K-68 carburetor adjustment. Motorcycle carburetors

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

The carburetor is one of the most important systems on a motorcycle. The performance characteristics of the vehicle itself, as well as the durability of its functioning, depend on the correctness of its operation. Therefore, when choosing this element of the system, drivers pay attention to the device and the principles of its configuration.

If the motorcycle has a K-68 carburetor, it is not difficult to perform the adjustment procedure on your own. In this case, the engine will start quickly, and the speed will become stable. In this case, the engine will begin to receive a mixture of gasoline and air in the correct proportion.

General characteristics

Carburetor K-68 "Pekar" is in great demand among owners of domestic motorcycles. The presented equipment is produced by the plant in St. Petersburg LLC "Fuel Systems". Production was focused on domestic machine-building enterprises. The main consumers of their products were VAZ, PAZ, Gazelle, Volga, etc.

The Pekar series of carburetors includes devices for cars and motorcycles. This equipmentnew generation. The differences lie in the design and functional characteristics of the presented carburetors. Also among motorists they are known for their efficiency. Therefore, the demand for the presented devices has not decreased for many years.

Proper adjustment of the K-68 carburetor can reduce gasoline consumption by up to 20%. This significantly improves the performance of the motor. The carburetor of the presented series, according to the reviews of experts and consumers, has good performance. Affordable cost makes the presented products competitive. Therefore, K-68 carburetors are in great demand today.

Types of setting

When choosing a carburetor for Ural, Dnepr, IZH and other brands of domestic motorcycle manufacturers, most users prefer the K-68 model. Moreover, buyers are trying to purchase exactly the original equipment manufactured by the above-mentioned plant.

The correct operation of the engine in various modes depends on the operation of the carburetor. Therefore, when preparing the fuel mixture, it is necessary to maintain a certain proportion of air and gasoline. Violations in this system cause failures in other systems and mechanisms. Therefore, the driver must control the ratio in the mixture of fuel and air.

In order for the process to proceed correctly, it is necessary to ensure the correct adjustment of various devices. These primarily include the main dosing system. Also requires attention during maintenancedevice and mechanism for maintaining a certain level of fuel. The driver also performs idle adjustment.

Fuel level

Setting up the K-68 carburetor can begin with checking the fuel level in the float section. To perform this procedure, you need to prepare the necessary tool. With it, you need to dismantle the carburetor. Next, the cover is removed, which closes the float chamber.

The carburetor needs to be turned over. The floats will now be on top. The owner of the motorcycle must measure the distance from the top of the floats to the edge of the body. Ideally, it will be 26 mm. A deviation of 0.5 mm in both directions is allowed. If the indicator does not correspond to the standard, it is necessary to correct the position of the floats. To do this, the tongue needs to be bent a little.

The floats should also be parallel. If this is not the case, they are folded in with a bracket.

Inspection of candles

Adjusting the K-68 carburetor also involves evaluating the appearance of the candles. To do this, you must drive at least 30 km on the highway. In this case, the turnover should be medium or high. After that, you can start studying candles. If carbon deposits form on them, this indicates an insufficient amount of air in the fuel. It's a rich blend.

It happens that the insulator is completely white. This is indicative of a lean fuel mixture. Normal candle color ranges from red-orange to sandy. If so, then the single-chamber carburetor should not be tuned.need.

Based on the results of observations, the driver decides on further actions. Sometimes you only need to make adjustments, but sometimes you may need to clean the carburetor. In this case, the device is completely dismantled, disassembled and washed.

Shutoff valve

Checking the K-68 carburetor requires attention to the shut-off valve. It is also called a needle. If the valve is leaking, the level of gasoline in the mixture may rise. This creates a rich mixture.

The needle valve of the K-68 carburetor may have a rubber cone or ring in its design. To check the condition of this element, you need to remove the cover at the bottom. It is attached to the body with two bolts. When removing fasteners, care must be taken that they do not damage the gasket.

Next, the float is removed. To do this, you need to carefully squeeze its rod out of the grooves. The needle may fall out. Therefore, it is necessary to monitor it so as not to accidentally lose such an important element. If the rubber ring or cone is worn, it is necessary to replace them. The needle should also move smoothly across the saddle.

Fuel level adjustment at Ural

Adjustment of the carburetor of the motorcycle "Ural" with certain skills can be done without removing the block itself. Due to the nature of the installation, some difficulties may arise with dismantling. The carburetor in this motorcycle is located on the cylinder heads at an angle to both the horizontal and vertical planes.

To make the adjustment, you will need a float from the same device. The motorcycle must be secured to the stand. Next, the gas valve opens. You need to wait a while. The carburetors will fill with fuel. Then the fuel valve is closed. The hose is disconnected from the carburetor.

The bottom cover filled with gasoline must be removed. A spare float is lowered into it. The lid must be leaned against the body so that their planes become, as it were, a continuation of each other. The fuel level should be under the rim of the bottom corner of the cap. If this is not observed, you need to bend the tongue.

Idle adjustment

Adjustment of the carburetor of the motorcycle "Ural", "Dnepr" and other vehicles is first performed at idle. To do this, the engine must be warmed up. Next, at idle, you need to set a stable speed. To do this, you need to rotate the horizontal screw, which is turned with a screwdriver.

Next, the quality screw is adjusted. This will also require a screwdriver of the appropriate size. You need to find a vertical screw. When setting it, it is necessary to catch the moment of increasing the number of revolutions to the maximum level. This action is repeated until stable engine idling is established.

You can check the correct setting by closing and opening the throttle. If you suddenly give gas, if the setting is incorrect, the engine will stall. This means that the screw needs to be tightened (to enrich the mixture). When the damper is suddenly closed, the engine stallsdue to too rich fuel mixture. The screw needs to be turned out a little.

Main dosing system

K-68 carburetor adjustment also requires adjustment of the metering needle and its position. You need to ride a motorcycle for some distance. On a straight section of the track, you need to evaluate how the vehicle responds to the throttle. If it is weak, the needle is raised up one division. If after the trip the candles are sooted, they lower it.

This setting will ensure stable operation of the engine at medium speeds. They are mostly used by drivers. To adjust the carburetor at maximum speed, it is necessary to choose the right section of the jet. Only it works with the throttle handle turned all the way.

Having considered the principles of setting up and maintaining the K-68 carburetor, each owner of a domestic motorcycle will be able to set it up on their own. Fuel consumption, as well as the operation of the main vehicle systems, depend on the correct implementation of this process.