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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 ...
650 1956–1968 Single carburetor model. TR6C Trophy: 650 C is the 'Competition' Model. High pipes on left side. Frequently referred to as desert sleds when used for racing in the Western US. Lower overall gear ratios. TR6P Saint 650 1967-1973 Police version of the unit construction Trophy. Named the "Saint", an acronym for "Stop Anything In No ...
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 ...
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 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 ...
An eight valve cylinder head conversion (700cc) for Triumph 650cc twins was developed in the late 1960s which considerably increased power output (up to 60 bhp or more depending on state of tune) and showed up some weaknesses in the Triumph crankcases and connecting rods.
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 ]
Triumph Engineering Co Ltd was a British motorcycle manufacturing company, based originally in Coventry and then in Meriden.A new company, Triumph Motorcycles Ltd, based in Hinckley, gained the name rights after the end of the company in the 1980s and is now one of the world's major motorcycle manufacturers.