 A version of the B40 was also produced (in considerable quantities) for various branches of the military.These motorcycles (known as the "Ex-WD B40") were more rugged than the vanilla version (in particular, the timing-side main bearing was over- rather than under-engineered and an oil filter was fitted), slightly de-tuned and given a version of the competition frame.For these reasons, these bikes can make very good buying, and are often used as the basis for competition machines.