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The 1971 Triumph Bonneville was a totally new bike. Only the engine carried over from 1970. Not since the 650 twin went unit construction in 1963 had so extensive a redesign taken place. 1971 model year started for the Triumph T120 Bonneville with Engine #NE01436. While the new frame & running gear were getting all the attention, the engine received some updates also. More info on this bike HERE
