Why Does a Motorcycle Leak Oil When It Falls Over?
2 Answers
When a motorcycle is upright, the fuel level is controlled by the float and float needle inside the carburetor. When the motorcycle falls over, the fuel level becomes uncontrolled, so it is normal for gasoline to leak when the motorcycle is down. Below are specific details on carburetor maintenance: 1. Cleaning the carburetor and fuel injector: This mainly involves cleaning the idle valve and filter screen. These cleaning tasks should be performed at a professional maintenance and repair center, as roadside repair shops lack the necessary professional equipment, and improper cleaning won't provide any benefits. 2. Cleaning the carburetor should be done in a clean area: The exterior surface of the carburetor should be wiped clean, and internal components can be cleaned using carburetor-specific cleaner or industrial gasoline. In addition to removing impurities, attention should be paid to cleaning gasoline deposits from the surfaces of the components. After cleaning, the parts should be blown dry with compressed air. Avoid using cloth or paper that may leave fibers, as this can cause recontamination.
With over a decade of auto repair experience, I've seen many motorcycles leak oil when they tip over. The main cause is usually a cracked oil pan or oil pipe upon impact, such as when the bike falls and hits a hard object, causing the oil line joints to burst open. Additionally, a loose fuel tank cap can lead to fuel or oil spillage, especially in high temperatures when the sealing ring is more prone to damage. Once, while inspecting a customer's bike, an old motorcycle leaked oil all over the ground after tipping over because the oil pan had rusted and thinned, cracking at the slightest touch. It's important to park on level ground and ensure the bike is stable, and to regularly maintain and replace sealing components to reduce such incidents. Safety comes first—oil leaks after a fall not only dirty the ground but also pose a fire hazard, so it's best to repair them promptly.
