The 1951 Whizzer Pacemaker was as much bike as motorcycle but played a big role in cycle history. The simple design gave everyone an opportunity to experience motorized transportation. See pictures and learn about the Whizzer Pacemaker.
The 1904 Marsh motorcycle used parts made by the Marsh brothers themselves. It had a single cylinder engine that had an intake valve that opened on the cylinder's down stroke. See pictures and learn about the 1904 Marsh, a pioneering motorbike.