Here is a link to a German parallel twin diesel with a 1430cc displacement. Each piston is connected to 2 connecting rods and 2 counter rotating crankshafts.
http://www.motorcyclecruiser.com/roadtests/neander_1400_turbo_diesel_motorcycle/index.html Very unique concept and very good looking. In the artice they state.... quote "the incredible diesel device I found waiting for me to ride in the Bavarian countryside south of Munich, masquerading at a swift glance as an American-style cruiser with a big parallel-twin motor that could easily resemble Triumph's forthcoming 1500cc custom, is a bike literally unlike any other" It even looks like a Triumph specifically the 1500??? Does this writer know something we don't???