Updates: Some History HERE
And Luis Font from the comments: Hi, the Yankee was a cooperation between the spanish brand Ossa, who suplied engines, and some entrepeneurs in USA. But it does not arrived on good term and failed. In Spain it was sold as Ossa Yankee, a fastest on road 500 twin. But his thirst for fuel was the biggest problem in spite of the publicity promised 70 hp. You can see part of the history at this web: http://motoguapa.lamaneta.net/Yankee3.html
Also a good post on this same bike over on Bike Exif
Good Stuff. Thanks!
What an amazingly cool bike. Big powerful 2 stroke that looks to be very well engineered. Wish I knew more about them. I’ll do a little research and update in a bit. Anybody out there into them?