Carburetor characteristics for 68 - adjustment and tuning

Carburetor characteristics for 68

Owners of motorcycles that were produced in Soviet times often use the K-68 Pekar carburetor. This equipment is produced in the city of St. Petersburg. Basically, such products were installed on various domestic vehicles.

The series called “Baker” contained a large number of diverse devices. Carburetors of this type were most often found in cars, as well as in motorcycles. For several years now, the demand for these products has not decreased. This happens because equipment of this type has high functional characteristics. These mechanisms are also quite economical.

The K-68 type carburetor is in great demand among car owners. This happens due to a number of reasons. For example, with proper adjustment of this carburetor, gasoline consumption can be reduced by up to 20 percent. In this case, the performance characteristics of the motor will increase significantly. The carburetor from this series also has acceptable performance properties. This mechanism has another significant advantage - its price. It is these characteristics that make this carburetor competitive with others.

MY MOTORCYCLE

The carburetor is one of the main components of a motorcycle, which affects the operation of your bike’s engine. Its correct adjustment affects how it starts, runs, and engine power. The second element is the ignition system. In this article we will talk about adjustments that can be found on motorcycles Minsk, IZH Jupiter and Planet, Voskhod.

The K62 carburetor has two adjusting screws, with which you can change the idle speed, and a needle, by changing the position of which, you can change the property of the mixture (enrich or lean it). When we raise the needle, we enrich the mixture; when we lower it, we make it leaner. Adjusting the quality of the mixture is carried out by walking 2-3 km (at a speed of about 60-70 km/h) and looking at the spark plug. If the candle is covered with the working mixture (the candle is oily, dark brown or black), we lower the needle; if it is too dry (the color is white, light straw), we raise it. As a result, a light brown soot should appear. But this is just part of the adjustment; each time you need to set the carburetor idle speed. So we continue to adjust further:

To adjust the idle speed on the K62 carburetor there is a “quality screw”. This screw supplies air even when the throttle is closed. We repeat, the propeller produces air, although some people think that this propeller is designed for fuel. Therefore, by tightening the quality screw, we close the air flow, that is, we enrich the mixture. If we unscrew the screw, the mixture becomes leaner. As was said, this screw provides air in all positions of the damper, and therefore at idle speed of the crankshaft. Therefore, the quality screw belongs to the idle air regulator. At this moment, it significantly affects the operation, but if the gas is at medium or high speeds, then the influence is not large, but it is present. So, it all comes down to the fact that the idle speed is adjusted, and this automatically affects all engine frequencies. Now, after a short introduction, let’s talk about the idle speed adjustment itself. To keep things simple, let’s talk about adjusting K62 K carburetors and similar ones for Minsk and Voskhod motorcycles. But by analogy, the adjustment of all types of carburetors is the same, so it will also work on IZH and other motorcycles.

Remember that carburetor adjustment always takes place on a warm engine. When the warm-up is done, we begin the adjustment. First, tighten the quality screw to the maximum and unscrew it halfway - one turn. Next, we start the motorcycle and lower the throttle completely with the upper idle screw, then, by unscrewing it, we achieve the minimum stable speed. Next, by unscrewing the quality screw little by little, we achieve maximum speed; when, after further unscrewing, the speed drops, we screw it back to the same maximum and stability. It turned out that we set a stable idle speed at these minimum speeds. But the idle speed is most likely too high, so we lower the throttle with the upper screw, achieving even lower speeds. We tighten it down to the very minimum, when at even lower crankshaft speeds the motorcycle begins to stall. Having established the minimum at which the motorcycle still works, we repeat the procedure again with the quality screw. By screwing in and unscrewing the screw we achieve stability. Then we lower the damper again, making a higher minimum of crankshaft revolutions and so on until the crankshaft begins to operate at the lowest frequencies. When we have completed the adjustment, we can check the idle for stability. To do this, take and sharply turn the throttle to maximum and look at the speed at which the revolutions increase. After increasing, we sharply lower the gas and listen to the engine again. If the idle speed adjustment is done correctly, then with such a sharp increase and decrease in gases, the motorcycle engine should listen to the throttle at the moment and also sharply increase and decrease the crankshaft frequencies. When the engine lags, it means the adjustment is slightly incorrect. In such cases, you can try to do everything all over again, but you can simply add or reduce air at idle. If, with a sharp increase in gas, the engine does not respond immediately or even stalls, it means that the screw should be tightened 1/4-1/2 of a turn. In case of poor performance in cases of sudden release of gas, the screw must be unscrewed 1/4-1/2 turn.

In principle, the adjustment can be completed here. As you can see, there is no particular difficulty here. The main thing is to do everything right.

Mostly motorcyclists suffer with carburetors due to complete misadjustment of the motorcycle. You should first carefully check the ignition and spark plug (it is advisable to install a new one). If the motorcycle is old, then worn out rings will affect performance and make it difficult to install the correct idle. If the whole point is in the development of engine parts, here you need to listen and adjust, since the specified rules will fit, but not completely.

Carburetor settings

K-68 carburetor diagram: 1. Thrust bolt of the cable sheath. 2. Mixture quality adjustment screw. 3. Throttle lift screw.

The K-68 carburetor model is quite often installed on motorcycles of domestic origin. Owners of this type of transport try to get only original spare parts produced at a plant in St. Petersburg.

The performance of the engine in various modes will depend on how the carburetor operates. Everyone knows that the fuel mixture must be prepared in certain proportions between air and gasoline. If this proportion is not calculated correctly, then there will be a disruption in other transport mechanisms. Therefore, control of the mixture creation must be carefully carried out by the driver.

To properly create fuel, you need to properly adjust specific devices. For example, a fuel dosing system. In addition to this, you should look at the operation of the starting device, as well as at the device that monitors the fuel level. Do not forget about adjusting the idle speed yourself.

How to Adjust the Carburetor on Izh Planet 5

How to install and adjust the carburetor on Izh Jupiter 5

Jupiter 5 is one of the more successful creations of Russian motorcycle production. Now, like 30 years ago, the device is often found on the streets of both remote outbacks and large cities, and the owner almost always prefers to service it without the help of others.

The carburetor , being one of the important components of any motor vehicle, is subject to intense use and excessive wear. Taking into account the great age of some models, replacing this module very often becomes an inevitable condition for extending the life of the unit.

The bike is equipped with Izhevsk carburetors K-62D, K-65D, K-68D , or the Czechoslovakian model Jikov-2928SE . There are few differences between the first two options: the design of the top cover; enrichment jet diameter; needle fastening (K-65D comes with a nozzle). The K-68D differs from its predecessor:

• Enlarged diffuser.
• A round (not square, like the K-65) damper.
• Lateral (more convenient for optimization) location of the idle screw
  .
• Threaded (for quick needle adjustment) top cover.

Which carburetor on IZ Jupiter 5? As you can see, the 68th model is more convenient to maintain , however, experienced motorcyclists note that it often contains defects, for example, in the form of the absence of a hole that improves the formation of the fuel mixture.

Jikov-2928CE is considered a higher quality carburetor, but also more difficult to operate and repair. Therefore, when choosing this option, you should prepare for possible difficulties, for example, when searching for replacement jets, because their size is much smaller than those from Izhevsk.

Similar news

Rice. Carburetor K-62:

1 - idle

, 2 — main fuel jet;
3 — float chamber, 4 — sprayer; 5 — float axis, 6 — float lever bushing; 7 — air channel, 8 — nozzle, 9 — dosing needle, 10 — body; 11 — throttle, 12 — needle lock; 13 — throttle spring; 14 — throttle lift limiter (removed after engine break-in); 15 — throttle control cable, 16 — rod with idle speed adjustment screw (lowering the throttle); 17 - cover; idle speed adjustment screw , 19 — fuel inlet fitting, 20 — adapter hole, 21 — idle speed emulsion channel ; 22 — drainage hole, 23 — idle air channel ,
24 — locking needle with washer, 25 — float, 26 — corrector emulsion channel; 27 — dosing needle; 28 — float stopper, 29 — plunger, 30 — plunger spring, 31 — corrector control cable

Float chamber and its settings

Checking the fuel level in the float section is the first step when tuning the K-68 carburetor. To do this you need to choose the right tools. Thanks to them, you can pull out the carburetor and then remove the cover that covered the float chamber. After these steps, you need to position the carburetor so that the floats are at the top.

There should be a distance of approximately 26 millimeters from the top edge of the float to the edge of the body, but a deviation in different directions of up to 0.5 millimeters is possible. If the values ​​are not similar, then the position of the floats should be corrected. This can be achieved by bending the tongue.

The floats must be parallel to each other. If this is not the case, then you can bend them with a bracket.

Engine starting and heating system

In search of an answer to the question of how to adjust the K 65 carburetor, you should familiarize yourself with the engine starting and heating device.

On carburetors K 65S and K 65V, a starting device with an autonomous drive is installed, on K 65G and K 65Zh - with a cable drive (found in motorcycles "Dnepr", "Ural"), and for K 65I, K 65D - a corrector-heater (often used in IZH brand mopeds).

A starter with an autonomous drive includes a plunger, a trigger, a needle, a protective cap, channels, a control rod, a fuel well and holes. The normal position of the device is considered closed.

The cable-driven starter is very similar to the previous version, with the exception of the presence of a rod. The position of the plunger is adjusted by a cable.

The corrector-enricher is characterized by a functioning system in which fuel enters the starting device from the float chamber. Fuel consumption is limited by the jet. The Soviet K 65 carburetor often has such a device. IZH can serve as an example of such motorcycles.

Candles

When adjusting the carburetor of the K-68 model, do not forget about the spark plugs. It is necessary to conduct a detailed analysis of the appearance of the candles. This is done in the following way: the car travels approximately 30 kilometers at high or medium speeds. After completing this route, it is necessary to study the candles in detail. If the car's fuel contains a small amount of air, the spark plugs will become covered with soot. This mixture will be called rich.

If the insulator is white, this indicates that the mixture is quite lean. During normal operation of the car, the spark plugs should have a red-orange or sand color. If they have exactly this color, then the carburetor does not need adjustment.

Based on the results obtained, the car owner needs to decide what to do with the car next. Some situations require only minor adjustments, while others require detailed carburetor cleaning. To clean the mechanism, you need to completely remove it, disassemble it, and then rinse it thoroughly.

Advantages and disadvantages of carburetors

Only the deaf have never heard of the horrors of constant carburetor repair. But what really? What are the advantages of this device and is there any point in dealing with it at all? Strange as it may sound in our technological age, the carburetor has several serious advantages.

1. Simplicity of design. No, the point is not that this is a very simple mechanism. But compared to the electronic components of today's cars, the carburetor is much easier to repair, maintain, and even operate. Most carburetors do not have any electronics, only mechanical devices, which means that a person with “straight hands” can repair and maintain it himself. The “old guard” – our parents, who are accustomed to delving into their “beloved” Zhiguli and Cossacks – remember this well.
2. Maintainability. Anything that breaks in the carburetor can be repaired without “excess blood.” The necessary spare parts can be purchased (there are manufacturers that still produce repair kits. Why not?).
3. When working with low-quality fuel, the carburetor turns out to be much more durable and stable than the injector. In general, it is not too demanding on cleanliness, and if it gets clogged, it can be easily cleaned at home (“garage”).
4. A small amount of water entering the carburetor will not harm it, unlike the injector. However, over time it will require cleaning and calibration.
5. And finally, the carburetor does not require connection to the electrical network, sensors, processor and other “joys” of civilization. It operates solely on the energy of the air sucked in by the engine, which means it was the best option for installation on older cars that had no electronics at all.

But there are also disadvantages due to which carburetor cars eventually disappeared from the world automotive arena.

1. Technology required a fuel supply system with flexible adjustments, rather than with constant parameters, in order to minimize fuel consumption (which no one had previously taken into account). Therefore, the carburetor was replaced by an injection system, which is still being developed and improved.
2. The second significant disadvantage is the dependence of the carburetor on weather conditions. During the cold season, condensation collects inside, interfering with operation; in winter, there is a risk of icing of the inside. At the same time, the summer heat also prevents it from working stably due to active evaporation - disruptions in the supply of the mixture begin.
3. Well, the third drawback is that the environmental performance is significantly lower compared to an injector. In the modern struggle for the environment, carburetor cars simply do not stand up to criticism, since their harmful emissions are much higher.

Stop valve

When checking the K-68 carburetor, you should pay attention to the shut-off valve. This valve has another name - a needle. It is he who can get a rich mixture due to the fact that the valve is not tightly attached.

The needle-type valve contains a rubber ring in its assembly. During the inspection, you can pay attention to the condition of this element. To do this, you need to remove the cover, which is located at the bottom. It is secured with two bolts. When removing these elements, you need to ensure that the gasket is not damaged.

After this, you need to remove the float. To achieve this, you need to squeeze the float rod out of the grooves. During this process, you need to watch the needle, as it can easily fall. Notice how the needle moves along the saddle. If the movement occurs without failures, then everything is normal. If the ring is worn out, it is necessary to replace this element.

Adjusting the K62 carburetor: 17 comments

Hello! Please tell me, I have a Minsk 125, it’s a Pakko (original, new), it’s not in use, it works fine, that is, the idle is normal, it picks up speed briskly, but as soon as you start to move out of place, it doesn’t pull well, or it may even stall, you just need gas open more than halfway. The quality screw is screwed in completely, but if you unscrew it by 1-1.5 rpm, you won’t be able to move it at all - the engine will stall. The spark is normal, the ignition is set correctly, the needle is in the middle position. Please tell me what’s wrong, this is the first time I’ve encountered such a problem?

Did you use the carburetor before or did you just install a new one?

I have an Izh P3 Minsk ignition that runs on a choke and doesn’t hold idle, and when you move from place to place, it’s like a splash, you add half the gas, then it goes, what’s wrong?

started a long time ago? CARBURETOR K 62? HOW DID YOU WORK BEFORE?

Idling

The carburetor on some motorcycles is adjusted at idle. Initially, you need to warm up the engine well, and then set a specific speed when idling. This is done by turning the horizontal screw using a screwdriver.

After this, the quality screw is adjusted. This action requires a screwdriver of the correct size. When adjusting the vertical screw, you need to catch the moment when the number of revolutions reaches its highest level. This must be done until stable engine operation at idle is established.

By closing and opening the throttle you can check the correct setting. If the setting is carried out incorrectly, then when the speed is suddenly increased, the engine will stall. This can be corrected by tightening the screw, that is, enriching the mixture. The engine may stall due to a rich mixture when the throttle is quickly closed. To prevent this from happening, you need to turn the screw out a little.

Carburetor adjustment Izh Jupiter 5

Adjusting the IZ Jupiter 5 carburetor is the simplest, but at the same time the most important process. Whether it is K-62, K-65 or K-68, you must first warm up the engine to operating temperature, and then perform a sequential series of actions :

1. Set low but fairly stable engine speeds by rotating the screw that adjusts the throttle position.
2. By changing the position of the idle screw, set the engine to maximum speed.
3. Repeat these steps 4-5 times, gradually reducing engine speed.
4. Check with sharp jerks that the adjustment is correct.

The carburetor on the IZ Jupiter 5 should be adjusted so that there are no jerks and the engine does not stall in the event of sudden opening and closing of the throttle. In the first case, you should enrich the fuel mixture by turning the idle speed screw ¼-½ turn clockwise. In the second, turn the screw in the opposite direction.

You can also adjust the carburetor on IZ Jupiter 5 in operating modes. Depending on weather conditions and the technical condition of the engine, the metering needle can be moved up to enrich the mixture and down to obtain the opposite effect.

Dosing system

When adjusting the K-68 carburetor, do not forget to adjust the position of the metering needle. To do this, you need to cover some distance on a motorcycle. If the throttle is weak enough, then you need to raise the needle one notch. And if after riding a motorcycle the candles turn out to be burnt, then the needle should be lowered.

This setting will help stabilize engine operation at medium speeds. If driving at maximum speed is necessary, then the carburetor should be adjusted by correctly selecting the cross-section of the jet. When the throttle is cranked to the maximum, it works.

If you know the specific principles of tuning the carburetor of the K-68 model, then the motorcycle owner can carry out the tuning without any help. Fuel consumption, as well as the operation of the main mechanisms of the vehicle, will depend on how the carburetor is configured.

Carburetor adjustment Izh Jupiter 5

Adjusting the IZ Jupiter 5 carburetor is the simplest, but at the same time the most important process. Whether it is K-62, K-65 or K-68, you must first warm up the engine to operating temperature, and then perform a sequential series of actions :

1. Set low but fairly stable engine speeds by rotating the screw that adjusts the throttle position.
2. By changing the position of the idle screw, set the engine to maximum speed.
3. Repeat these steps 4-5 times, gradually reducing engine speed.
4. Check with sharp jerks that the adjustment is correct.

Adjust the carburetor

on IZH Jupiter 5 it should be done so that there are no jerks and the engine does not stall in the event of sudden opening and closing of the throttle.
In the first case, you should enrich the fuel mixture by turning the idle speed ¼-½ turn clockwise.
In the second, turn the screw in the opposite direction. You can also adjust the carburetor Depending on weather conditions and the technical condition of the engine, the metering needle can be moved up to enrich the mixture and down to obtain the opposite effect.

Similar news

Recent Entries

Replacing Bearings on a VAZ 2110 Generator

Replacing a generator bearing on a VAZ-2110, 2111, 2112 The main generator malfunctions include wear of the brushes, rotor commutator, failure

Replacing the Radiator of the Kalina Stove with Air Conditioning

What is the category of license for a snowmobile?

How to Clean the Radiator of the VAZ 2106 Heater

Categories

Test Drive

Kia Niro EV debuts at Busan Auto Show in Korea

Get your free dealer pricing information by filling out your contact information! Long-distance EV competition heats up as Kia announces

Design

The K-65 carburetor of the Ural, IZH, Minsk, etc. motorcycles is characterized by a certain design. The system maintains a constant level of fuel in the combustion chamber. The fuel mixture reaches the fuel valve through the fitting. The shut-off valve has an elastic washer. The valve is connected to plastic floats. They are connected to each other. The floats can rotate.

When the fuel level rises, the excess will be drained through the drain hole. When heated, pressure may increase. To reset its excess, the design provides an unbalancing channel.

The metering device includes a sprayer, a fuel nozzle, a throttle needle, and an air channel. The first of these components is secured with a washer. It is located under the fuel supply pipe. This hose is one of the main components of the idle air system. It also includes an air channel, fuel mixture adjustment screws, and a transition hole.

Throttle needle

When studying the technology of how to adjust the K-65 carburetor, you need to pay attention to the shut-off valve. This is the throttle needle. If it does not cover the channel hermetically, the level of gasoline in the fuel mixture may be higher than the required level.

The throttle needle has several channels on its surface. The latch moves along them. In this case, it is possible to adjust the composition of the fuel mixture within small limits. The gasoline consumption of motor vehicles depends on this indicator. If you need to add more air to the mixture, you need to lower the needle. And vice versa.

When dismantling the float chamber, it is necessary to monitor the position of the throttle needle. If you move it carelessly, it may fall out. There is no way to lose this structural element. Therefore, the procedure is carried out very carefully. If the rubber elements of the throttle system are worn out, they must be replaced. The needle should move easily along the saddle.