What does XS stand for in the Yamaha XS series of motorcycles?

The first one (and the one I suspect is most likely correct) is that it stands for “eXperimental Standard”, referring to the fact that the original XS-1 engine design was Yamaha’s first attempt at building a four-stroke engine which would become the foundation for all future four-stroke twins. read more

The Yamaha XS650 is a mid-size motorcycle made by Yamaha Motor Company. The standard model was introduced in October 1969,and produced through 1979. The"Special" cruiser model was introduced in 1978 and produced through 1985. read more