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In due course, a Weslake 8-valve head became available for the Triumph motor. The Triumph engine was seen as an upgrade because the Norton 650 and 750 vertical twin engines were known to have reliability problems. [citation needed] At about 7000 rpm the piston exceeds the engineering limit for piston speed, so over-revving soon destroys the ...
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.
The TR6C Trophy Special was built at the request of Triumph's sole US distributor at the time, Johnson Motors in southern California, as a way to target the growing number of desert riders. It was fitted with Dunlop Trials Universal block-tread tires and was the model referred to as the "Desert Sled". 1968 650-cc TR6C Triumph Trophy
The Triumph Tiger Trail was a motorcycle model manufactured by Triumph Motorcycles at the Meriden factory. The Tiger Trail was made from 1981 to 1982 in both 750 cc ( TR7T ) and 650 cc ( TR65T ) capacities, and under 180 examples were built. [ 1 ]
The Triumph Bonneville T140 is a standard motorcycle with a 750 cc (46 cu in) capacity engine that was designed and built by Triumph Engineering at Meriden near Coventry.. The T140 was a continuation of the second generation in the Bonneville series developed from the earlier 650 cc (40 cu in) T120 Bonneville and was produced by Triumph in a number of versions, including limited editions, from ...
The crank was a fully machined single forging with increased big end diameter making it much stiffer and better-balanced and producing one of the smoothest running motorcycles in the Triumph range. [1] The head had smaller valves set at a steeper angle (30°). Recesses in the pistons allowed a 10:1 compression ratio.
The Triumph worker's co-operative at the Meriden factory re-introduced the Thunderbird model name to their range in April 1981. [6] The Triumph TR65 Thunderbird 650 cc parallel-twin was a short-stroke version of the 750 cc T140 Bonneville engine and was the cheapest model in Triumph's range with budget features such as a drum rather than disc rear brake, the absence of a tachometer, a merged ...
The Rocket 3/Trident was part of Triumph's plan to extend the model range beyond their 650 cc parallel twins. It was the last major motorcycle developed by Triumph at Meriden, West Midlands, created to meet the demands of the US market. Although BSA experienced serious financial difficulties, 27,480 Rocket 3/Tridents were produced during its ...