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00:00:00
In this video, we will consider the structure and principle of operation of a carburetor,00:00:04
constant vacuum. Let's start with the part where air is sucked into the carburetor. This is the part00:00:09
that, in the direction of travel, in diameter, goes to a narrowing - is called the "confuser". But most often,00:00:15
by mistake, this part is called - "diffuser". The idle00:00:20
air jet is located here . Air jet of the main fuel system. Air00:00:25
channel starting concentrator. A wide channel serves for air intake and00:00:30
atmospheric pressure transfer to the membrane chamber. Accelerator pump nozzle.00:00:35
Solenoid valve starting enrichment. Fuel supply to the float chamber.00:00:42
Fitting communicating the float chamber with the atmosphere. Adjusting screw, amount of fuel mixture,00:00:48
idling. By default, the screw is unscrewed from the stop by 2.5 turns.00:00:54
There is a spring under the screw . Metal washer. Rubber sealing ring. Throttle valve.00:01:06
The same idle channel, which is regulated by a screw.00:01:11
Three unregulated mixture supply channels, for transients, when the throttle is opened.00:01:18
Mixture supply channel, for enrichment, at cold start. Channel controlling the00:01:25
air shut-off valve. A traverse on which the throttle stop adjusting screw is located.00:01:34
The lever that drives the accelerator pump. The torque is transmitted from the throttle sector. Also,00:01:41
on this side, there is an air cut-off valve. It is called the idle control valve00:01:46
. It serves to enrich the idle mixture, in cases of abrupt closing of the throttle,00:01:52
at high crankshaft speeds. Membrane spring. Sealing ring. Membrane.00:02:03
Valve seat. Plastic valve. valve spring. Air inlet. Exit.00:02:10
Under the top cover is a membrane chamber. It contains: a spring,00:02:20
a piston with a membrane, which is also called a spool. Dosing fuel needle.00:02:27
rubber ring. Lock washer. At the bottom of the piston, in addition to the hole for the needle,00:02:34
there is another hole for controlling the piston. Atomizer of the main dosing system.00:02:39
Fuel enters the float chamber through this channel. When the fuel level reaches a predetermined level, the00:02:51
float closes the channel with a needle. This assembly may experience one of the following problems:00:03:01
Debris caught under the needle can cause fuel to overflow. Also,00:03:06
if the scooter has not been used for a long time, the needle may turn sour in the open or closed position.00:03:12
The spring-loaded pin of the needle may also turn sour. In good condition,00:03:16
after pressing the pin, it should return to its original position.00:03:20
Fuel jet idling. Main fuel jet. The feeding00:03:37
tube of the launcher is enriching. accelerator channel. Rubber gasket.00:03:49
Accelerator pump. Pump power channel. Channel for supplying fuel to the accelerator injector.00:04:01
Jet. Spring with a ball - play a check valve troll.00:04:09
return spring. Membrane stem. Sealing ring.00:04:17
Fuel chamber of the enricher.00:04:19
A jet through which the fuel chamber is filled.00:04:25
The feed tube of the enricher has an opening on the side for de-airing the fuel00:04:36
chamber. Inside the tube has a truncated hole for fuel dosing. The enricher supplies00:04:46
the engine with an additional air-fuel mixture during the stages of starting and warming up a cold engine.00:04:51
When the engine is still cold, the locking element, in the form of a piston with a needle at the end, is00:04:56
drawn into the body of the solenoid valve. Thus, the fuel channel and the channel for supplying the finished00:05:01
mixture are open. During engine start-up and operation, a negative00:05:07
pressure builds up in the enrichment chamber. Atmospheric pressure acts on the fuel in the float chamber, which forces00:05:13
the fuel to move into the low pressure zone, that is, the enrichment chamber. First, the fuel00:05:18
fills the fuel chamber of the enricher. To the very top. Along the way, displacing excess air00:05:23
through the side hole in the tube. Next, the fuel enters the enrichment valve chamber.00:05:29
Air from the air filter also enters here , through the corresponding air channel. Fuel00:05:34
mixing with air forms a mixture and is drawn through the supply channel to the00:05:38
carburetor outlet. Immediately after starting the engine, the heating element of the solenoid valve begins00:05:44
to receive power. As the thermoelement warms up, the shut-off needle of the electrovalve moves forward.00:05:50
As a result, the needle blocks the fuel supply to the enrichment chamber, and the piston blocks the supply channel,00:05:56
which is also the exit from this chamber. To avoid idle air being drawn in through the air00:06:01
duct. A leaky solenoid valve seal is often the cause00:06:07
of poor cold starts. If the valve is stuck in the open position, the engine will run at00:06:14
high idle. Fuel consumption is possible. If the needle gets stuck in the closed one, it may be00:06:20
difficult to start the engine on a cold one. At idle, that is, when the throttle is00:06:29
closed, the engine is fed with an air-fuel mixture through the idle channel. The00:06:35
channel begins - with an idle air jet. Further, an additional air channel adjoins the channel.00:06:41
It originates in the membrane chamber. And passes through the air shut-off valve. Most00:06:47
of the time, this valve is open. Further, the air from these two channels is directed to the00:06:52
emulsion tube, the idle jet. Here, under the influence of atmospheric pressure,00:06:57
fuel from the float chamber rises through the idle jet. Here, the fuel is mixed00:07:02
with air and the mixture is sent to the exhaust channels. A group of three outlets,00:07:08
located under the plug, when viewed from below. From above, these channels exit under the throttle00:07:14
. They are used in transients, during the opening of the throttle. And partially,00:07:19
in idle mode, if the throttle valve is significantly ajar with the stop00:07:23
screw. Another outlet is located behind the throttle valve, at the outlet of the carburetor.00:07:29
It is several times larger than the previous three. From this channel, the engine is powered in idle mode00:07:34
. The throughput of this channel is changed by adjusting the mixture quantity screw.00:07:40
Let's go back to the air shut-off valve. If, while the engine is running at high speeds,00:07:48
the throttle is closed abruptly, the working mixture is combined. This in turn causes00:07:53
misfiring. Unburned fuel is thrown into the exhaust, and after its accumulation00:07:58
, a backache in the muffler may occur. You can avoid such a development of events by enriching the mixture00:08:04
immediately after a sharp closing of the throttle. That's what the air shut-off valve is for.00:08:09
In the normal state, the spring presses on the membrane. The diaphragm stem is pressed against the shut-off valve, keeping it00:08:14
open. The air from the intake, passing through the chamber of the main membrane, freely passes00:08:20
through the valve - into the idle channel. Supplementing air from the air jet. With a sharp closing of the00:08:27
throttle, under the condition of high revolutions of the crankshaft. The maximum vacuum00:08:32
is created in the exhaust tract . Through the control channel, which also passes through the cover. This00:08:37
vacuum extends to the shut-off valve diaphragm. Atmospheric pressure bends the membrane,00:08:42
overpowering the spring. The valve closes the air channel. Thus, air enters the idle channel00:08:48
only through the air jet. Which thereby increases the amount of gasoline in the mixture,00:08:53
for idling. When the engine speed decreases and the vacuum decreases, the00:08:58
spring returns the diaphragm to its original position, thereby opening the shut-00:09:03
off valve. Possible malfunction of this valve is damage to the membranes. When it00:09:08
breaks, it is possible to make it difficult to start the engine on a cold and unstable idling.00:09:12
When the throttle valve is opened, the vacuum area begins to00:09:18
spread in the opposite direction, to the intake air flow. All the same atmospheric00:09:24
pressure, in the float chamber, through the main jet, raises the fuel to a zone of lower00:09:29
pressure, which is now in the emulsion tube and above it. From the side of the air jet,00:09:34
the main dosing system, air enters the emulsion tube. Mixing with fuel,00:09:40
the mixture is drawn past the dosing needle. through the sprayer, into the working area or as00:09:45
it is also called the mixing area. And then, together with the air, they are sent to the engine inlet. As00:09:50
the crankshaft spins up, the vacuum increases. The residual pressure inside the piston00:09:56
and membrane, which was equal to atmospheric pressure, is released through special calibrated00:10:01
holes. The higher the engine speed, the faster this happens. As the pressure00:10:06
inside the piston and membrane decreases, atmospheric pressure entering the membrane chamber begins to press00:10:12
on the membrane. By overpowering the spring in the piston, the piston rises along with the needle, thereby increasing the00:10:19
throughput of the atomizer, giving more mixture and air to the engine intake. Actually00:10:26
, this system was invented in order for the air-fuel mixture to arrive in the right00:10:30
amount for the current engine speed. Regardless of the degree of throttle opening. After00:10:36
closing the throttle, atmospheric pressure fills the piston cavity, thereby00:10:41
equalizing the pressure on the membrane - both from the inside and from the outside. The piston returns to00:10:46
its original position. The main malfunction of this node is a membrane breakthrough. A symptom00:10:52
of such a malfunction is an inadequate response to the throttle. The engine RPMs are below00:10:57
average. If you open the throttle too quickly. In this case, the load on the engine will be00:11:03
significant. This can cause the mixture to come together abruptly. To eliminate such moments,00:11:08
an accelerator pump is provided on the carburetor, which, when the throttle is opened sharply,00:11:13
injects an additional portion of fuel directly into the mixing chamber.00:11:16
Fuel from the float chamber, through this hole, fills the cavity under the00:11:26
diaphragm pump. With a sharp opening of the gas handle, there is pressure on the pump rod. The pressure00:11:32
from the membrane is transferred to the fuel. Because the inlet is smaller than the outlet.00:11:37
Pressurized fuel flows through the pump outlet. Moving towards the non-return valve,00:11:43
overpowering the valve spring, lifting the check ball. At this time, part of the fuel that00:11:49
is already in the enrichment injector channel is injected into the mixing chamber.00:11:58
Part of the new fuel fills the booster injector.00:12:04
After equalization, the line valve closes, eliminating the possibility of fuel reverse flow.00:12:10
When the throttle valve closes and the lever does not press on the pump rod, the spring returns00:12:15
the diaphragm to its original position. The fuel from the float chamber is refilled under00:12:20
the pump diaphragm. If the throttle opening is not sharp enough and the fuel pressure will be00:12:26
negligible. The fuel will simply return back to the float chamber through the inlet port.00:12:30
A common malfunction is the extension of the lever that transmits torque to the pump rod.00:12:41
In such cases, it is enough to bend the lever again so that it can put pressure on the accelerator.00:12:52
Due to the fact that the nutrient hole of the accelerator pump is in00:12:55
one of the lowest positions. Sometimes, this leads to the accumulation of water, under the pump membrane.00:13:01
This leads to corrosion of the pump cavity itself and the spring. Therefore, while cleaning the carburetor,00:13:06
it is worth looking under the pump membrane. By the way, the accelerator pump spring and the00:13:11
air shut-off valve spring are a bit similar. unknowingly, they can be easily confused. Therefore, it should be remembered00:13:16
that the accelerator pump spring is softer than the air cut-off valve spring.00:13:20
The throttle valve is not intended to be disassembled for service. Therefore, the screws00:13:30
of its fastening are flared (flared) and in order to avoid unauthorized twisting.00:13:34
Under the metal cap is a stopper and a washer.00:13:50
From the side of the sector, on the damper axis, there is a caprolon sleeve, a rubber cuff.Description:
В видео показана работа элементов карбюратора и возможные неисправности. ✅Купить новый карбюратор для вашего скутера: https://sgo.one/ux3xIg 00:00 Вход в карбюратор 00:36 Описание левой стороны 01:00 Выход с карбюратора 01:26 Описание правой стороны 02:13 Верхняя крышка 02:44 Нижняя часть 03:46 Крышка поплавковой камеры 04:29 Пусковой обогатитель 06:24 Холостой ход 07:43 Клапан отсечки воздуха 09:14 Основная топливная система 10:58 Ускорительный насос 13:26 Дроссельная заслонка
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