The Honda CB650 is a four-cylinder middleweight motorcycle manufactured from 1979 to 1985 by Honda. The machine was largely based on the Honda CB550 and had the same frame, speedometer, and tachometer as the Honda CB550 of the 70’s. The CB650’s engine had the same engine block as the CB550, but was bored out to 626 cc. The SOHC four-cylinder, eight-valve engine had added domed pistonts and produced 63 hp (47 kW) @ 9,000 rpm. The CB650’s performance was comparable to contemporary DOHC 750 cc motorcycles because of it being built on the lighter, more compact chassis of the CB550. It was Honda’s last SOHC aircooled straight-four engine, which was a culmination of the engine technology Honda up to that time.