The Honda CB650 is a 627 cc (38.3 cu in) standard motorcycle produced from 1979 to 1985. It featured a four-cylinder, SOHC, air-cooled, wet sump engine, with two valves per cylinder. The CB650 was a development of the CB550, itself derived from the even earlier CB500. The CB650 was the last of Honda's successful series of air-cooled SOHC fours that began in 1969 with the Honda CB750.