Harley-Davidson motorcycles actually do have valves. Valves are crucial components in internal combustion engines, including those used in Harley-Davidson motorcycles, as they control the flow of air and fuel into the combustion chamber and the expulsion of exhaust gases.
Harley-Davidson engines typically use a design known as the "pushrod V-twin" or "overhead valve" (OHV) engine. In this design, the valves are located in the engine block, and they are actuated by pushrods and rocker arms. The pushrods are driven by the rotation of the camshaft, which is located in the engine block as well. This configuration allows for a compact and reliable valve train.
Regarding cleaning the valves, maintenance procedures may vary depending on the specific model and year of the Harley-Davidson motorcycle. However, in general, valve cleaning is part of regular maintenance schedules and is typically performed by trained technicians. The process involves disassembling the necessary components to access the valves, such as removing the cylinder head cover. The valves can then be cleaned using specialized tools and solvents to remove carbon deposits or other buildup. This helps ensure proper sealing and optimal engine performance.
It's important to note that while valve cleaning is a regular maintenance task, it is not something that typically needs to be done very frequently. The interval between valve cleanings can vary depending on factors such as the motorcycle's usage, operating conditions, and the specific recommendations outlined in the owner's manual. It's always best to consult the owner's manual or seek assistance from an authorized Harley-Davidson service center for specific guidance on maintaining and cleaning the valves of a particular model.