Designed to appeal to the US market, the TSS had an eight valve Weslake Engineering cylinder head developed by Triumph's Brian Jones from a 1978/9 design originally commissioned from Nourish Racing of Rutland following 1960s designs for the 650cc twins by the Rickman Brothers. 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. The head had smaller valves set at a steeper angle (30°). Recesses in the pistons allowed a 10:1 compression ratio.
UK models had a pair of 34 mm Amal MkII carburetors while the export models had Bing constant velocity carburetors. Other changes from the standard T140E included offset connecting rods, steel-linered alloy barrels, a strengthened swinging arm, and a high output three-phase alternator. A modified TSS raced by Jon Minonno for Texan Jack Wilson's Big D Triumph dealership achieved outstanding results in the Battle of the Twins races for 1981-1982.
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