How to maintain the carburetor, do you know these?

It may be very important for small parts and components. Therefore, in order to ensure the normal use of the carburetor, we must pay attention to the normal maintenance of the carburetor. Then let's learn how to maintain the carburetor. Come and see with me.

How is the carburetor maintained: cleaning

How to maintain the carburetor, do you know these?

1. The carburetor is a key component in the engine, and minor changes may affect the performance of the vehicle. Therefore, during the disassembly and assembly process of the carburetor, appropriate tools should be used and the force should be moderate to prevent deformation of the parts. The disassembled parts should be neatly arranged in order to prevent missing or wrong assembly during assembly.

2. The cleaning of the carburetor should be carried out in a clean place. First wipe the outer surface of the carburetor, and use the special cleaning agent for carburetor or industrial gasoline to clean the internal parts. In addition to impurities, pay attention to cleaning the gasoline gum on the surface of the parts. The cleaned parts should be blown clean with compressed air, and cannot be wiped with cloth or paper that will produce burrs to prevent re-contamination. Blocked holes should not be opened by hard objects such as steel wires to prevent changes in the performance of the carburetor caused by changing the hole diameter. Gasoline or compressed air should be used to clean and flush out.

3. During the assembly process of the carburetor, the connecting screw of the float chamber, the connecting screw of the carburetor and the engine should not be tightened at one time, but must be tightened several times. Generally, the tightening torque is between 12N.m and 15N.m. Otherwise, the joint surface will be deformed, and air leakage or oil leakage will occur. The tightening torque of measuring hole parts is generally between 1.5N.m and 3.0N.m. Excessive tightening torque will damage the thread, cause deformation of the parts, and even produce metal chips, causing secondary pollution and affecting the performance of the carburetor.

How is the carburetor maintained: the reason for the unstable idle speed of the carburetor

How to maintain the carburetor, do you know these?

1. The idle speed measuring hole is partially blocked

Reason: The idle speed measuring hole is partially blocked, so that the oil supply is lean in the idle speed state, resulting in the phenomenon of idle speed instability.

Remedy: Clean according to the aforementioned carburetor cleaning method.

2. The position of the idle speed adjustment screw (commonly known as "air needle") changes

The function of the idle speed adjustment screw is to change the flow section of the idle speed oil passage or air passage by adjusting the idle speed adjustment screw, so that the carburetor idle oil supply can reach an ideal state. The idle speed adjustment screw can be divided into two types: oil adjustment (such as CG125 carburetor) and air adjustment (such as Mulan 50 carburetor).

How is the carburetor maintained: the solution

best adjustment

First, fix the plunger to the engine speed with a slightly higher idle speed, turn the idle speed adjustment screw left and right to find the maximum speed at the position of the plunger, adjust the plunger adjustment screw slightly to reduce the engine speed and then find the maximum speed, so Repeat until the maximum speed at a certain plunger position is equal to the standard idle speed of the whole vehicle. For a four-stroke engine, sometimes the CO concentration is still very high after the best adjustment is done. In this case, the Paris adjustment method can be appropriately used.

How to maintain the carburetor, do you know these?

(2), Paris adjustment method

The Paris adjustment method is carried out on the basis of the best adjustment method. It intentionally rotates the idle speed adjustment screw in the direction of making the mixture thinner (at most only 1/8 of a turn is allowed). At this time, the speed should be reduced, Then turn up the plunger to return it to its original speed. As a result of the adjustment, the HC value is slightly increased and the CO value is decreased. The principle is that HC cannot rise too much, and CO can be slightly lower than the standard. If the results of the Paris adjustment method make CO meet the standard, but make the HC exceed the standard is not allowed. If CO and HC cannot meet the standards at the same time, it means that the carburetor cannot meet the emission requirements when the conditions do not change. It can also be seen here that limiting CO and HC can ensure the rationality of the adjustment. Otherwise, the CO will be lowered blindly, the result will be too high HC, and the combustion will be in an extremely unreasonable state.