Which carburetor is better to install on Izh Planet-3. I have a K-68D motorcycle that behaves strangely. The idle is almost impossible to adjust. The fuel adjustment bolt is fully tightened, the throttle adjustment is unscrewed, but the motorcycle still holds high speeds.
Quite a long time ago I decided to install 4 K68 carburetors on my “six”. And all this time I was somewhat saddened by the lack of an accelerator pump on them, and, accordingly, by the failure when the throttle was sharply opened.
When searching on the Internet, only one implemented solution was found - an accelerator pump from a Zhiguli carburetor with a rather complex drive system.
I didn’t want to make such a system at all, so another, very simple solution was found
— to enrich the mixture when the gas suddenly opens, you need to increase the pressure in the float chamber at this moment. On the K-68 this turned out to be very easy to do - you just need to connect the space above the throttle valve with the float chamber. The cylindrical throttle moves tightly in the throttle well and will act as a piston forcing air into the float chamber. And so that when lowering the throttle, a vacuum is not created in the float chamber, you need to add a valve to this entire system that will let air into the space above the throttle when it is lowered.
Such a system is suitable for any carburetor with a cylindrical throttle, for example, a Java Jikov or a moped carburetor.
Now let's talk about how to do this in practice:
In order not to make unnecessary holes, we will blow into the float chamber through the ventilation channel of the float chamber.
The resistance of all channels should be minimal in order to ensure the most rapid increase in pressure in the float chamber, so we pull the fitting out of the channel and drill out the channel to 5mm.
We replace the old fitting with a new one, with a diameter of about the same 5mm.
To make a new fitting, you can take a tube of a suitable diameter from a telescopic antenna. I didn’t have an antenna, so I took a tube from the choke drive rod of the Zhiguli carburetor.
We cut the same fitting into the throttle well cover. The thread on the cap is single start, so every time you screw the cap on it will turn back to where you originally made it.
If the carburetors are new, it is possible that when the cap is screwed on, the sealing ring will be squeezed out. In advance, before cutting into the fitting,
we cut the cap, because the trimmed cap will twist to a different angle, and the fitting will not be where it is needed.
It should not stick out inside the lid, because... This is where the throttle comes out when fully opened, so before gluing it you need to trim it, something like in the photo:
I glued both fittings with thick epoxy glue, something like “cold welding”.
What kind of carburetor is used on the Izh Planet-5 motorcycle
The latest Planet model was produced in several variations. Early transitional models were equipped with K-62I carburetors. Then they began to install the K-65I and the more progressive K-68I with a cylindrical throttle valve.
All three carburetors: top left - K62I, top right - K68I, bottom - K65I
All three carburetors have a similar operating principle. From the tank, through the fuel valve, fuel enters the float chamber. The floats are made of petrol-resistant lightweight material. As soon as gasoline fills the chamber, the floats will float up and the shut-off needle will block the fuel supply channel.
From the chamber, fuel enters the atomizer through the main fuel jet. In it, the fuel is mixed with air entering through a special hole in the atomizer body. The finished mixture enters the mixing chamber (diffuser) and then into the engine cylinder. This dosing system is called the main one. And it only works at medium and high engine speeds, when the throttle is raised more than 2/3 of its stroke.
To operate the engine at low speeds, the carburetor is equipped with an idle system. It consists of a fuel tube, mixture quantity and quality screws, a special air channel, transition and idle holes in the diffuser.
The fuel rises through the tube due to the vacuum in the mixing chamber and is mixed with air entering through the air channel. As a result, the resulting mixture, when the throttle is opened slightly, exits through the idle hole (it is specially located behind the throttle valve, at the end of the diffuser).
If you continue to raise the throttle, the vacuum will increase in the area of the transition hole and the mixture will also begin to flow through it. In general, when you lift the throttle (turn the throttle lever), the mixture becomes leaner and the engine speed increases. The air flow speed increases and, by lowering the pressure in the mixing chamber, the fuel supply increases.
The carburetor of the Izh Planeta-5 motorcycle also contains an engine starting and warming up system (to facilitate engine starting in the cold season). The enrichment corrector is installed on the carburetor body or brought to the motorcycle handlebar using a cable. When it is lifted, 3 channels will open in the carburetor body. Through the fuel channel from the float chamber, the fuel will enter a special cavity, where it will mix with air coming from the air channel (this channel is usually located at the end of the diffuser on the air filter side).
As a result, the finished mixture will flow through a special channel to the outlet of the mixing chamber (behind the throttle valve). The channels are designed in such a way that the finished quality of the mixture is sufficient to warm up the engine.
Float stopper or additional starting device. When you press it, the floats lower and additional fuel enters the chamber. When starting, the mixture is richer and the engine starts easier. It is recommended to use the drowner only at temperatures of +5 C and below.
How to adjust carburetor on Jawa 638
The motorcycle is equipped with Izhevsk carburetors K-62D, K-65D, K-68D, or the Czechoslovak 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). Many people have a question about carburetor adjustment. In this video I tried to explain in an accessible and “on-the-finger” way...
I PUT A JIKOV CARBURETOR ON IZH JUPITER 4!
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. But this is just part of the adjustment; each time you need to set the carburetor idle speed. In this video I installed a Jikov carburetor, and the motorcycle started going faster! Well, see how I installed it in...
Carburetor "Ikov" Java, design review and overhaul.
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. As was said, this screw provides air in all positions of the damper, and therefore at idle speed of the crankshaft. Playlist carburetors. .
Adjusting the float chamber Java 638
After fixing the carburetor to the engine, a cable is attached to the shaped hole of the throttle and the cover is tightened. The throttle is checked for the ability to fully open the diffuser and not jam in all positions of the throttle stick. Adjusting the fuel level.
IZH Jupiter on LK Owl and IKOV carburetor
Before installing the carburetor on IZ Jupiter 5, make sure it is completely clean and all parts are present. First, remove the carburetor cover with the three-hole throttle body. The new carburetor on the IZH Jupiter 5 has a limiter located in the cover, which is removed after the break-in period.
adjusting the float chamber ikov jawa
At the same time, we agree that the candles used are those recommended by the manufacturer! A light brown or dark gray color should be considered normal: it indicates that the candle is not overheating, but at the same time it is heated quite strongly and this ensures its self-cleaning from fuel and oil combustion products. When the position of the needle is selected, it will be possible to talk about the greatest efficiency of the carburetor: to achieve it, the needle must be lowered one notch.
Carburetor Jikov
At the bottom of the carburetor, a cover is attached with two bolts, which is the body of the float chamber. The float chamber plays a critical role in engine operation; with the help of float 6 and needle 7, it automatically regulates the fuel supply to the carburetor to a certain level, which in turn affects engine operation. Level in the carburetor float chamber.
CARBURETTOR from JAVA on IZH. I'M SHOCKED…
Install the assembled carburetor onto the engine through a standard gasket and secure with nuts, tightening them evenly to avoid deformation of the flange.
Improvement of the IKOV carburetor for sharpness, for IZ Jupiter
CE 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. guys, this is just an experiment, if you don’t mind the carb)
Adjusting the K-68 carburetor on the IZH Planet-5 motorcycle
The K-68I carburetor was installed on the Izh Planet-5 motorcycle more often than others. With proper setup and proper care, the motorcycle starts quickly, runs smoothly and without complaints.
To adjust the K-68I carburetor you will need a flat-head screwdriver, pliers, and a ruler. For clarity and ease of adjustment, use the K-68 carburetor diagram.
Algorithm for adjusting the Izh Planeta-5 carburetor:
- The first step is to check the fuel level in the float chamber. Unscrew the camera cover bolts with a screwdriver and remove it. Turn the carburetor over and use a ruler to measure the distance from the carburetor body to the top edge of the floats. It should be 26 ± 5 mm. If the parameters deviate, the tongue of the floats is bent in the appropriate direction using pliers. At the same time, in no case should the parallelism of the floats be disrupted.
- Set a gap of 2 mm between the throttle valve and the bottom of the mixing chamber by adjusting screw 11. Then check the position of the throttle needle. The required needle position is the middle groove. The remaining grooves are made to move the needle lock and adjust the appropriate fuel quality depending on climatic conditions.
- After all the above steps, we proceed to the most important stage - setting the idle speed. The idle quality adjusting screw 15 (located vertically on the left side of the carburetor) is screwed in until it stops, and then unscrewed 1-1.5 turns. Start the engine and warm up for 5 minutes. Using the mixture quantity adjustment screw 11 (located horizontally on the left side of the carburetor), we set the minimum stable engine speed. At the same time, slowly unscrew screw 15 until the engine speed stops increasing. It is the moment of reducing the crankshaft speed that will be optimal for determining the position of the adjusting screw 15. We again reduce the engine speed with screw 11 and unscrewing screw 15, we find a new optimal position of the throttle valve. This operation must be repeated until the minimum, but at the same time stable, engine crankshaft speed is established.
- By sharply turning the throttle lever at idle, we check the correctness of the adjustment (the quality of the mixture). If, when the throttle is opened sharply, the engine stalls or picks up speed poorly, screw 15 needs to be tightened a little, thereby enriching the mixture. If the engine stalls when the throttle is closed, screw 15 should be unscrewed slightly.
- You can also check the correctness of the adjustment by the color of the central insulator of the spark plug. After adjusting the carburetor, drive a motorcycle for a distance of 5-10 km and remove the spark plugs from the cylinder head. Dark carbon deposits indicate that the mixture is too rich. A light color (whitish or sandy) indicates that the mixture is poor. The normal recommended candle color is brown or brick.
- It is also worth remembering that the free play of the throttle cable is 1-3 mm. If it is not there, the throttle adjustment will be incorrect. The free play is set by adjusting a special bolt located under cap 18.
The video below clearly shows the adjustment of the K-68I carburetor on the Izh Planet-5 motorcycle.
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 :
- Set low but fairly stable engine speeds by rotating the screw that adjusts the throttle position.
- By changing the position of the idle screw, set the engine to maximum speed.
- Repeat these steps 4-5 times, gradually reducing engine speed.
- 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.
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Carburetor repair
When using the motorcycle for a long time, you may encounter carburetor overflow (leakage from the drain hole). First of all, it is recommended to check the fuel level in the carburetor and the tight fit of the shut-off needle. By bending the locking needle brackets in the desired direction, we adjust the fuel level (the distance from the plane of the middle of the floats to the edge of the carburetor body is 13±1.5 mm). The tapered end of the locking needle is made of rubber. If it becomes leaky, it is recommended to replace it with a new needle from the repair kit. It also happens that the floats begin to leak gasoline due to fatigue of the material. It can also be treated by replacement.
Floats
Fuel nozzles become clogged due to low-quality fuel or when dirt gets in from the air through the filter. To clean gasoline, in addition to the mesh in the fuel tap, you need to additionally cut the fuel filter into the gas hose. The air filter must be tightly connected to the carburetor. At the same time, you cannot change its design, much less install a so-called zero.
The filter element must strictly comply with the throughput recommended by the motorcycle manufacturer. Never use needles or wire to clean the jets. It is enough to wash them in gasoline and blow them with compressed air.
Carburetor K-62 disassembled.
Sometimes it happens that when starting or running a motorcycle, the carburetor sneezes. This happens due to problems in the ignition system. The first step is to replace the spark plug. If this does not help, then the ignition has failed. Usually the carburetor shoots during early ignition. Sneezing can also be caused by a mixture that is too lean. The combustion process of such a mixture is slow and when the piston opens the inlet window, the mixture shoots into the diffuser.
The main reason for a lean mixture is air leaks in the following places:
- from under the crankshaft oil seals;
- cylinder heads;
- at the junction of the carburetor flange and the cylinder pipe.
We try to find and eliminate the cause of air leaks using the elimination method. You should start with inspecting and adjusting the ignition system.
Which carburetor is better to put on Planet 5 instead of the original one?
If desired, imported Japanese Mikuni carburetors with diffuser diameters of 30 and 32 mm can be installed on Izh Planet-5 motorcycles. Naturally, you need to select jets recommended by the manufacturer. On Planet-5, the throughput of the main fuel jet corresponds to 270 ml/min, the corrector fuel jet is 255 ml/min.
You will also need to select an adapter to connect the carburetor flange to the cylinder. You can order an adapter from a turner or select one from other motorcycle models. The inlet window of the diffuser on Mikuni is wide, so the rubber pipe for connecting to the air filter will also need to be selected.
It is important to remember that all connections must be tight, without distortions.
The diameters of the diffuser and the cylinder inlet must be the same and have no steps that prevent the mixture from entering the combustion chamber.
This is what the installed Mikuni carburetor looks like on the Izh Planet-5 motorcycle.
All of the above also applies to the installation of a Chinese PZ 30 carburetor on the Izh Planet-5 motorcycle. Its special feature is the presence of a version with an accelerator pump, which helps enrich the mixture at high engine speeds. But to use it, you need an additional cable that will work in tandem with the motorcycle’s gas handle.
With minor modifications, the carburetor flange fits well with the mountings to the cylinder pipe. An important point is that you need to install a rubber or textolite gasket between the pipe and the flange so that the carburetor does not heat up when the engine is running.
This is what the installed PZ30 carburetor looks like on the Izh Planet-5 motorcycle.
Imported carburetors are good because they do not have the usual suction. To start the motorcycle, you do not need to fill the crankcase with gasoline; you just need to open the enrichment corrector. These carburetors also have regular drain holes instead of a drain hole, which are fitted with hoses that can be taken out to any convenient place. For example, under a motorcycle engine, so that if the carburetor overflows, nothing will get dirty.
Carburetor of Izh Planeta 3.4 motorcycles
Izh Planet-3 motorcycles were equipped with K-62P and K-36I carburetors. The latter had a unique design for its time. The throttle shape was U-shaped, which made it possible to significantly reduce the dimensions of the carburetor (in comparison with the K-28 and K-37 produced at that time). The corrector was moved out of the diffuser area and regulated not the air, but the fuel. This solution made it possible to reduce fuel consumption by 4-6% due to more stable mixture adjustment.
The mixing chamber cover was fastened with special locking springs, which made it possible to quickly and conveniently replace the throttle cable or rearrange the needle. The main fuel jet was screwed into the bottom of the carburetor next to the drain plug. To clean it, it was not necessary to dismantle the carburetor. The diameter of the diffuser of the K-36I carburetor at the outlet is 28 mm, and in the middle it is 26 mm. That is, the mixing chamber is a kind of aerodynamic profile, which has a beneficial effect on mixture formation.
Another feature of the K-36 carburetor is its operating principle, which is similar to a car carburetor. The screw for the amount of mixture in it regulates not the air, but the fuel emulsion entering behind the throttle. Due to this, the sensitivity of the carburetor settings at idle has increased. Adjustment is carried out with screw 1 for the quantity of the mixture (at an angle) and screw 2 for the quality.
The K-36 carburetor has one drawback. It is sensitive to road dust. The upper latches do not seal the lid of the mixing chamber tightly and dust particles get there, the valve begins to jam and wear out. That is why motorcycles on which such carburetors were installed (Kovrovets, Izh Planeta-3, etc.) were equipped with carburetor protective covers.
Later, new K-62 carburetors with the indices I, P, B began to be installed on the Izh Planet-3, 3-01 and 4 motorcycles. The power of two-stroke engines grew and there was a need to increase the diameter of the diffuser (now it was 32 mm), throughput jets, etc.
The new carburetor design made it possible to uninterruptedly supply the engine during sudden braking and acceleration, tilting and rolling of the motorcycle.
Setting up such a carburetor is carried out similarly to the K-68 setting described above. The quantity screw is not located on the side of the carburetor, but in the upper part.
How to install a carburetor
Before installing the carburetor
on IZ Jupiter 5, make sure it is completely clean and all parts are present.
First, remove the carburetor cover with the three-hole throttle body. The round hole located in the center is intended for placing and fixing the needle, the shaped one, located on the side of the cutout, is for attaching the cable coming from the throttle handle, the T-shaped one is for installing the screw rod. The new carburetor on the IZH Jupiter 5 has a limiter located in the cover, which is removed after the break-in period.
After fixing the carburetor to the engine, a cable is attached to the shaped hole of the throttle and the cover is tightened. The throttle is checked for the ability to fully open the diffuser and not jam in all positions of the throttle stick.
Next, the fuel line is connected to the fitting. The joints are checked for the slightest leak, after which the starting device is opened.
Apply a few light presses on the claw, then start the engine normally. After checking the functionality of the device and the uniformity of fuel distribution on a warm engine, the ignition can be turned off.
Carburetor of Izh Planet Sport motorcycle
Motorcycle Izh Planet Sport 350. A legend of the Soviet motorcycle industry. Early models of the motorcycle were equipped with Japanese components, in particular a Mikuni carburetor with a diffuser diameter of 32 mm. Thanks to him, the motorcycle's power was 32 hp. at 6700 rpm.
The reliability of the carburetor is explained by the simplicity of the design. The throttle has a cylindrical shape. To drain excess fuel, there is a special plug at the bottom of the float chamber. The carburetor is adjusted using an air screw and an idle screw (similar to the K-68). To make starting the engine easier in cold weather, there is an enrichment lever.
Later versions of the motorcycle began to be equipped with the domestic K-62M carburetor. The engine power with it dropped to 28 hp.
As you can see, different carburetors were installed on Izh motorcycles of the Planet line, but mostly domestic ones. As engine power increased, the characteristics of carburetors also changed. For high-quality and long-term engine operation, it is necessary to inspect and clean the carburetor in a timely manner (every 3000-4000 km). If desired, imported carburetors can be installed on Izh Planet motorcycles. The main thing is to choose the right jets with the required throughput and match the diameter of the diffuser.
