The XA used an opposed twin, 45ci shaft-drive engine, reverse-engineered from the powerplant BMW used in the R71. It was a flathead and came tied to a 4-speed transmission. Harley started work on ...

The result was a limited production run of 1,000 units from Harley out of their Milwaukee, Wisconsin factory, Codenamed the XA (Experimental Army), this bike used a very similar two-cylinder boxer ...

Mecum is auctioning a rare 1942 Harley-Davidson XA military motorcycle from World War II that boasts many early engineering firsts in the company's long history. Developed after the U.S. and its ...