In 1971 Harley-Davidson entered the snowmobile market when between 80 and 100 units were manufactured for in-the-field testing. Harley-Davidson advertised the motors as “Harley’s Own” while in fact the motors were built by Aermacchi in Italy.
By 1972 production was up to 10,000 units. During this time span Harley’s parent company AMF moved the AMF snowmobile manufacturing facilities to the Harley-Davidson snowmobile manufacturing site at Oakcreek,WI. However, no more AMF snowmobiles were ever produced.
http://www.snowmobilemuseum.com/index.php?page=Sleds_on_Display&list=9&archive=0