BMW has upgraded its middleweight parallel twin-cylinder line with a larger version of the engine from the F 850 GS, which brings more character and smoothness to the new F 900 R (shown) and F 900 XR.
Since the launch of the BMW F 800 model family with the F 800 S and F 800 ST in 2006, these middleweight, parallel twin-powered motorcycles have b...
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