This is a rare find, brand new still in the original box Hirth 493 motor, type 220RE, serial # 611736. Motor was manufactured in West Germany around 1967 and used in AMF snowmobiles. Motor still has the original intake and exhaust cover plates in place. Motor has been well stored as you can see in the photos. It is my understanding this motor was also used in Polaris sleds as well. However, according to the box it was manufactured for AMF in York, PA.