Why does a Ural motorcycle sneeze in the air? Motorcycle shoots out muffler

Owners of motorcycles not only made in Russia, but also of foreign cars often face the problem of “shooting” from the muffler. This happens due to improper care of the air-fuel mixture ignition system. The motorcycle shoots the muffler in several cases:

when using low-quality gasoline;
malfunction of the electronics system responsible for fuel supply;
gasoline does not enter the combustion chamber in pure form;

In such cases, you don’t need to wonder why the muffler on a motorcycle shoots. Poor quality gasoline has a very high combustion temperature due to the addition of water, so it does not ignite completely. The remaining drops fall on the walls of the heated muffler . Their ignition creates pops.

The motorcycle also shoots into the muffler when releasing the gas. The lower the pressure created in the internal combustion chamber, the more droplets enter the muffler. On some bikes, fuel accumulates in the muffler, followed by rare but very loud bangs.

Most often, but not always, owners of the Russian motorcycle industry face this problem. For example, a Ural motorcycle shoots into the carburetor. This occurs due to direct clogging of gasoline in the carburetor itself. To avoid this problem, it is necessary to constantly clean the filters and change the consumables responsible for cleaning the engine. Proper operation of your bike will not only ensure good engine performance, but will also maintain factory specifications.

Why does the silencer shoot: reasons

The main reason for the appearance of pops is incomplete combustion of fuel. Once it enters the exhaust system, it ignites. The process is accompanied by a noise similar to cotton. The force of the explosion depends on the amount of unburned fuel. Sometimes you can even hear a whole line of shots. By the way, sometimes it shoots into the muffler when the gas is suddenly released or when you press it - and a lot of smoke comes out of the exhaust pipe. A breakdown is indicated by a loss of internal combustion engine power and an increase in fuel consumption. There are other reasons why popping occurs.

Incorrect thermal clearance

The thermal gap is the distance by which individual parts of the engine increase in volume when heated. In particular, it is between the valve tappets and the camshaft cams. An incorrectly set thermal gap is one of the possible reasons why the muffler shoots.

Indirect evidence of an increase in the thermal gap may be increased noise during engine operation, as well as a decrease in its power. If the gap is reduced, this may cause gases to shoot into the exhaust pipe. This occurs due to the fact that a valve that is not completely closed allows gasoline to enter the manifold, from where it then enters the exhaust system.

The thermal clearance of the cylinder head valves can be adjusted. Therefore, to eliminate this problem, it is enough to adjust the valves. This procedure is always carried out on a cold engine.

The essence of the problem

Most often, loud pops in the muffler of two-wheeled vehicles are heard when a lean mixture is supplied to the engine. The reason for its formation may be the use of low-quality gasoline, saturated with water and non-flammable impurities, or incorrect adjustment of the intake system. The air-fuel mixture burns only partially - its remains splash out into the hot muffler, where they explode with sharp, unpleasant sounds. A symptom of a lean mixture is popping sounds in bursts, which intensify as the speed increases.

What do the shots affect?

Problems with the ignition system do not bode well. In such a situation, with prolonged engine operation, not only the aesthetic impression can deteriorate. A dirty carburetor or low-quality fuel will eventually disrupt cylinder compression, which in turn will lead to engine failure.

To understand why your motorcycle is shooting at the muffler, you should check the problem areas. Here are possible ones:

not tightness of the pipes that can suck in air, or the exhaust tract;
faulty spark plugs;
dirty air filters or carburetor;
difficulty in supplying fuel;

However, the problem may also be with the racers' rev limiter. The spark plugs do not charge continuously, causing most of the mixture to go straight into the exhaust system, where it hits the hot metal and ignites, creating a loud bang.

Messages [20]

1↑ Topic from Alexander97 06/21/2014 18:37:17

Topic: Won't start, shoots into carbs and muffler.

Tell me, maybe I rebuilt the engine, adjusted the valves, set the ignition, cleaned the carburetors, but the engine doesn’t want to start, it shoots and that’s it. Tell me please))

2↑ Reply from drakone 06/21/2014 18:40:51

on drakone
Elder
Inactive
Name: Albert

From: Omsk region. Omsk city
Registered: 07-12-2012
Messages: 4 972
Reputation: 125
Motorcycle: Ural 8.103.10, GAZ 31029

Re: Won't start, shoots into carbs and muffler.

maybe due to a larger gap in the contacts i.e. If the ignition is not set correctly or if the compression is bad, maybe I messed up somewhere, maybe it’s worth checking the spark plugs

Added: 06/21/2014 21:40:51

although I think you couldn’t help but look at them

3↑ Reply from Alexander97 06/21/2014 18:45:27

Re: Won't start, shoots into carbs and muffler.

The spark plugs are new, but for some reason the spark is different, one spark plug is red and the other is blue, I changed the coils but still the same garbage(

4↑ Reply from drakone 06/21/2014 18:52:34

on drakone
Elder
Inactive
Name: Albert

From: Omsk region. Omsk city
Registered: 07-12-2012
Messages: 4 972
Reputation: 125
Motorcycle: Ural 8.103.10, GAZ 31029

Re: Won't start, shoots into carbs and muffler.

Did you swap the spark plugs too? maybe due to different wires, if they are different or poorly screwed. I think this is due to a gap in the contacts

5↑ Reply from Alexander97 06/21/2014 18:58:00

Re: Won't start, shoots into carbs and muffler.

Power system and carburetor

For normal operation, the engine requires a working mixture of gasoline and air in strictly defined doses at certain speeds. If the amount of gasoline in the mixture exceeds the amount of air, then there is simply not enough air to burn the entire volume of fuel, and the unburned gasoline goes straight through the exhaust valve into the exhaust manifold, into the catalyst, into the muffler and burns out where the temperature is higher. This could end, at a minimum, with the resonator torn to shreds and the driver in a pre-infarction state.

Video tutorial about the design and operation of a carburetor

Read also: Is it healthy to sleep on the floor?

IZ Jupiter, conversations about him.

Messages: 1,745 From: row: out:

Pros: cheap. Cons: everything else)

What do you want to describe this mots about? What have you driven so far and how much have you driven? Based on this, it will be easier to talk.

Pros: cheap. Cons: everything else)

This is me comparing with the TDM850. Everything in the world is relative.

What do you want to describe this mots about? What have you driven so far and how much have you driven? Based on this, it will be easier to talk.

Hello, let's write down what you drove and how you drove it if possible

Messages: 3,461 mapetka shinenkay

v mix

, he asked you, actually. To make it easier to build a dialogue.

Everything is clear. I myself have ridden mainly on Jupiters, from yu3 to yu5. I have 6 years of experience racing. Now I'm racing in the Urals with my brother

Post edited by v mix

— Mar 21 2008, 19:21

Messages: 3,461 mapetka shinenkay

v mix

, well, if you drove both Izhas and parasites, then what should I compare Izhas to? Because you can compare Izh and Uralei-Dneperson yourself.

(I’ll tell the pasikret - if ErNi starts listing the equipment he drove away, the list will turn out to be worthy of extreme envy)

Post edited by tailhead

— Mar 21 2008, 19:29

Messages: 1,745 From: row: out:

Yes, I’m wondering, how do others like this technique? The Soviet auto industry rules

Posts: 725 From: Cheboksary 10T&10whls&875cc

I read the Motorcycle Encyclopedia in the evenings (I looked out in store windows for several years.). It becomes a shame for the state. They produced so many cool motorcycles in their time, they even set speed records and won FIM championships. Where is it now? And those factories are still standing. but they release lost scooters. It's a shame. Or maybe we’ll build a conveyor belt in Chebakh?

Source of the article: https://forum.zarulem.ws/?showtopic=267501&st=630

Clogged air filter

Air filters

One of the reasons why muffler pops is an incorrectly formed fuel mixture. To create it, you need gasoline and a certain amount of air. It enters the engine through a system that contains an air filter at the inlet. If it is clogged, it does not allow a sufficient volume of air to pass through it, so the result is a kind of “oxygen starvation” of the engine. As a result, gasoline does not burn completely , and some of it flows into the manifold and then enters the exhaust gas removal system. There the fuel heats up and explodes. Because of this, a kind of pop is produced in the muffler.

Eliminating the cause of this phenomenon is not difficult. It is necessary to check the condition of the air filter and replace it if necessary. This is especially true if you haven’t changed the filter for a long time, but according to the regulations, such a procedure already needs to be done. This is the simplest problem why the muffler shoots. Let's move on.

Popping sounds due to a problem with the ignition system

Popping noises in the muffler at idle or during normal operation can also be heard due to the fact that the ignition system was incorrectly configured. Most often, popping noises at idle, as well as at high speeds, are due to the fact that the ignition is too late. This is explained as follows. The moment the spark appears occurs when the supply valve has already fully opened. Because of this, some of the fuel manages to leak into the manifold, from where it flows into the exhaust system. If the ignition is, for example, too early, then there will still be “shots”, but they will occur in the air filter, and not in the exhaust pipe. In addition, popping noises in the muffler when pressing the gas, if they occur due to late ignition, are also dangerous because the intake valve may burn out over time. For these two reasons, it is necessary to repair such a breakdown very quickly.

Another reason that lies in the ignition system is spark plugs. The spark may be too weak, causing the fuel to not burn completely again. This may happen for the following reasons:

There may be poor contact on high-voltage wires. To exclude this, firstly, you need to check, and, secondly, clean if necessary. In addition, you should check for the absence of such a defect as penetration to ground.
Another reason is a malfunction in the operation of a part such as a distributor. It should be checked anyway.
The spark plugs themselves can fail. If this happens to at least one of them, then this will greatly affect the power of the spark that it produces, and therefore the combustion of fuel.

If the cause of the popping noise in the muffler was precisely the faulty spark plugs, then they need to be replaced, but only with those that have a suitable heat rating. Only in this case will the necessary power be provided to create a spark.

Carburetor and pops

Quite often it happens that popping noises in the exhaust system begin due to the fact that the carburetor was incorrectly configured. Its job is to create the correct fuel-air mixture, which is then supplied to the engine. If it happens that after adjusting it, it saturates the mixture too much with fuel, that is, gasoline, then the same thing as described above will begin to happen. That is, popping noises will begin to occur in the muffler when gas is released from the carburetor system. Naturally, the only correct way out in such a situation would be to reconfigure this element.

The first thing to do in this case is to check the gasoline level in the chamber in which the special float is located

Read also: Does water help you lose weight?

It is important to know here that each carburetor is adjusted individually, and therefore each has its own optimal level. However, there is one general feature: if you remove the cover, the float should be flush with the level of the cover

If this is not the case, then you need to make adjustments. In addition, you should immediately check the integrity of the float itself. If it has any deformations, this can lead to fuel getting inside it, and therefore it indicates the wrong gasoline level.

Another reason for popping noises in the muffler is the system jets. They may also be incorrectly configured or, if they have been in use for a long time, become dirty. In this case, the same thing will happen as happened with a dirty air filter. Jets are the same as air filters, with the only difference being that they are used in a carburetor system to create a mixture, and not in an injection system. Their clogging means that the amount of air entering the chamber decreases, and therefore the mixture becomes oversaturated with gasoline. Quite often, popping noises in the muffler at idle speeds occur after a sharp transition has been made from such speeds to higher speeds. In addition, the cause may be a sharp increase in speed, that is, excessive acceleration. If after any of these actions popping sounds appear, then you need to check the carburetor.

The starter screams, the cord comes out

- May scream if there is a lot of lube on the balls. It is necessary to clean the balls and the places in the ratchet where they are inserted.

The cultivator released several pops and began to “float”

- Most likely, the power system is not coping, or the fuel level in the tank is low, the float axis may be skewed and perhaps there is debris under the needle valve, you need to remove everything and check the air filter, jets.

The material will be updated, we will be waiting for questions, stories about the detection of a particular malfunction and ways to eliminate it. Also see Answers to questions about a particular walk-behind tractor model on its description page.

Is your engine running but emitting white or blue smoke? Learn what can cause white smoke in your engine and how to fix it.

CAREFULLY

! Always read the engine and equipment manual(s) before starting, operating, or servicing the engine or equipment to avoid personal injury or property damage. See your authorized dealer or contact Briggs & Stratton if you are unsure of any procedure or have additional questions. Find all engine hazard warnings

Retarded ignition

Ignition settings if incorrectly configured can easily lead to similar problems. The system should be checked from the ignition timing angle - if it is delayed, then shots through the muffler cannot be avoided. The spark is delayed, causing some fuel to be sent to the manifold. As a result, you can get not only noise effects, but also valve combustion.

But why does it shoot at the muffler if the ignition settings are set correctly? In this case, the problem should be looked for in electrical engineering. Either the spark itself has a weak charge and the ignition of the combustible mass simply does not work, or there are faults in the contacts with the connection of the toggle switch. Problems are eliminated by a complete revision of the ignition system with a possible replacement of the contact group. At the same time, it doesn’t hurt to check the spark plug to see if it matches the engine’s heat rating and whether it’s in working condition in principle.

Popping sounds from cars with HBO

Unfortunately, this problem also affects cars that use liquefied gas as fuel. According to statistics, owners of cars with injection engines and third-generation gas equipment most often encounter it.

Gas pops can be heard both in the intake manifold and in the exhaust system (in particular, in the muffler). There are two main reasons for this:

There is no stable and sufficient gas supply . This occurs due to incorrect settings of the gas reducer or a clogged air filter. For fuel-injected cars, the culprit may be the mass air flow sensor (MAF). “Glitches” in its operation lead to incorrect operation of the electronics. That is, we get a lean or enriched gas mixture, resulting in popping noises.
Incorrect ignition angle . In this case, the situation is similar to that described above. If the ignition is late, the muffler “slams”, if it is early, the intake manifold or filter.

Monitor the status of your HBO and its settings. Don't neglect problems when they arise. Otherwise, you may not only face expensive repairs, but also spontaneous combustion of the car’s power unit.

Conclusion

Popping noises from the exhaust pipe are signs of a non-critical , but rather unpleasant “illness”. In addition to external manifestations, the engine and exhaust system deteriorate, and excessive fuel consumption occurs, which leads to unnecessary waste of money for the car owner. Also, if the problem is ignored for a long time, the valve, exhaust pipe, resonator or muffler may burn out. In general, if such a breakdown occurs the machine can be used , but it is recommended to carry out repair work at the first opportunity. If you cannot or do not want to do them yourself, contact a service station for help.

A motorcycle shoots into the muffler - problem solving

when using low-quality gasoline;
malfunction of the electronics system responsible for fuel supply;
gasoline does not enter the combustion chamber in pure form;

Messages [1 to 20 of 40]

1↑ Topic from Festival 06/02/2011 15:59:38

Festival
passerby
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Name: Sergey

From: Naro-Fominsk
Registered: 01-06-2011
Messages: 5

Subject: Flame from muffler!

Good day everyone! Acquired a hurricane, they call it the Ural, the former “policeman” was even given a hat with a cockade in 1979. Well, okay, here’s the thing: it started with difficulty, but it started with half a turn “practically”, I struggled with the ignition for two days - I overcame it! Only it’s not often that flames fly out from the left side. Question: where is the sore and how to overcome it? THANK YOU everyone in advance.

2↑ Reply from Messer_SS 06/02/2011 16:03:10

Messer_SS
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From: Tambov
Registered: 05-09-2010
Messages: 3 819
Reputation: 328
Motorcycle: There are many of them.

Re: Flame from muffler!

Most likely there is a problem in the carburetor. Gasoline is leaking into the cylinder. Possible late ignition

3↑ Reply from Festival 06/02/2011 16:21:07

Festival
passerby
Inactive
Name: Sergey

From: Naro-Fominsk
Registered: 01-06-2011
Messages: 5

Re: Flame from muffler!

4↑ Reply from Messer_SS 06/02/2011 16:53:56

Messer_SS
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From: Tambov
Registered: 05-09-2010
Messages: 3 819
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Motorcycle: There are many of them.

Re: Flame from muffler!

Should be 5+. What kind of carbs are on it? What is the condition of the cylinder head?

5↑ Reply from Festival 06/02/2011 17:02:28

Festival
passerby
Inactive
Name: Sergey

From: Naro-Fominsk
Registered: 01-06-2011
Messages: 5

Re: Flame from muffler!

Carb K is 65-relative, I didn’t open the head, I won’t lie, but the right one is normal, but the left one is a little la-la-la.

6↑ Reply from Messer_SS 06/02/2011 17:30:34

Messer_SS
Moderator
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From: Tambov
Registered: 05-09-2010
Messages: 3 819
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Motorcycle: There are many of them.

Re: Flame from muffler!

The left cylinder now has more wear. But the point is that it’s either the carb overfilling or late ignition

7↑ Reply from Festival 06/02/2011 17:39:02

Festival
passerby
Inactive
Name: Sergey

From: Naro-Fominsk
Registered: 01-06-2011
Messages: 5

Re: Flame from muffler!

Well, okay, if I turn the ignition to the left, is it later or earlier?

8↑ Reply from Messer_SS 06/02/2011 18:00:55

Messer_SS
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From: Tambov
Registered: 05-09-2010
Messages: 3 819
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Motorcycle: There are many of them.

Re: Flame from muffler!

To the left - this is counterclockwise - this is later. And clockwise is earlier

9↑ Reply from andrei22 02/22/2013 00:46:57

andrei22
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Name: Andrey

Registered: 18-02-2013
Messages: 92
Reputation: 4
Motorcycle: Ural

Problems in an injection engine

Most often, owners of carburetor engines complain about muffler pops, but injection cars are also not free from such operating nuances. Moreover, the reasons are the same as in the case of the carburetor. This could be a faulty spark plug, incorrect timing adjustment, or the same thermal gap. But why does the muffler of a fuel-injected car shoot if all the problems described above are not detected?

The electronics in the control unit may fail. The regulation of the combustible mixture directly depends on it, and the slightest violation can lead not only to shots in the muffler, but also to mechanical breakdowns. Even if during maintenance it was possible to eliminate the malfunction in the control unit, it would be useful to conduct a comprehensive diagnosis of the power filling to detect possible hidden problems.

Timing phase violation

If the engine starts firing at the muffler, this may be the result of a failure of the gas distribution phases. The same situation will arise in the combustion chamber as with an ignition delay: the intake valve will open before the combustion of the fuel. The remaining gasoline will burn out inside the exhaust pipe, which will cause shots.

This can also be caused by stretching the timing belt. The phases themselves do not go astray; if the mechanism uses a belt drive, then most likely the reason is the belt stretching.

Does the muffler pop only when the engine is warm, but not when the engine is cold? The problem definitely lies in the timing belt.

Silencer for walk-behind tractor - manufacturing, shoots, flames, video

When a problem-free walk-behind tractor begins to act up, the owner falls into a kind of stupor and begins to look for the cause of the problems. The appearance of such a situation is doubly annoying when there is a lot of work and there is no time for downtime.

Often, troubles arise with the muffler, which, for certain reasons, begins to make strange sounds or even behave suspiciously. The main thing is not to panic, but to deal with everything with a cool mind. Let's get acquainted with several problems that occur most often.

The walk-behind tractor shoots into the muffler: what to do?

The owner of such useful and multifunctional equipment needs to know that interruptions in the operation of the muffler can occur due to:

thin and low-quality metal;
frequent potholes;
excessive loads;
difficult work;
fastenings of an ill-conceived plan.

Often the cause of popping noises in the muffler are gaps in the process of supplying sparks and spark plugs. To get rid of the problem, you need to unscrew the spark plug, combine its body and mass, turning the crankshaft using the existing starting handle.

At the same time, you should pay attention to whether a spark appears. If even after these manipulations the situation does not change, it is advisable to thoroughly clean the spark plug

Flame from the muffler of a walk-behind tractor and black smoke: looking for the cause and solution

Many experts believe that such problems arise due to incomplete combustion of fuel in the unit. It is possible that a misfire, the use of an overly rich mixture, a drop in power or overheating may be detected.

If, after trying to start work, not only a flame appears, but also black smoke, then we are talking about the use of low-quality oil or seriously contaminated injectors. Naturally, it is advisable to purchase a higher quality lubricant and thoroughly clean the injectors of all excess.

When a muffler, in addition to the indicated points, also produces serious noise, and a person wants to make it quiet, then it is necessary to increase the weight of the parts, because such problems often arise due to the lightness of the components.

You can get acquainted with other problems that arise with silencers Neva, Centaur, Garden Scout, etc., as well as their solutions, thanks to the video below, where a specialist presents everything in an accessible way and gives answers to the most frequently asked questions.

How to make a muffler for a walk-behind tractor with your own hands?

If a factory part has failed and cannot be restored, and there is no money to buy a new one, then the best solution may be a homemade muffler for a low-noise walk-behind tractor.

What will you need for this?

Vise;
Bulgarian;
Drill of impressive power;
Adjustable wrench;
Welding machine.

It should be noted that the flange fastening is considered the most vulnerable and weak point in the structure, therefore it is necessary to use material of increased strength and thickness. As a basis for creating a quiet muffler for a walk-behind tractor, we use the diagram below.

To form the flange mount, it is advisable to take a workpiece 12 mm thick. In order for the flange to fit as tightly as possible, it is necessary to make a part similar to the one located on the exhaust pipe of the engine.

Then it is important to take care of the expansion chamber. We are talking about a thickening with several partitions, which significantly reduce the speed of movement of flows of used gases and noise

It is important not to overdo it with the number of barriers, otherwise the unit will not be able to start the first time.

To make the final part - the exhaust pipe, it is important to take a part of the same size as the exhaust pipe. The pipe must be strong and reliable

To once again make sure that creating a quiet muffler for a walk-behind tractor is real, you should familiarize yourself with videos in which ordinary people demonstrate the results of their efforts and share “recipes” for success.

Reason and solution

The easiest way to get rid of pops on a carburetor motorcycle is to simply move the needle valve to a different position, changing the degree of saturation of the mixture with gasoline. It is better to entrust this operation to a specialist, since not everyone can fine-tune the carburetor. If there is electronic fuel injection, it is impossible to change the gasoline supply parameters yourself - the control unit will have to be flashed at a specialized service station.

It happens that the motorcycle shoots into the muffler and carburetor - this is often found on domestic Urals and imported choppers with a large cylinder capacity. The problem is a clogged air-fuel mixture at the inlet. To eliminate it, it is worth changing the filters and sealing gaskets, and also checking how tightly the pipes fit to the inlet fittings and whether there are any large cracks in them.

Very often, popping noises appear after replacing the muffler with a non-standard one or cutting holes in it to eliminate resistance to escaping exhaust gases. Particularly unpleasant sounds appear when installing a “direct flow”. The reason is the creation of a strong vacuum, which leads to a lean air-fuel mixture. Powerful imported motorcycles often use an exhaust gas afterburning system, which reduces their toxicity - after removing the standard muffler, its operation becomes clearly audible. To eliminate shots after changing the silencer, you must:

Reconfigure the carburetor or reflash the control unit;
Install filters with a different capacity;
Disable the exhaust gas afterburning system.

On sports motorcycles whose engines run at high speeds, the problem with shots may be related to the speed limiter or crankshaft speed limiter. When a certain indicator is reached, the fuel supply may remain unchanged for some time, while the number of flares is reduced. Accordingly, a huge amount of gasoline enters the muffler, which explodes with a jerky sound, forming a “machine gun burst.” It can be heard especially well when releasing the gas after active acceleration. It is impossible to eliminate such a problem without reducing the life of the engine - you have to change your driving style so as not to irritate yourself and others with unpleasant loud bangs.

It is worth paying attention to the ignition system - missed flashes may be due to its malfunction. Carefully inspect the high-voltage wires - there should be no cracks or peeling of the insulation on them. After unscrewing the spark plugs, check to see if there is a specific deposit on their surface that appears when using low-quality gasoline or when the ignition timing is set incorrectly. If the motorcycle is equipped with an electronic ignition system, the problem can often be solved by reprogramming the control unit. Some motorcycle owners decide to make drastic changes by installing a new control unit with preset sport settings - this solves the problem of shots in the muffler, and also increases engine power and improves dynamic characteristics.

Quick diagnostics

Since in the future the problem of popping noises in the muffler can lead to breakdown of the engine and other important components of the motorcycle, it needs to be solved as quickly as possible. You should consistently check the performance of systems such as: intake, ignition, exhaust. All damaged parts are replaced with new ones, connections are sealed. It is also better to temporarily replace tuning components with “stock” ones to check how the engine will perform with factory settings. If all else fails, the motorcycle should be inspected by a professional mechanic, who will find the cause and tell you how to eliminate it at minimal cost and without reducing the life of the power unit.

when using low-quality gasoline;
malfunction of the electronics system responsible for fuel supply;
gasoline does not enter the combustion chamber in pure form;

. Their ignition creates pops.

Why does the scooter smoke?

Have you often seen smoke coming from the exhaust pipe of your scooter? Smoke from the exhaust pipe can be white, black, and other shades. At the same time, color serves as an important diagnostic sign and sometimes directly indicates malfunctions that have arisen in the engine. Before you panic, first tell, find out or remember what kind of engine you have in order to determine whether this is normal in principle, or whether there is some kind of breakdown behind the smoke.

Why does a 2t (two-stroke) scooter smoke?

Two-stroke scooters are known to burn oil along with gasoline. When burning, the oil produces smoke in any case, otherwise it will not be able to burn, even in the most expensive copies. Therefore, if you are a two-stroke scooter owner, you should not be surprised by this.

If the engine is two-stroke, then you should understand that during its operation such an engine will in any case burn oil along with gasoline, and during combustion the oil will always smoke. Even the most expensive two-stroke scooters smoke, this comes from the very nature of the two-stroke engine. So, you shouldn't be scared.

However, this does not mean that the scooter should work like a steam locomotive and smoke very heavily.

If the 2T scooter smokes a lot:

The oil pump may be pumping more oil and needs adjustment
The same is observed if the owner adds an additional portion of oil to the scooter’s gas tank during break-in and as a warning against engine seizure in the hot season and when traveling long distances.
Worn piston can also cause the scooter to smoke.
Check the quality of the carburetor mixture. Perhaps the mixture is enriched. Depending on the design of the engine (for example, on vertical Honda engines), if the oil pump seal leaks, then enough oil can accumulate in the crankcase overnight so that in the morning during startup and warming up, a decent amount of thick smoke will pour out of the exhaust pipe of the scooter
If the owner of the scooter constantly moves at low speeds, unburned oil may accumulate in the muffler, which will then certainly begin to burn out at speed and emit smoke.

It is therefore clear that the nature of two-stroke engines inevitably results in the production of a small amount of smoke during operation. There is no need to be afraid or worry about this.

Why does a 4t scooter (four-stroke) smoke?

Here things are already a little different. The nature of a four-stroke engine is determined by the lubrication of parts in a separate oil bath, which is in no way connected with the combustion chamber. The obstacle, in this case, is the oil scraper rings, which actually prevent the oil from burning along with gasoline. The cause of smoking in a four-stroke engine is most often the presence of oil scraper rings in the piston groove or its wear. Now it does not remove oil from the cylinder walls during operation, and with each power stroke, part of the lubricant burns at top dead center. Naturally, this is a breakdown that needs to be fixed.

Sometimes, many people confuse steam from the exhaust pipe with smoke. Water in the form of steam is a sign of high humidity in the exhaust system. In an unheated exhaust system, moisture from the air partially condenses and becomes visible, and water usually appears at the cut of the exhaust pipe. And as the system warms up, condensation and steam disappear. This is a common occurrence.

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