Triumph 350 and 500 Unit Twins 1957-1973 Models –
Twenty-One (3TA) 348cc 1957 to 1966T90 348cc 1962 to 1969Speed Twin 5TA 490cc 1958 to 1966T100 models 490cc 1959 1974
Engine – Petrol: 348 & 490cc air-cooled unit construction twin-cylinder
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