Some motorcycle carburetors will appear in various situations of oil leakage, if the external oil leakage, the direct performance is the appearance of dirty, if the internal oil leakage, although there is no change in the appearance, but the car will appear many inexplicable failures.

Carburetor feed system is a dynamic balance system. Under the action of gasoline buoyancy, the float in the float room drives the needle valve to constantly adjust the gap between the needle valve and the seat to control the oil intake, so that the oil level in the float room of the motorcycle can maintain dynamic stability under various working conditions. The oil leakage of the carburetor is caused by the destruction of the above balance system. Carburetor oil leakage not only increases fuel consumption, affects the performance of the vehicle, but more importantly, causes greater harm to the safety of the vehicle, which needs to be eliminated in time. So why does the carburetor leak? How do you rule it out?

First, the main oil needle is stuck by a foreign body, resulting in continuous oil leakage at the oil level

Reason: Needle valve and valve seat is to control the amount of oil, its sealing requirements are strict, the contact surface of the two is very high finish. If a foreign body is attached to the contact surface of the needle valve and the seat, the needle valve and the seat will be loosely sealed, resulting in oil leakage. Foreign bodies mainly refer to impurities and condensation in gasoline, so to avoid such failures, owners should pay attention to regularly clean the gasoline filter and use good quality gasoline. Elimination method: Decompose the carburetor, clean the float chamber and the main oil needle and its valve.

Second, the needle valve wear and close the leak causes: ① the needle valve in the process of use due to long-term erosion of impurities contained in the gasoline and contact with the valve seat wear ② The float float at both ends of the adjustment imbalance, driving the needle valve side force and wear. The needle valve is leaky due to wear and loose seal with the seat. Elimination method: ① Replace the needle valve, and the user should pay attention to regularly clean the gasoline filter and use good quality gasoline. ② Replace the needle valve, and adjust the two ends of the float float to the same level. However, in this case, the repairman will replace your entire carburetor assembly.

Third, the float is stuck and can not close the needle valve, resulting in oil leakage causes: ① the float after long-term immersion in gasoline expansion deformation and contact with the wall of the float chamber. ② The gap between the float pin and the float pin hole of the body expands after long-term friction, resulting in the float contacting the wall of the float chamber. The float can not return the needle valve due to hairpin, resulting in oil leakage. Elimination method: ① Replace the float if the float is deformed. ② If the float pin outer diameter wear becomes smaller, replace the float pin, if the body float pin hole wear becomes larger, you can only replace the carburetor assembly. Again, repairmen usually replace the assembly directly.

Fourth, the float is damaged or immersed in gasoline to lose buoyancy causes oil leakage: the float is damaged or immersed in gasoline will make the weight and buoyancy of the float change, resulting in the rise of the oil surface, causing oil leakage. Elimination method: Replace the float.

The above listed situation basically covers the main aspects that lead to oil leakage, but in the exclusion method, can only say that the owner of the hobby maintenance friends do it themselves, because the repairman has rarely given you maintenance, time-consuming and laborious not to say, there is no profit, so the general replacement of carburetor assembly.

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