Kawasaki Aircraft initially manufactured motorcycles under the Meguro name, having bought an ailing motorcycle manufacturer, Meguro Manufacturing with whom they had been in partnership. This eventually became Kawasaki Motor Sales. Some early motorcycles display an emblem with "Kawasaki Aircraft" on the fuel tank.

In 1962, Kawasaki engineers were developing a four-stroke engine for small cars. Then some of the engineers transferred to the Meguro factory to work on the Meguro K1 and the SG, a single-cylinder 250 cc OHV.1963 Kawasaki and Meguro merged to form Kawasaki Motorcycle Co, Ltd. Kawasaki motorcycles from 1962 through 1967 used an emblem which can be described as a flag within a wing.