What Causes a Motorcycle Carburetor to Leak Fuel?

[AngelaAnn]

Debris may lift the float needle and prevent it from returning to its position, causing fuel from the tank to continuously flow into the carburetor without self-closing. Since the carburetor's fuel bowl has a limited capacity, any excess fuel will leak out. Below are the relevant details: 1. Carburetor: The carburetor is one of the main components of a motorcycle, and its primary function is to supply gasoline to the engine. Due to its critical role, the carburetor is often referred to as the "heart" of the engine, highlighting its significant importance in motorcycle operation. 2. Specific Cause: The carburetor's float needle is typically made of conical corrosion-resistant rubber. Although it is corrosion-resistant, prolonged use or frequent use of low-quality gasoline can cause wear. As a result, when the worn float needle closes the fuel inlet, tiny gaps may form, allowing fuel to slowly seep into the carburetor. This raises the fuel level, eventually causing it to overflow through the drain tube.