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Core Technical Specifications
The K-Series is an L-head (flathead) design, where the valves are located in the block rather than the head. This makes for a simple, compact mechanical profile that is easy to service, though slightly less efficient than modern overhead valve (OHV) designs.
Kohler K91/K141/K161/K181/K241/K301/K321/K341 Single Cylinder Engine Service Manual
Kohler Technicians Service Program 2006–2007
K-Series, Magnum, Command, Aegis and Triad Crankshafts Manual