger's optional twin 1 3/16 in Amal monobloc carburettors as standard, along with that model's high-performance inlet camshaft.
A "Norbsa" with a BSA chassis and Norton Commando 850cc engine. The Triton was probably the most common hybrid British motorcycle. Others include the Tribsa, with a Triumph engine in a BSA frame; the Norvin, with a Vincent V-twin engine in a Norton featherbed frame; [4] and a Trifield with a Triumph engine in a Royal Enfield frame.
In 1962 Tony Godfrey and John Holder rode T120 Bonnevilles to victory in the Thruxton 500 mile endurance race, and an article in The Motor Cycle entitled "Thruxton Triumph by Bonneville" led to the development of the Triumph T120R 'Thruxton', which was hand-built by a team of Triumph technicians using specially picked components and precision ...
The BSA unit twins were a range of unit construction twin-cylinder motorcycles made by the Birmingham Small Arms Company (BSA) and aimed at the US market. A range of 500 cc (31 cu in), 650 cc (40 cu in) and 750 cc (46 cu in) twins were produced between 1962 and 1972, [1] but they were really developments of the older pre-unit A7/A10 model range with less weight. [2]
Engine displacement [cm 3] Production time: Notes: First model 1902-1904 used Minerva, JAP and Fafnir engines Second Model 1905 Triumph used their own engine for the first time, 250 were made, 3 hp Model 474 1908-1909 production up to 3000 in 1909 Model Roadster 500 1910-1913 single speed, optional rear hub clutch as the 'free engine' model ...
Introduced in 1959, for the 1960 model year, it soon needed strengthening, and was ended in 1962, with the advent of the unit engines for the 650 range. The 3TA (21) was the first unit construction twin, soon followed by the short-stroke, 490 cc "500" range. From 1963 all Triumph engines were of unit construction.
A 600 cc Triumph Daytona 600 was manufactured in 1983 by Triumph Motorcycles in their Meriden factory. It was a short-stroke twin-carburettor version of the 650 cc TR65 Thunderbird with an 8.5:1 compression ratio, but it was exhibited at the 1983 motorcycle show at the National Exhibition Centre as a new model for their (eventually unrealised ...