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What Causes Oil Leakage in Motorcycle Carburetors?

1 Answers

VanJuliette

07/30/25 2:37am

Motorcycle carburetor oil leakage can be attributed to the following reasons: Foreign matter adhering to the contact surface between the needle valve and valve seat: The needle valve and valve seat control the fuel intake and require strict sealing, with high surface smoothness. If foreign matter adheres to the contact surface, it will cause poor sealing between the needle valve and valve seat, resulting in oil leakage. Foreign matter mainly refers to impurities and condensed gum in gasoline. To prevent such faults, users should pay attention to regularly cleaning the gasoline filter and using high-quality gasoline. Needle valve wear: During use, the needle valve wears due to long-term erosion by impurities in gasoline and contact with the valve seat; uneven adjustment at both ends of the float causes the needle valve to bear lateral force and wear. Needle valve wear leads to poor sealing with the valve seat, resulting in oil leakage.

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