BMW introduced an inline six-cylinder café racer concept at the 2009 EICMA show in Milan, Italy.
Inline-six engines have a staple in BMW’s automobiles for decades and the German manufacturer’s motorcycle division took on the challenge of adapting the straight-six to a bike without making it too long or too wide. The result is the BMW Motorrad Concept 6, and an evolution BMW says “will further expand the K-Series in the foreseeable future”.
The Concept 6’s engine is about four inches slimmer than BMW’s production inline-six engines, making it just a bit wider than a large-capacity four. To keep the width down, the engine has a relatively long stroke with very small gaps between cylinders. Electrical ancillaries and their drive components are positioned behind the crankshaft and above the transmission to further minimize engine width.
More details on Motorcycle.com
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