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A comparison of the BMW R 1200 GS in pictures.
Air / oil cooled and the new 2013 air / oil / liquid cooled Beemer. The 2013 liquid cooled makes 125 horse power compared to the traditional 1200 GS makes 110 hp. There is a slight weight difference, with the liquid cooled about 5 pounds heavier.
The new Water Boxer R 1200 GS. http://www.bmwmotorcycles.com/us/en/index.html
The traditional R 1200 GS.