Carburetor adjustment methods and skills

Before the oil enters the cylinder for combustion, it must first go through an atomization process to mix the oil with air to become oil and gas for combustion. The concentration of oil and gas after atomization is called the mixing ratio.

The mixing ratio is also known as"Air-fuel ratio", the English way of writing is:"a/f", i.e. air fuel, the ratio of air to fuel. When mentioning concentration, try to use oil and gas"Thick"or"Light"to describe, if to speak"High"or"Low"The time refers to the a-f ratio"Air-fuel ratio"。So oil and gas"Thick"When there is more oil and less air, the ratio of a f"Low"；On the contrary, oil and gas"Light", less oil and more air, the A-F ratio is high.

That's what I have to say to you first.

What is the effect of the difference in mixing ratio on the car? The oil and gas are too thin, and the engine is easy to overheat, which can easily lead to stalling or even shrinking. The oil and gas are too concentrated, which consumes more fuel, and it is easy to stall after the car is hot, and it is easy to deposit carbon in the engine for a long time.

If the carbon deposit is too severe, it is easy to overheat the engine. Therefore, it is not a good thing to be too thin or too thick, especially when it is too thin, it will directly have adverse effects.

How do you know if the mixing ratio is correct? The easiest way to do this is from a spark plug.

color to judge. Remove the spark plug and look at the electrode part of the spark plug:

Oil and gas normal: white (or light brown to white).

Oil and gas normal: brown.

Oil and gas are too concentrated: black (dark brown to black).

In this way, you can roughly see whether the mixing ratio is correct or not according to the combustion situation.

in carburetor. There are many factors that affect the mixing ratio, but the most well-known one is the mixing ratio screw on the carburetor. This is the easiest way to adjust the mixing ratio, generally speaking, adjusting the mixing ratio, but also refers to the mixing ratio screw.

Therefore, in this article, we will only talk about the principle and adjustment method of the mixing ratio screw, and other factors involving the mixing ratio will not be discussed for the time being, so as not to know where to start.

The mixing ratio screw is located on the carburetor and can be found on the carburetor housing, usually as a small slotted flat-head screw (the larger ones can be turned by hand are usually idle screws), although there may be exceptions, depending on the type of car or carburetor type.

How does the mixing ratio screw control the mixing ratio? This starts with the structure of the carburetor, the center of the carburetor is hollow, which is the basic structure of the carburetor, the air will flow quickly from this place, and the oil will be sucked up through the nozzle to achieve the function of oil and gas atomization. According to this basic structure, the ratio of air intake and oil intake is not easy to adjust, so the general practice will be to design a small air path on the outside, so that the air can also be introduced through this air path at the same time, and then make a small valve on this air path to control the air intake volume of this bypass air path, so as to achieve the purpose of adjusting the mixing ratio.

The mixing ratio screw is located in this air path and is used as a valve, by adjusting the mixing ratio screw.

The way of screwing out can achieve the effect of different opening and closing degrees of the valve to adjust the amount of bypass air.

Motorcycle carburetor, oil level adjustment skills do you know? The car repair master will tell you in detail.

1. First of all, let's get to knowCarburetorsAdjustment Diagram:

2、'l'Adjustment method of needle valve:

1) The "L" state of the carburetor is delayed by the adjustment valve clockwise.

Screw it to the end, and then set the initial value according to the parameter value in the above chart.

2) After adjusting the initial setting, continue to rotate counterclockwise to the highest point of rotational speed, which is the turning point when the rotational speed changes from high to low when readjusting.

3) Then adjust the idle speed counterclockwise.

Scythe to reach the rotational speed value in the table. As shown in the table, the CS-352ES is 3800RM.

4) Continue to adjust the L-needle valve counterclockwise to the parameter value in the table. For example, the CS-352ES is 2800RM.

3、'h'Adjustment method of needle valve: adjust H needle valve after adjusting the L needle valve.

1) When adjusting the H-needle valve, it must be adjusted when the throttle is maximum, but it must be noted that it should not exceed 5 seconds when rotating at high speed, otherwise the machine will pull the cylinder due to too high speed.

If you need to continue adjusting, it is best to adjust after 5-10 seconds.

2) Adjust the H-needle valve counterclockwise to confirm whether the speed has dropped; If the speed keeps rising, you need to continue to adjust counterclockwise until the turning point when the speed decreases.

3) Then continue to adjust the H-pin valve by counterclockwise rotation until the range of the rotational speed value in the above chart. As shown in the table, the CS-352ES is 11700-12700RM.

Notes: 1. TAS: idle belt adjustment screw WOT: maximum high speed.

2. The initial setting of the H and L needle valves: rotate the H and L needle valves clockwise to immobility, and then twist them back a little; Then adjust the number of turns according to the value in the above table, and adjust it counterclockwise.

3. * (with an asterisk) *l needle valve first rotates counterclockwise, until the sound of "bell" is heard, and then clockwise according to the number of rotations in the above table to adjust. Such as SRM-336ES, PB-770, etc.

4. The H needle valve list in the table sail quietly plums", indicating that this model does not have an H needle valve and does not need to be adjusted. Such as EB-8520RT, etc.

5. TAS (idle screw) initial setting: firstly, rotate the adjusting screw counterclockwise to not touch the throttle block, then adjust the tip of the adjustment screw clockwise just touching the throttle block, and finally adjust the number of rotations clockwise according to the table above.

6. TAS (idle screw) **with two**asterisk) first rotate the adjusting screw clockwise to the end, and then adjust the number of counterclockwise turns according to the table above. Such as HCR-165ES, HCS-3020ES, PPT-265ES, etc.

7. When the highest point of low speed is found, if the blade chain rotates, it is necessary to adjust the idle screw to the blade chain does not move, and then find the highest speed of low speed, such as the blade chain rotates again, repeat the above actions.

8. For the special ignition system, the screws need to be adjusted clockwise to the allowable low speed range after the oil-rich deceleration.

Carburetor adjustment method and skills: The "L" adjustment valve of the carburetor is screwed clockwise to the end, and the initial value of the parameter value is set. After the initial setting, the counterclockwise rotation is the turning point when the rotational speed changes from high to low when adjusting.

Adjust the engine's idle speed to about 900 rpm. Fine-tune the mixing ratio screws left and right, and the idle speed will rise and fall back and forth during the adjustment process. Adjust the mixing ratio screw to a stop at the highest idle speed.

Finally, reduce the idle speed back to the appropriate speed, at this time, when the mixing ratio screw is removed, if the speed will drop when the left and right rotations are rotated, then it is the best carburetor mixing ratio.

It is also necessary to check the tightness of the connection parts related to the carburetor to ensure that the carburetor suction is normal and there is no air leakage or suction blockage. Rotate the carburetor mixing ratio screw clockwise all the way to the end, then rotate the circle counterclockwise. Start the engine and let the engine warm up for 10 minutes to bring the engine to normal working temperature.

Adjust the carburetor mixing ratio screws left and right repeatedly to reach the highest engine speed. In this process, some friends will find that after the mixing ratio screw is adjusted to a certain position, it is rotten early, and then rotate the mixing ratio screw in the counterclockwise direction, and the idle speed will not change.

Summary. The following are the steps for adjusting the oil-gas mixing ratio of the carburetor: the first step is to adjust the idle speed of the engine to about 900 rpm; In the second step, the mixing ratio screws are fine-tuned left and right, and the idle speed will rise and fall back and forth during the adjustment process; The third step is to adjust the mixing ratio screw to a time when the idle speed is at its highest. The fourth step is to reduce the idle speed back to the appropriate speed, and then the mixing ratio screw is removed, and if the speed decreases when the left and right rotations are rotated, then the best carburetor mixing ratio is at this time.

The carburetor is a key part of the fuel supply system of the old gasoline engine, and its function is to atomize the gasoline and air into a mixture according to a certain ratio of excitation, and then enter the gas cylinder for combustion according to the needs of various working conditions of the engine. Modern cars do not use carburetors, but use electronic control systems to control the fuel supply.

The following are the steps for the automotive carburetor to adjust the oil-gas mixture: the first step is to adjust the idle speed of the engine to about 900 rpm; In the second step, the mixing ratio screws are fine-tuned left and right, and the idle speed will rise and fall back and forth during the adjustment process; The third step is to adjust the mixing ratio screw to a time when the idle speed is at its highest. The fourth step is to reduce the idle speed back to the appropriate speed, at this time, when the mixing ratio screw is turned, if the speed will drop when the left and right rotations are rotated, then it is the best carburetor Huai coarse mixing ratio.

The above is the carburetor adjustment method and skills, the carburetor has the advantages of simple structure, reliable work, cheap and convenient maintenance, but its biggest disadvantage is that it can not control the concentration of mixed rock gas in the fine rolling hole, resulting in incomplete combustion, and the increase of harmful components in the exhaust gas, which does not meet the strict requirements of today's environmental protection. However, small agricultural machinery such as seeders, micro-cultivators, sprayers and motorcycles are still equipped with a royal carburetor to control the fuel supply of the engine.

Dear, you are very happy to serve you The adjustment methods and tips for carburetors are as follows: first check whether the air filter is clean, clean or replace the necessary filter elements. Find the adjusting screws on the carburetor, there are generally three:

Idle screws, air-fuel ratio screws, and main valve screws. Adjust the idle screw, first adjust the engine idle speed to normal operation, and then slowly rotate the screw until the engine speed stabilizes within the normal idle speed range. Adjust the air-fuel ratio screw, according to the recommended value on the owner's manual, Chunxiao adjusts the screw with the appropriate tools to achieve the best fuel efficiency.

Adjust the main valve screws to test whether the vehicle's acceleration and top rev are normal, and then gradually adjust to achieve optimal performance. Note: Carburetor adjustment should be done while the engine is at normal operating temperature.

At the same time, some high-end models may use an electronically controlled fuel injection system that does not require early carburetor adjustment. Thank you for your trust, the above is my reply, I hope it can help you, I wish you a happy life and all the best

1. Check the adjusting device of the fuel distributor to ensure that it can work normally. 2. Inspect, clean or replace the metal filter of the fuel distributor to ensure that it is working properly. 3. Check the fuel film spring to make it reach the design position to ensure that it correctly adjusts the fuel mixing ratio.

4. Check the connector of the fuel distributor to ensure that there is no leakage between it and the oil pipe. 5. Make sure that there are no pistons and other external objects in the fuel pipeline, and ensure that the fuel flows to each injector of the engine. 6. Check the fuel line and replace the aging flexible rubber pipe to ensure the correct operation of the distributor.

7. Check the end face of the fuel pump so that the effective fuel enters the fuel distributor. 8. Check the piston of the fuel distributor to make sure it has enough fuel at the end. 9. Check the fuel filter to make sure that the filter paper is clean and that it is working effectively.

10. Check the oil pressure sensor, and adjust the fuel distributor according to the inspection results to make it work normally

The best way to adjust the carburetor: 1. First check the tightness of the connection with the carburetor to ensure that the carburetor suction is normal and there is no air leakage or suction blockage, and rotate the carburetor mixing ratio screw clockwise to the end, and then rotate the circle counterclockwise; 2. Start the engine, let the engine warm up for 10 minutes, so that the engine reaches the normal working temperature, adjust the idle adjustment screw of the carburetor, so that the engine speed is the lowest and can be kept without stalling; 3. Repeatedly adjust the carburetor mixing ratio screws left and right to make the engine speed reach the highest. In this process, some friends will send the mixing ratio screw to a certain position, and then rotate the mixing ratio screw in the counterclockwise direction, the idle speed will not change, at this time, the mixing ratio screw can stay in the position when the idle speed is just adjusted to the maximum; 4. Repeat the step operation repeatedly, so that the engine idles smoothly, rotate the throttle handle rapidly, refuel violently, and then release the throttle, in this process, observe whether the engine acceleration and deceleration are stable, if it is stable, the adjustment is successful, if it is not stable, repeat the operation of 4 to 6 steps until the engine acceleration and deceleration are stable; 5. When the engine is idling, it should be kept for 5 minutes without stalling, after the idle speed is adjusted, some vehicles may idle very low, at this time the idle speed should be slightly higher, keep it at about 1000-1500 rpm, because the idle speed is too low, and the engine may stall when the accelerator is idle when the accelerator is idle at high speed, because the air pressure of the air inlet is reduced at high speed, which affects the gasoline of the carburetor idle measuring hole.