What makes XS650Chopper.com Awesome? Featured interviews with tons of pics and detail on guys building the sickest Yamaha's on earth!! The XS650, in America and Worldwide has developed a cult following for good reason. At the heart of the XS is a indestructible engine. The best parallel twin ever built.. Tough durability, classic look and abundance of cheap parts make the XS650 the perfect platform to build a KILLER Yamaha xs650 hardtail or café racer. Drool. Build. Ride Safe.