The “Tourist” and “Tulitsa” scooters use horizontal carburetors K-28, K-36, K-62. When choosing a model for better engine performance, 2 parameters are taken into account: the diameter of the diffuser (25-27mm) and the throughput of the main jet (180-210cm3/min). The optimal carburetors are with the index “G”.
The K-28G carburetor with a horizontal mixing chamber housing was installed on motor scooters. The carburetor throttle valve moves horizontally. This is the main difference between the K-28G carburetor and the K-28B carburetor, but they work the same way. The K-28 carburetor is adjusted as follows: start and warm up the engine. Set the fuel adjuster lever to the “you” position. By unscrewing or screwing in the throttle valve thrust screw, set the minimum possible engine speed. Tighten the fuel mixture screw as far as it will go, and gradually unscrewing it until the engine runs smoothly and steadily. Repeat the last two operations until the engine stops responding to changes in the position of the fuel mixture screw or stalls. Turn the fuel mixture screw 1/3 of a turn and tighten with the locknut.
GUYS, help! what kind of carburetor?
lol I was looking for info on the carb, I found this post, I have one on IZh49, I just washed it, polished the insides (and a little bit on the outside)
Is there an instruction manual for setting up Keihin PWK carbs?
and better than their Chinese copies?
Or who can tell the algorithm in words what is there and how to turn it?
depending on what Chinese copy it is. ???? maybe nicker won't work out. ????
There is a copy of Keihin OKO, it is qualitatively stolen.
yes it's in the instructions. I installed the jet, tightened the quality, unscrewed it by 2.5, looked at what happened, smoked it further.
cool here?
I want to look at the cheap one, which comes in a blister and has a non-chrome flap. If I don’t see any gaps there like in the old Jacob, I’ll take it.
If there are any gaps or flashes, I’ll think further.. I want to pick up an inexpensive and widespread Chinese carb.
in reality 634.. I want to try the Chinese one. I installed the repair kit on Yakov - it would be better if I didn’t do it. everything is crooked .. new Czech, not Chinese yakov from 5 thousand rubles onwards.
I don’t really want to order from St. Petersburg, I’ll look at the market, it seems like someone had an assortment of carbs there, maybe I’ll find one.
It seems like it’s a copy of a kehin or a copy of a copy, but you can tell them apart.
I'll look at the damper, if I don't see any play like on my old one, I'll buy it.
I’ll throw away the standard air filter along with the box, and I’ll pick up some small zero filter for the carb right there, at the market..
Well, it’s not so simple there.. It’s more difficult to attach another carb to the standard filter than to the engine.
Yes, and the standard box with a filter in reality is somewhat ugly and infuriating.
Is there any tuning manual in Russian? Otherwise, I don’t speak English that way. Of course you should read it.
I once believed that the main characteristic of a carburetor, which determines its performance, is the size of the diffuser. And in general, it is precisely according to this that you need to select a carburetor - you can install it as stock or a little larger. And then, by replacing the GTZ and moving the needle in it, adjust the composition of the mixture at medium and high speeds.
The composition of the mixture at xx is of little interest to me, as long as it doesn’t stall; gasoline consumption at xx and environmental friendliness somehow don’t bother me.
Source
What is this thing for?
What is this thing for? When you pump it up, it sometimes leaks gas, and what happens if you connect it together??
2↑ Reply from Sergey-rus52 11/23/2011 11:18:17
- Registered: 09-02-2011
- Messages: 540
- Reputation: 9
Re: What is this thing for?
they need to be connected together according to the idea
3↑ Reply from Valentin23 11/23/2011 11:21:45
- From: Altai region Slavgorod
- Registered: 24-10-2011
- Messages: 432
- Reputation: 6
- Motorcycle: IMZ 67-36
Re: What is this thing for?
So I’m asking what will change if you connect, the instructions don’t say anything about this
4↑ Reply from jipss 23-11-2011 14:05:13
- From: Gornozavodsk, Perm region.
- Registered: 18-07-2010
- Messages: 2 521
- Reputation: 186
- Motorcycle: Ural 'grom', Ural M72m, cross M-104, forest IMZ with sidecar.
Re: What is this thing for?
Yes, almost nothing, maybe the consumption will change a little, but more or less is different for everyone
5↑ Reply from Shaman 23-11-2011 16:36:12
- From: Teykovo 37 region
- Registered: 13-02-2011
- Messages: 1 346
- Reputation: 86
- Motorcycle: imz 8.103-40, dnepr 11
Re: What is this thing for?
so you can just mute it
6↑ Reply from Messer_SS 23-11-2011 18:23:44
- From: Tambov
- Registered: 05-09-2010
- Messages: 3 821
- Reputation: 328
- Motorcycle: There are many of them.
Re: What is this thing for?
I switched and don't regret it
7↑ Reply from Likan 23-11-2011 20:45:12
- From: Moscow region Naro-Fominsk
- Registered: 22-01-2011
- Messages: 681
- Reputation: 78
- Motorcycle: Ural with sidecar
Re: What is this thing for?
This is the balancing channel of the float chamber with atmosphere. you just need to leave it alone and not attach/connect anything to it.
from the manual: The carburetor is equipped with a balancing system, which consists of many channels connecting the above-fuel space of the float chamber with the atmosphere. The task of this system is to provide constant, close to atmospheric, pressure in the chamber (and therefore at the entrance to the dosing systems). The balancing system is equipped with a fitting, which allows using a hose to drain excess fuel from the carburetor (for example, when using a quencher) into a reserve tank, and not into the ground.
Edited by Likan (23-11-2011 20:47:28)
8↑ Reply from Messer_SS 23-11-2011 20:53:29
- From: Tambov
- Registered: 05-09-2010
- Messages: 3 821
- Reputation: 328
- Motorcycle: There are many of them.
Re: What is this thing for?
This is the balancing channel of the float chamber with atmosphere. you just need to leave it alone and not attach/connect anything to it.
from the manual: The carburetor is equipped with a balancing system, which consists of many channels connecting the above-fuel space of the float chamber with the atmosphere. The task of this system is to provide constant, close to atmospheric, pressure in the chamber (and therefore at the entrance to the dosing systems). The balancing system is equipped with a fitting, which allows using a hose to drain excess fuel from the carburetor (for example, when using a quencher) into a reserve tank, and not into the ground.
You write correctly. But there is one BUT: this is a manual for 68 carburetors on 2-stroke engines in which the carburetors stand vertically and without tilting. Through my trial and error experience, I came to the conclusion that it is necessary to bridge them with each other using a capillary (good for car washers). I installed these carburetors after the killed 301s. They were praised to me for their meager consumption, etc., etc. I filled in about 2 liters and it quickly gobbled up my fuel. I got upset. Then, by chance, in one of the long turns, I noticed that when I leaned to the right side, this right carb fitting It’s just that gasoline is simply pouring out. At the same time, the level in the float chamber was set. In the end, I shorted it and I don’t regret it. But it’s up to you to decide.
Possible malfunctions of motorcycle carburetors
The power and other qualities of motorcycles depend on how the carburetors work.
It is on the correct adjustment of the carburetors that the way the motorcycle will start, its speed and control depends. Many people mistakenly believe that a carburetor is a rather simple device. But it is a rather complex device. It is in it that various mixture formation processes take place. They are difficult to evaluate even in the laboratory. And if the metering systems or any carburetor component is faulty, it can be very difficult to determine the cause. Therefore, the performance of the carburetor is assessed by indirect signs. They evaluate the quality of the combustible mixture that is prepared in the carburetor. You can recognize this, but with experience. And at first, before adjusting the carburetors, the ignition system and the correctness of its installation are checked.
The combustible mixture can change its composition in order for the combustion process to be normal. This depends on many factors - time of year, engine operating mode and other factors. But for a specific case, its composition must be certain. And the smallest errors lead to increased fuel consumption, and the engine will not work well enough.
The resulting mixture of different composition equally slows down acceleration, reduces speed, and overheats the engine. How is the quality of the resulting mixture determined? To do this, you need to drive along the road and prepare the plate in advance. Moving at low speed, cover one-fourth the size of the inlet pipe with this plate. And watch the speed of your motorcycle change.
Possible options:
- Rich. With this composition, the speed of the motorcycle will decrease quite noticeably, and the engine speed will also decrease.
- Enriched. These figures will not decrease much.
- Depleted. Speed increases slightly.
- Poor thing. This mixture will significantly increase the speed.
In what case is the composition of the mixture disrupted? When little air is supplied, or, on the contrary, a lot of fuel, the mixture turns out rich. This means that the carburetor adjustment was made incorrectly or the air filter is clogged. This mixture burns at a lower speed. Without having time to completely burn out in the cylinder, it burns out in the exhaust system. Hence the appearance of soot. And it, in the form of tarry deposits, can reduce engine power, and the cylinder overheats. As a result, excessive fuel consumption.
If a large amount of air enters the combustible mixture, but, on the contrary, there is less fuel, it turns out to be lean. There can be many reasons for this. The parts of the carburetor are not tightly connected, so foreign air enters. Fuel jets may become clogged, there may be several reasons. Such a mixture burns out at an even lower rate than a rich mixture. The result of using a lean mixture is increased fuel consumption, engine overheating, and a decrease in its power. Popping noises in the carburetor.
How to determine in which system a particular mixture is prepared? If you hear popping noises while driving downhill or when accelerating, it means the idle system is faulty. If popping noises occur when the engine picks up high speeds, you have a malfunction in the main metering system. You can change worn parts of the carburetor or the carburetor itself.
How to adjust the carburetor on a pit bike
In order to adjust the carburetor on a pit bike. It is necessary to remove the carburetor and filter, completely disassemble it, wash it with gasoline, and blow it with a compressor. Also rinse the filter thoroughly and dry it and apply special oil. After the manipulations are completed, we put everything in place. We test the pit bike on a flat, deserted area. The engine will need to be turned off so that the throttle position is at full. And then we unscrew the spark plug and carry out the above manipulations. We figured out how to adjust the carburetor on a pit bike. But I would like to describe in more detail about changing the jet. In order to determine whether we generally need to change the jet or not. It is necessary to unscrew the gas handle a quarter turn. This is necessary to check that the carburetor is set correctly. And then we check by sharply turning the throttle. If your pit bike does not stall, then you did everything right.
Having determined the need to change the jet, we select the correct size. Everything is simple here, for a mixture that has a dark color (rich mixture) we select a larger nozzle size. For a pale mixture (poor), select a smaller jet size.
As a result of everything, I want to highlight the three stages of setting up the carburetor on a pit bike.
Source
How to install and adjust the carburetor on Izh Jupiter 5
Jupiter 5 is one of the most successful creations of Soviet motorcycle production. Today, like 30 years ago, the device is often found on the streets of both remote outbacks and large cities, and, in most cases, the owner prefers to handle its maintenance independently.
The carburetor, being one of the most important components of any motor vehicle, is subject to intensive use and increased wear. Considering the great age of some models, replacing this module very often becomes an inevitable condition for extending the life of the unit.
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). 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 is better to install 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.
