The oil tank on the side of a Harley-Davidson motorcycle serves the purpose of storing and circulating oil to lubricate the engine. It is an essential component of the motorcycle's lubrication system.
The oil tank holds a sufficient amount of oil to ensure proper lubrication of the engine's moving parts, such as the pistons, crankshaft, and bearings. It helps to reduce friction and wear, which is crucial for the smooth operation and longevity of the engine.
In addition to storing oil, the tank also houses various components that are integral to the lubrication system. This includes an oil pump, which is responsible for drawing oil from the tank and pumping it through the engine to provide adequate lubrication. The oil tank also contains a filter to remove impurities and contaminants from the oil, ensuring that only clean oil reaches the engine.
Harley-Davidson motorcycles have traditionally featured an external oil tank, often referred to as the "oil bag," located on the side of the motorcycle. This design choice adds to the iconic look and aesthetic appeal of Harley-Davidson bikes. However, it's worth noting that newer Harley-Davidson models may have variations in the design and placement of the oil tank, depending on the specific model and year.