In the Harley-Davidson motorcycle lineup, FLH is a model designation that has been used to represent certain touring motorcycles. Here's what FLH stands for:
F: The "F" in FLH stands for the engine type. In this case, it refers to a Big Twin engine with a 74-cubic inch (1,200cc) displacement. Over the years, the engine sizes have increased, so the "F" may also indicate larger engine sizes like 80 cubic inches (1,340cc) or 88 cubic inches (1,450cc).
L: The "L" in FLH represents the frame type. In Harley-Davidson's nomenclature, the "L" signifies a bike with a "Big Twin" frame. The Big Twin frame is a large, full-size frame designed to accommodate larger displacement engines and provide stability and comfort for long-distance touring.
H: The "H" in FLH indicates that the motorcycle is equipped with a hydraulic front fork suspension system. This signifies that the motorcycle has a front suspension with hydraulic dampers to provide improved handling and ride comfort compared to older models with rigid front forks.
Together, FLH represents a specific type of Harley-Davidson touring motorcycle with a Big Twin engine, a Big Twin frame, and hydraulic front fork suspension. However, it's important to note that Harley-Davidson has used various model designations and naming conventions throughout its history, and the specific meanings of these designations may have evolved or changed over time.