September 26, 2014 Comments off  The 2014 Yamaha YZ450F.  The
reverse cylinder of the 2010-2015 Yamaha YZ450F and  2014-2015
YZ250F may seem incredibly original, but that is not true—it is
a very old idea. The MXA wrecking crew scoured our memories, and
those of our grandfathers, to come up with a fair-to-middlin’
list of reverse cylinder engines. We promise you that there are
many more reverse cylinder engines produced over the years, but
focused on the most significant.  1922 Opel 204cc Motoclub.  The
first example we found was the 204cc Opel Motoclub, It was a
water-cooled, OHV, four-stroke with the cylinder turned around
backwards. It was produced from 1922 to 1925. The Opel company
would later specialize in automobiles.  1925 Orionette TS 246.
1927 Zachka helicopter.  Designed in 1927, Engelbert Zaschka’s
helicopter was a combination of an autogyro and a helicopter. In
appearance, the Zachka helicopter looks like a typical airplane
of the era, but the wing revolved around the fuselage of the
plane. His