The first production Voskhod motorcycle was equipped with a K-36B type carburetor, which had two metering systems - main and idle, as well as an enrichment device.
To rinse and clean it is necessary to disassemble in the following order: 1 - close the gasoline tap and disconnect the gasoline hose; 2 — unfasten the latches and remove the housing cover along with the cables, spool and fuel corrector; 3 - remove the rubber coupling; 4 — unscrew the two fastening nuts and remove the carburetor; 5 — remove the sealing gaskets; 6 - perform a complete disassembly.
Wash the removed parts with clean gasoline, inspect and reassemble in the reverse order. The factory settings ensure maximum and optimal engine efficiency.
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Adjusting the K-36B carburetor
Adjustment at idle speed is carried out as follows: 1 - before starting the adjustment, you need to start and warm up the engine. 2 — set the fuel corrector coin to the farthest position from you; 3 — by turning out or screwing in screw 14, set the minimum possible engine speed; 4 - tighten screw 13 until it stops, gradually unscrew it, achieve clear, stable operation of the engine; 5 - set screw 14, lower or raise the throttle to the minimum stable idle speed.
The quality of the mixture is adjusted in operating modes by moving the metering needle 6 in the throttle valve to one of the five annular grooves, while raising the metering needle ensures enrichment of the working mixture, lowering ensures depletion.
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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.
K-36B carburetor diagram
1. Fitting. 2. Fuel corrector. 3.Fuel corrector spring. 4. Locking needle. 5. Throttle valve spring. 6. Dosing needle. 7. Mixing chamber housing. 8. Air intake channel. 9. Sprayer. 10. Main jet. 11. Fuel corrector jet. 12. Float. 13. Idle speed adjustment screw. 14. Throttle set screw. 15. Throttle valve. 16. Cover of the mixing chamber housing. 17. Cable guide. 18. Leaf spring. 19. Float release button. 20. Float chamber cover. 21. Float chamber housing.
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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.
Adjusting the K-62V and K65P carburetor
Adjust the idle speed in the following sequence: 1 – screw screw 18 until it stops, which regulates the air supply for idle speed. Then unscrew one turn. 2 – Open the throttle slightly using the throttle. 3 – Start the engine and warm it up. 4 – Using bolt 16, lowering the throttle valve, achieve minimal stable engine operation. 5 – Unscrew screw 18 to set the maximum speed. 6 – Using bolt 16, lower the damper again to minimum speed. 7 – Check the adjustment. Sharply open the throttle with the throttle. If the engine stalls or there is a failure in operation. When switching from idle to main working. The adjustment is incorrect. Screw 18 needs to be used to enrich the fuel mixture - tighten it by a quarter. Or repeat the entire adjustment. 8 – Adjusted correctly, if there is no dip and the motor does not stall. And it continues to gain momentum.
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Carburetors K62, K65
try lowering the needle one notch. floods once.
Attachments
Dmitry Ulkansky
Old timer
- #3
Re: Battle with carburetor
Everything is fine with the ignition. In Hailo Buran, manuil is supposed to splash on a cold one. More aesthetically pleasing into the intake manifold through a fitting. When I had a K65, I adjusted it according to the instructions, there were no problems. There are topics about carburetors, why start a new one. Read the forum, many questions will disappear by themselves. Happy registration! Fill in the terrain in the profile, the operating conditions will be clearer. One more thing - does the valve (needle) hold, the ring has not fallen off? Is the level in the float chamber normal?
WoodCutter
New guy
- #4
Re: Battle with carburetor
The ignition is fine. I went to the needle and looked at the ring.
snowstorm
Veteran
- #5
Re: Battle with carburetor
AlexS
Veteran
- #6
Re: Battle with carburetor
try changing the muffler
snowstorm
Veteran
- #7
Re: Battle with carburetor
WoodCutter
New guy
- #8
Re: Battle with carburetor
Thanks for the advice, I tinkered around and looked at everything and Buran went and changed the spark plugs and wires, pulled the head, checked the seal, took off the pants and the muffler, there wasn’t a lot of shit inside, but he still cleaned it and calcined it with a lamp. I washed the carburetor and lowered the needle, looked at the fuel pump - the membrane was intact. As recommended, I unscrewed the quality by 1.5 turns, it seemed okay, it drives normally, it accelerates easier, it doesn’t fart or sneeze. Tomorrow I’ll go for a ride and check how much it’s eating now, it should be less.
Adjustment with dosing needle
The dosing needle for adjustment has five positions and is fixed with a special lock. Raise the needle one notch and increase the fuel supply. We lower it and reduce the fuel supply.
Under normal conditions, the needle is installed in the central groove.
When operating a motorcycle at high temperatures of plus 35 degrees and above, as well as in rarefied air at an altitude of 2000 and above above sea level. The needle should be released one division.
And vice versa at low temperatures of minus 15 degrees and below. The needle should be raised one notch
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Modifications
Various versions of the K-62 carburetor were used on two-stroke motorcycle engines of the Minsk and Izhevsk motorcycle plants, on boat engines of the Neptune series, and on Tulitsa scooters. Since the operating conditions and engine sizes of these machines are different, each carburetor had different diameters of the diffuser and fuel supply nozzles, which was reflected in the model index:
- K-62 with a 30 mm diffuser was used on the Jupiter 4 IZH.
- K-62B with a 32 mm diffuser was used on the Planet 4 IZH.
- K-62V with a 26 mm diffuser was used on Voskhod 3.
- K-62G with a 26 mm diffuser was used on Tulitsa scooters.
- K-62D with a 28 mm diffuser was used on the Jupiter 3 IZH.
- K-62E with a 30 mm diffuser was used on Serpukhov motorized strollers.
- K-62P with a 32 mm diffuser was used on the Planet 3 IZH.
- K-62L with a 26 mm diffuser was used on the Neptune 23 outboard motor.
- K-62M with a 32 mm diffuser was used on IZh PS.
- K-62S with a 26 mm diffuser was used on the Minsk 3.115 motorcycle.
Adjusting the fuel level
For this purpose, there is a brass adjusting element on the float, as shown by the white arrow in the photo.
The entire adjustment process comes down to setting the float in a certain position. Remove the bottom carburetor cover and turn it upside down with the float.
We look from the side so that the mark on the float from the mold (black arrow shows) is parallel to the carburetor plane (red arrow shows).
In this position of the float, the fuel level will be within 12 ... 14 mm. This level is necessary for normal engine operation.
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Engine
The “heart” of a motorcycle, even with the most careful use, gradually wears out - this is facilitated by the abundance of heterogeneous mechanical loads in the cylinder-piston group and other moving parts, temperature effects on the metal, the chemical composition of the working mixture and exhaust gases.
DIY motorcycle repair Voskhod most often includes the following engine work:
- removing the power unit from the motorcycle frame;
- partial or complete disassembly of the internal combustion engine;
- replacing piston rings;
- restoration of the cylinder mirror;
- repair or replacement of the piston, connecting rod, crankshaft;
- replacement of support bearings, liners, seals;
- lubrication, fastening, adjustment work.
Engine repair, like the repair of other units, must be preceded by a comprehensive diagnosis of its technical condition, which includes an analysis of operational parameters (approximate indicators of developed power and speed, fuel consumption, sound of operation, color and character of the exhaust). If necessary, diagnostics are performed on the bench, and specialized instrumentation is used.
It is important to navigate the structure of a two-stroke internal combustion engine of a motorcycle and understand how each specific type of repair is performed. So, when replacing piston rings, you can do without removing the engine. It is enough to unscrew the stud nuts, remove the cylinder cover and, opening access to the piston, bring the piston to top dead center. Then the worn rings are removed and new ones are installed. The engine is assembled, not forgetting to replace the gasket. This completes the repair.
Much more complicated is the process of replacing the crankshaft bearings and its seals, the need for which, especially if the motorcycle is used incorrectly, arises quite often. You will need to disconnect and remove the internal combustion engine, clean its external surfaces, disassemble the crankcase, allowing access to the crankshaft, and dismantle the latter. It is important to be careful when knocking out old bearings - if they become distorted, they can damage the seat. And, no matter how trivial it may sound, do not forget to remove the retaining rings. Then the new bearings are carefully pressed in, the crankshaft is installed on the left side of the pan and the engine is turned over. A pin is put on the nuts and the assembled module is screwed into the studs. The power unit is assembled in the reverse order. In case of wear of the inner surface (mirror) of the cylinders, they are bored to repair size and ground. This is a complex and highly precise job that must be carried out by experienced professionals and using special equipment. However, preliminary work - removing and disassembling the internal combustion engine - can be done independently. After the repair, you will have to replace the piston with rings with parts from the corresponding repair group.
This is interesting: When and how to change spark plugs?
Scheme of the carburetor K-62V motorcycle Voskhod
1. Idle fuel jet. 2. Main fuel jet. 3. Float chamber. 4. Sprayer. 5. Float axis. 6. Float lever bushing. 7. Air channel. 8. Nozzles. 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. Throttle lift adjusting screw. 17. Cover. 18. Idle speed adjustment screw. 19. Fitting for fuel intake. 20. Transition hole. 21. Idle air channel. 22. Drainage hole. 23. Idle air channel. 24. Locking needle with washer. 25. Float. 26. Float sink.
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Transmission
During transmission repairs, the following work may be required:
- Adjusting the clutch, replacing its disc and bearing;
- Clutch drive repair;
- Replacement of gearbox bearings;
- Repair of switching module parts;
- Restoration or replacement of gearbox gears.
Most of them require high qualifications and are difficult to do at home. The exception is the repair and replacement of drive mechanisms. So, sometimes there is a need to restore the splines for the gearbox foot, replace the clutch cable or its jacket, or adjust the clutch. These works are carried out without disassembling the crankcase.
Repair and operation of the Voskhod motorcycle are closely interconnected due to the age of the model. However, with the proper approach to organizing and carrying out repairs, the motorcycle will remain your faithful friend and assistant for a long time.
Rework and repair
A significant drawback of the Ikov 2829CE carburetor is poor starting of the motorcycle in cold weather due to the imperfect design of the enricher. A difficult start is noted not only by the owners of 638 models, but also by the owners of some Kovrov motorcycles on which such carburetors were installed from the factory . The thing is that fuel is taken to enrich the mixture from a separate channel in the float chamber, to which it is connected by a nozzle.
Also, a ventilation duct located on the side of the carburetor is used to draw air to the enricher. The cross-section of this channel is so large that the vacuum in the enricher is not enough to suck fuel through the nozzle. As a result, it is not the enriched mixture that enters the channel behind the throttle, but gasoline vapor mixed with cold air, which of course does not contribute to successful engine starting.
To eliminate this problem, the carburetor needs to be modified. The side channel can be plugged, for example, with a gas-resistant sealant, thereby “pressing in” the air.
In this case, the vacuum will be sufficient to suck the required amount of fuel from the chamber. You don't have to worry about chamber ventilation, because... On the other side of the carburetor there is the same channel.
- Correct setting of the scooter carburetor
Another alternative solution to this problem is to install a float suppressor, as on old carburetors (more details in the photo).
