Most models had six-speed gearboxes, enabling the factory tuner to raise engine speed with the consequent narrowing of the power band.

In the fall of 1965, they introduced the T20 Hustler twin (aka X6 or Super Six) as a 1966 model with 250 cc displacement, automatic oil injection and the world's first six-speed transmission in a production motorcycle.

The "Cobra" model name was dropped at the end of the first year of production, apparently after Suzuki received a letter from the Ford Motor Company's legal department.

In Australasia the T350 Rebel developed legendary status after the triumph of racer Joe Eastmure over much larger super bikes in both the 1972 and 1973 6 hour race at Amaroo, Australia.

The key differences were a less well finished petrol tank which had a narrow raised seam running along the centre top and black painted exhaust instead of all chrome.

Unlike the 250, 350 and 500 models the 125 and 90 had cast iron barrels with aluminium heads angled well forward into the slip stream to lower engine temperature.