Maintenance and Care of the Carburetor of a Lawn Mower

Maintenance and Care of the Carburetor of a Lawn Mower

The carburetor can be regarded as the "heart" of the engine. It will automatically adjust the concentration according to the different working conditions of the engine and output the corresponding amount of mixture to ensure the normal operation of the engine. 

The float-type (self-weight type) carburetors are applicable to lawn mowers, rototillers, leaf blowers, blowers and wheeled hay cutters. 

Common Faults and Maintenance Methods of Carburetors

Leaking of Fuel from Carburetor

Reason 1: The engine is tilted too much during operation or storage, causing the float of the carburetor to lose its buoyancy and the needle valve to not be fully sealed, resulting in fuel leakage.

Maintenance Measures: Adjust the carburetor to a reasonable angle for normal operation, clean the fuel, and then start the engine again.

Reason 2: The float of the carburetor is not sealed properly, and fuel flows out through the balance hole.

Maintenance Measures: Remove the fuel cup of the carburetor, clean all components, and clear any stuck parts of the float and needle valve.

Reason 3: The sealing parts of the carburetor are aging, causing oil leakage at the assembly position between the oil cup and the body or at the balance hole.

Maintenance Measures: Replace the "O-type" seal ring or the needle valve.

Engine idling, backfiring, popping, and excessively high speed

Reason 1: The fuel cleanliness is not up to standard, and the working environment is poor, with impurities blocking key components, causing insufficient fuel supply.

Maintenance Measures: Clean the carburetor with clean fuel or kerosene, and dry it with high-pressure air flow (if possible), and wait for the fuel or kerosene to naturally evaporate before assembling and using.

Reason 2: The choke valve is not fully opened, and the mixture is not well atomized, causing abnormal engine combustion, resulting in idling backfiring, low speed, and even load shutdown.

Maintenance Measures: Adjust the position of the choke valve to fully open.

Reason 3: The throttle plate of the carburetor is stuck and cannot adapt to changes in working conditions, causing a change in the mixture, resulting in little or no significant change in engine speed during loading and excessively high idle speed.

Maintenance Measures: Remove the throttle plate, reassemble, or replace the carburetor.

3 Maintenance

Maintenance for Carburetors of Engines That Have Not Been Used for a Long Time:

When the engine is not in use, the fuel switch should be turned off, and then the fuel in the float chamber should be drained through the drain bolt (see Figure 2) and the engine should be stored.

Regular Maintenance:

Comply strictly with the relevant regulations for engine air filter maintenance to carry out regular maintenance of the air filter, ensuring the cleanliness of the carburetor interior; try to use fuel with high cleanliness or add fuel filter elements to ensure the cleanliness of the fuel, thereby fundamentally preventing impurities from entering.