Carburetor Keihin (Japan) for motorcycles: maintenance, adjustment

Repair, adjustment and cleaning of the carburetor is a rather complicated procedure. However, having penetrated into the technology of its carrying out, each owner of a motorcycle or scooter can make all the actions himself. To do this, you need to familiarize yourself with the details of the implementation of this process, as well as allocate sufficient free time.

Keihin японского производства имеет одинаковое устройство во всех моделях. Keihin carburettor of Japanese manufacture has the same device in all models. For other manufacturers, the cleaning and adjustment principle is the same. Therefore, as an example, this carburetor brand fits perfectly. From the correctness and responsible approach to the cleaning and adjustment depends on the work of the motorcycle.

Need of carburetor maintenance

«Квасаки», «Навигатор» или прочие модели двухколесной моторной техники, следует понимать важность проведения периодического обслуживания карбюратора. Having a scooter "Honda", "Kvasaki", "Navigator" or other models of two-wheeled motor vehicles, one should understand the importance of periodic maintenance of the carburetor. From this system depends the power, ease of start, speed and control of the motorcycle.

In order to supply the same quality fuel mixture to the cylinder block, it is necessary to correctly adjust the carburetor operation. Synchronization allows you to adjust the amount of gasoline and air, which, when mixed, come to the engine.

требуется не только отрегулировать, но и прочищать в процессе обслуживания. Experienced drivers know that the carburetor on the scooter is required not only to adjust, but also to clean during maintenance. In gasoline there is a certain amount of additives, impurities. When the motor is running, they settle on the walls of the system, forming contamination of the jets. To ensure the carburettor's ability to perform its functions in full, you need to periodically clean it of dirt and carbon accumulated inside.

When is maintenance required?

Keihin PZ30 , CVK - не суть важно) всех популярных моделей имеет схожий принцип проведения техобслуживания. The carburetor ( Keihin PZ30 , CVK - is not important) of all popular models has a similar principle of maintenance. Therefore, signs of the necessity of carrying out this procedure will in all cases have similar symptoms.

The main reason, which requires the adjustment of the carburettor, is the uneven operation of the motor. It manifests itself at idle. Also, there may appear claps coming from the silencer, an increased consumption of gasoline. The driver should periodically pay attention to the appearance of the candles. Significant changes in their color indicate a violation of the preparation of the fuel mixture.

Candles can be considered the main indicator of carburetor work. If they are white, the mixture is considered poor. Too much candle burn on the candles indicates the preparation of a rich mixture. This is a deviation from the norm. The cause may be a muddy carburetor or a malfunction of its settings. In this case, carry out maintenance as soon as possible. Periodically, you should also clean the system. It depends on the frequency of operation of the motorcycle.

Disassembling the carburetor

Keihin , его потребуется демонтировать. To clean the Keihin carburetor , it needs to be dismantled. To get to it, you need to remove the airbox and gas tank. Then loosen the clamps of the manifolds. Dismantled cable suction (enrichment).

и другие модели подобных транспортных средств имеют систему карбюраторов, которые стоят в одном ряду. Scooter "Honda" and other models of similar vehicles have a system of carburetors that stand in one row. For cleaning they do not need to be separated from each other. However, to replace the seals, you will have to disassemble the ruler.

When dismantling, the carburetor block is removed, as well as the gas cables. Now you can easily maintain the system. The top covers must be removed (screws unscrewed). Next, inspect the condition of the gaskets, needles and rubber bands.

The inside and the carburetor itself, as well as the details around it, must be thoroughly cleaned. For this purpose a bath with gasoline and a usual paint brush are suitable.

Disassembly unit

If you want to disassemble the carburetor block, the next step is to dismantle the intermediate plate between them and the air filter. Then you need to unscrew the bolts on the bar that holds the block together. CVK или другой модели обычно требует применить здесь большие физические усилия. Keihin CVK or another model usually requires applying great physical effort here. Most likely, you will need to use a screwdriver with a T-shaped handle.

Then it is necessary to disconnect the return spring. For this, bolts are also unscrewed at the appropriate places. Plank easily slips and disconnects from the structure.

Between the carburettors fix a long bolt. It must also be dismantled. You can disassemble the unit. The first carburetor is removed and the spring is laid aside. They can not be confused with places (differ in size). The body is then cleaned from the outside.

Carburetor unit maintenance

может нуждаться в замене диафрагмы. The carburetor on the scooter may need to replace the diaphragm. In some cases it is also necessary to completely replace one of the elements of the block. The internal metal surface of the device can oxidize over time. Therefore, you need to replace the diaphragm. It is very carefully extracted with a screwdriver.

This element can be obtained with a dosing needle and a flap. Then, if necessary, the old components can be replaced.

After this, unscrew the screws of the float chamber. Its cover is removed. Evaluate the work of the float can be with a light click on it. If this element springs, then its work is correct. No substitutions are required. When disassembling it is very important to use a screwdriver of the appropriate size. All work must be done very carefully.

Cleaning

Keihin после демонтажа требует тщательной очистки. Carburetor Keihin after dismantling requires thorough cleaning. To do this, you need to purchase a special tool. It should not destroy rubber seals. Many such purifiers are on sale. Convenient if the product is in the bottle. With a special tube it will be easy to spray it around the whole mechanism.

Work should be conducted outdoors. The composition of solvents includes many dangerous components. Therefore, in an enclosed space, it is highly discouraged to do such work.

Under pressure, the carburetor is purged with air. If necessary, some areas can be cleaned manually with cotton swabs. If the length of the springs is significantly different (by 1.5 mm), they must be replaced.

Assembling the carburetor

в прежнее положение. After the correct cleaning and replacement of all obsolete parts, the carburettor is installed in its previous position. Reassemble in reverse order. When installing the diaphragms, the return spring must be correctly installed in the seat. If it is easy to install it in place it did not work out, the part must be simply turned.

When installing the damper, it is necessary to follow the position of the needle. It should not move aside. If necessary, the parts must be greased with a grease.

Then, in the reverse order, the cylinder block is assembled. To do this, you will need to prepare the appropriate tool. All carburettors have differences. Therefore, when disassembling it is necessary to number them. требует щепетильного отношения. Installing the carburetor requires a scrupulous attitude. All bolts, springs, must be collected very carefully. It is better to record the sequence during disassembly, so as not to lose any element of the construction.

Synchronization

Keihin . After cleaning, the Keihin carburetor setting is required. You can start with synchronization. This is a simple procedure. But it will require a synchronizer. This device checks for sparseness.

Motorcycle must be warmed up to the working temperature of the motor. Then the tank and the filter are removed. Synchronizer will help to establish the same rarefaction in the reservoir. The device is connected to it. The engine starts.

According to the sensors, the valves need to be adjusted. They should react (but not violently) to changes in sparsity. If the synchronizer needle does not accept changes, the valve must be released. The process is carried out using the appropriate screws on the carburetor. First, adjust the right and left screws. Only then can the central lever be adjusted.

Idling adjustment

After qualitative cleaning, the idling speed is adjusted. To do this, the motor must be heated well. To do this, you need to start a vehicle and wait 10-15 minutes.

Next, refer to the manufacturer's instructions. It shows where the adjustment screws are located. Guided by this knowledge, you can start the process. Screwdriver, through which all settings will be carried out, is better marked. On one side it is necessary to paste a marker. This will allow you to understand how many turns have been made.

At idle, it is necessary to twist the corresponding screw. If it is clamped, the revolutions will increase, and vice versa. The adjustment is carried out until the stable operation of the engine is reached at idle.

Mixing quality control

прошла успешно, можно приступать к настройке качества топливной смеси. If the idle speed adjustment has been successful, you can proceed to adjust the quality of the fuel mixture. It should not be too poor or rich. Adjustment is made with the help of an adjusting screw or by moving the needle in the throttle valve.

Before adjustment, the motor should be warmed up. This procedure is carried out only for a clean carburetor. Most often for normal operation of the system, it is required to unscrew the screw from the extreme position by 1.5-2 turns. But many reasons affect this indicator.

If the screw is turned clockwise, the mixture is enriched, and vice versa. If the needle is lowered, the mixture is impoverished. When both settings are combined, the fuel delivery system to the engine can be accurately operated. If the procedure is performed correctly, the motorcycle will accelerate smoothly. When driving there will be no jerks

Fuel level adjustment

Keihin завершается проверкой топлива в поплавковой камере. Adjustment of the carburetor Keihin is completed by checking the fuel in the float chamber. To do this, prepare a transparent tube. It is located at the bottom of the system. The drain screw must be unscrewed. Further the tube rises upwards, in the opposite side from the carburettor. The fuel level is checked.

The test is carried out with working motorcycle engines. The tube should always be higher than the carburetor. The fuel should be at a level slightly lower than the curb of the lid.

Keihin , а также его устройство и обслуживание, каждый владелец транспортного средства сможет произвести чистку и настройку самостоятельно. After reviewing the Keihin carburetor , as well as its arrangement and maintenance, every vehicle owner will be able to clean and set up himself. This will prolong the period of operation of the vehicle, make the movement on it safe and comfortable. Almost all the actions the driver can make independently, without turning to the car service.