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The original CB100 was produced between 1970 and 1973 aimed as a basic commuter model. It was a lively air-cooled, single cylinder, 4-stroke engine with 2 valves per cylinder and a 5 speed gearbox.

The CB100 was followed by the larger CB125 a couple of years later and didnt reappear in 100cc form until the CB100N came along with a major restyling in 1979.