Adjusting slide-type carburetors and constant vacuum

Home → Maintenance → Do-it-yourself carburetor adjustment on an ATV.

Very often, tuning and adjusting an ATV carburetor for beginners seems like an insurmountable task, but in fact, this is far from the case. Using our instructions, you can easily adjust the carburetor with your own hands.

Due to incorrect carburetor settings, problems arise such as: failures during acceleration, jerking while driving, uncertain engine start, poor acceleration dynamics, overheating, loss of power, increased fuel consumption, and carbon deposits in the combustion chamber.

So, what exactly are we going to configure?

• Idle adjustment
• Adjusting the mixture quality (special screw on the carburetor).
• Adjusting the quality of the mixture (by shifting the needle position)

Attention! The adjustment is carried out with a warm engine and a clean carburetor.

First, let's make sure there is no condensation in the carburetor. First you need to drain the gasoline from the float chamber, to do this you need to close the fuel valve and partially unscrew screw No. 1, after the gasoline has drained from the float chamber, tighten screw No. 1.

Let's look at photographs of candles with various soot and defects.

A 100% indicator of a correctly adjusted combustible mixture is carbon deposits on the spark plug.

1. Spark plug when the engine is running without faults.
2. Engine with increased fuel consumption.
3. Poor air-fuel mixture.
4. Excessive amount of additives containing metal.
5. Engine after a long period of inactivity.
6. Idle cylinder spark plug
7. Complete destruction of the central electrode with its ceramic skirt.
8. Worn out or stuck oil scraper piston rings.

Let's consider the location of the screws for adjusting the mixture quality and idle speed of carburetors of different models.

No. 1 Screw-plug of the float chamber; No. 2 Mixture quality screw;

No. 3 Idle speed adjustment screw.

1 — idle quality adjustment screw; 2 — fuel inlet fitting; 3 - fitting through which you can drink fuel from the float chamber; 4 — screw-plug of the float chamber.

1 - ventilation tube; 2 — idle speed adjustment screw; 3 — screw for adjusting the composition of the fuel-air mixture.

Adjusting the speed and quality of the mixture of the ATV carburetor.

1. Start and warm up the engine until it reaches operating temperature.

2. By adjusting the idle speed screw, set the speed to normal. Tighten the fuel mixture screw completely until it stops, the engine should stall. If this does not happen, check the air tightness of the air supply system from the air filter.

3. Unscrew the fuel mixture screw 1 turn. (By turning the screw clockwise, we enrich the mixture; by unscrewing it counterclockwise, we lean it).

4. Start the engine and, by adjusting the idle speed screw, set the speed slightly higher than normal

5. Slowly unscrew the fuel mixture screw until the engine reaches maximum speed (we unscrew the screw no more than 2 turns, but depending on engine wear and other malfunctions, the range may fluctuate).

6. By re-adjusting the idle speed screw, set the speed to normal.

7. By pressing the gas trigger several times, check whether the idle speed is stable.

Adjusting the quality of the mixture using a needle.

You've probably heard more than once about adjusting the quality of the mixture on a carburetor by manipulating the needle. I note that these are extreme measures; for initial adjustment, use the mixture quality screw, and only if you do not get the desired result, unscrew the fastener and remove the needle. What is she? This is the main element that regulates the amount of gasoline supplied to the combustion chamber. Connected directly to the gas handle via a cable. When you turn the knob, the needle rises higher, opening the fuel channel, thereby supplying more mixture, which increases power, which is translated into speed.

You will see 5 grooves on the needle at the attachment point. Initially, a locking ring secures it in the central position, this is the best option. But sometimes it is not possible to achieve the required quality of the mixture. Then we will need the remaining grooves, 2 on top and 2 on the bottom, this means that we can adjust the dose gradually.

By lifting the locking ring up and locking it in this position, you lower the needle, and it, in turn, blocks the channel more than usual. There is less gasoline supplied than air, and the mixture becomes leaner. By lowering the ring down, we raise the needle, and everything happens exactly the opposite.

Remember that an excessively lean or rich mixture can lead to serious problems - from overheating to loss of power, carbon deposits in the combustion chamber and all the ensuing consequences. Monitor the condition of the spark plug electrodes; this is the main indicator that will help you determine the quality of the mixture.

If you have any questions about adjusting and tuning the carburetor, you can ask them below in the “Comments” column.

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How to set up a carburetor on a 125cc pit bike

To adjust the carburetor on a 125 pit bike, you first need to check the color of the spark plug. Ideally, the color of the candle should be dirty orange. The second option is more suitable for an experienced pit bike owner. When you start to let off the gas and you hear shooting, this will mean that the mixture is not of the proper quality. And if, when you sharply press the gas pedal, the engine seems to be choking and there is no correct pickup, this also means that the mixture is of poor quality.

The idle speed is adjusted using two screws: a quality adjustment screw and a quantity adjustment screw. If the quality screw is on the diffuser side, then it regulates the fuel supply, and if on the air filter side, it regulates the air supply accordingly. Initially, we set the minimum stable speed using the quantity screw, i.e. your pit bike should almost stall, then we slowly begin to rotate the quality screw. We should hear maximum revs. After the number of maximum revolutions has been found, we begin to turn the quantity screw, setting the optimal speed for the engine.

Irbis ATV250S 250cc 4t (Bashan bs250-11)

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Related content

Honestly, I don’t know where to ask this question, so I’ll create a new topic. The question itself is as follows: when riding in 5th gear, the motorcycle begins to either twitch or kick, and this happens when the gas is open to more than 40% of the throttle. That is, if you drive in 5th gear with gas from 0% (engine braking) to 30/40%, then nothing twitches and everything is absolutely smooth, but if you give gas in the same 5th gear more than 50%, then problems begin, and it seems like I noticed The more gas you give, the more often the bike kicks. I don’t even know how to describe these “kicks”: you’re driving, roughly speaking, with the throttle fully open, and somewhere around 8-15 seconds, it’s as if the traction disappears for a split second, which is why at speed the bike starts to slow down with the engine and you get a strong blow, although Maybe it’s something else; I couldn’t fully understand the specifics of this phenomenon. Moreover, this is observed ONLY in 5th gear, in all others you can drive it at least until the cutoff and nothing will twitch or kick. I don’t even know what to do with this anymore. There was a version with a lack of fuel in the float chamber of the carb, but it disappeared because in the same 4th gear the speed is much higher but nothing twitches there. Next, I was more suspicious of the gearbox, or rather the gears of 5th gear, but this option also seemed to have disappeared because when braking with the engine and when driving in 5th gear with low gas, everything is fine. Well, the last thing that came to my mind was the clutch, I don’t know what could be wrong with it, but I don’t seem to have any complaints about it, so I don’t know what to think. And I also think it’s worth mentioning strange sounds when engine braking, if you start engine braking in gears from 3 to 5, then some kind of clicking (grinding) occurs, sometimes it’s louder, sometimes quieter, but this always happens if you brake with the engine in 3, 4 and 5 gears, for some reason this doesn’t happen in 1st and 2nd, I don’t know if these problems are related to each other, but I couldn’t help but mention this problem because this clicking noise really bothers me. In general, I described it as best I could, I’m counting on your help because I’m not very good at this myself. Thank you in advance!

How to adjust the carburetor on a pit bike

In order to adjust the carburetor on a pit bike. It is necessary to first determine the quality of the mixture. The quality of the mixture must meet the standard. The correct quality of the mixture must be achieved by raising (lowering) the needle. As a rule, the needle must be lowered if the mixture has a dark (black) color, and if the mixture has a very light color, then lower the needle accordingly. If it was not possible to adjust using the needle, then you need to return the ring on the needle to the position in which it was previously.

Another option would be to change the jet. The jet looks like a thick nut with a hole inside and a recess on the surface of the head for a flat-head screwdriver. In order to change or change the size of the jet, you need to remove the carburetor from the pit bike. But first you need to drain all the gasoline and open the float chamber. Depending on the color of the mixture, we select the nozzle; for a light mixture we increase the size, for a dark mixture we decrease it.

If it happens that all your efforts are in vain and the adjustment, alas, did not help, washing and blowing the channels in the carburetor can help (this can happen if sand or dirt has disappeared into the carburetor. For those owners who have little experience or do not have time to adjust the carburetor on your pit bike, we advise, of course, to contact specialists

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

Video on this topic

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“Seat for a needle” - ahahahaha, I’m talking some kind of nonsense)))

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VK https://vk.com/jmd_service Personal page https://vk.com/stuntdanil service website https://jmd-service.ru/ The work we perform.

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Installing the Mikuni VM 22 carburetor on Irbis ttr 125 (adjustment and tuning) (Babzor.ru)

In this video I will tell you in detail and show you how to replace a standard poor Irbis ttr 125 carburetor with a Mikuni vm22.

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Maintenance of the irbis ttr 125 carburetor. Basic setup. Consideration in detail. Also suitable as.

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Carburetor irbis ttr125. Disassembly, cleaning, adjustment. We disassembled the carburetor, which was overfilling, cleaned it and adjusted it.

Setting up the Irbis TTR 125 carburetor

In this video, I will tell you how to properly set up a carburetor. All the subtleties of tuning, and the right approach.

branches: Moscow | St. Petersburg | Ekaterinburg | Nizhny Novgorod | Samara | Ufa | Chelyabinsk | Tyumen | Novosibirsk | Vladivostok | Khabarovsk

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How to set up an ATV carburetor yourself

In most cases, setting up and adjusting the carburetor on your own for beginners seems like some kind of prohibitive task, but in fact, everything is not so difficult. So, from this article you will understand that the carburetor can be adjusted independently and without unnecessary problems, and without contacting specialized services

But it should immediately be noted that incorrect carburetor settings can lead to the following problems:

1. Overclocking failures;
2. Sharp shocks during operation;
3. Weak engine start;
4. Poor acceleration dynamics;
5. Rapid overheating;
6. Sudden loss of power;
7. Excessive fuel consumption;
8. The appearance of carbon deposits in the combustion chamber area

In order to avoid these and many other problems, you should configure:

1. Idle move;
2. Quality of the mixture;

Remember: carburetor adjustment must be done with a clean carburetor and a warm engine!

The first thing you should make sure is that there is no condensation in the carburetor. It is necessary to drain all gasoline in the float chamber. To do this, you need to unscrew the screw and drain the gasoline. Then the screw must be tightened.

Now we need to properly disassemble the locations of the screws responsible for idle speed and for adjusting the quality of the mixture. So, how should you properly regulate the mixture quality and carburetor speed in an ATV?

It's very simple, just do the following:

1. Start the ATV and let the engine warm up properly so that it reaches its normal operating temperature;
2. Constantly adjusting the idle speed screw, set the speed to normal, and then tighten the screws responsible for the fuel mixture all the way. The engine should stall. If the engine does not stall, then it is necessary to check the tightness of the air supply system that comes from the air filter;
3. Now you need to unscrew the screw responsible for the fuel mixture. Exactly one turn. Remember that by turning the fuel mixture screw in different directions, you either enrich the mixture or lean it. Usually enrichment proceeds clockwise.
4. Now you should start the engine and, carefully adjusting the idle speed screws, set the speed to a slightly higher speed.
5. Now you need to start slowly unscrewing the screw responsible for the fuel mixture. It should be unscrewed carefully until the engine reaches the maximum speed point. This usually requires unscrewing the screw a maximum of two turns.
6. Next, you need to re-adjust the idle speed screw, simultaneously setting the speed to normal.
7. And the last thing to do is press the gas a few more times and check the stability of the idle speed.

How to adjust the quality of the mixture using a needle?

Most likely, you have already heard many times about adjusting the quality of the mixture used in the carburetor using a needle. It should be noted that manipulation with a needle is already an extreme measure. It is used if you were unable to achieve the desired result using the previous method. In order to start tuning with a needle, you need to unscrew the mount and remove the needle. What kind of needle is this? This is one of the main elements that can regulate the amount of gasoline supplied to the combustion chamber.

Additionally, there are five grooves on the game. From the very beginning, the locking ring locks the needle in a central position. This is the best option.

Remember that a very rich or very lean mixture can cause really serious problems with your ATV.

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Balbes TV: started a pit. warmed up I unscrewed the quantity screw until the motorcycle started to stall. then turn the quality screw to maximum speed. then again, use the quantity screw to set the comfortable idle speed. All. Why did you set up some kind of cart for 3 hours? As a result, absolutely nothing is clear.))))) He runs here and there. back and forth. and why the hell will you understand)))))

Vlados: Please tell me, I recently bought a used snow leopard, it doesn’t start well and doesn’t hold idle, it drives very well, what’s the problem? Maybe the carb is rich?

Nekit Akhtarov: I'm driving too fast

Maxim Alekseev: when I start the engine, the speed goes off scale, as if at full throttle, the throttle moves but does not react to it. the needle is all in place. Tell me what’s wrong? I just took the needle out of the carb and wanted to move the ring on it by one division and after that it started.

Andrey larovento: Does it have a pz 22?

Eduard Bychkov: thanks patpiska

even though I have kayo, I’m thirstier than namikuni

Sasha Uvarov: I have trouble starting

Ilya Gribanov: Thank you very much

Valery Vasilievich: Hello, oil is leaking from the CGB, the reason

TippOK A: Please tell me about the position of the choke switch (opening the damper). Do you have it all the way down? In summer?

Yuri Noskov: Guys, tell me how to set up the Mikuni 22 carburetor, I have a Wels CRF 125 pit bike, such dances with a tambourine

sun_x: Will misadjustment damage the motorcycle?

Neo Nik: For some reason I used to think that a rotation is 360 degrees.

Anyutka Plaksina: On my kayo 140 the intake gap is 0.5 and the exhaust gap is 0.6

Andrey Dragon: thanks, it helped)))

Bessonnica: damn lilies of the valley, progression for you

Alexander Volkov: Do you mean 0.08 at graduation?

Vingo: told me okay

Alexander Durso: Tell me why, when you sharply open the throttle, it choke and doesn’t pick up speed?

Alex Clark: how to remove dips

Why do you need to tune the fuel system?

The operation and service life of the engine directly depends on the quality of the fuel mixture. The carburetor is responsible for preparing the mixture, but after long-term use of the equipment, the settings get lost. It leads to:

• Problems with starting the power unit. For example, if the carburetor of a 125 cc ATV has not been adjusted, the unit may stop starting or begin to stall.
• Poor response to the throttle trigger and a drop in power. Due to incorrect system settings, the engine speed decreases and, accordingly, its power decreases.
• Failures during acceleration. The traction may disappear for one or several seconds. But the most unpleasant thing is that such failures occur consistently, which significantly interferes with the speed gain.
• Reduced dynamics. The quad becomes “sluggish” and reluctantly picks up speed. In addition, when accelerating, jerks appear.
• Excessive carbon formation. An incorrectly prepared mixture leads to a large amount of carbon deposits appearing in the combustion chamber, which causes the engine to overheat. Naturally, this reduces the life of the engine and leads to its breakdown.

Many riders who decide to buy an inexpensive ATV simply do not spare the equipment and ignore this procedure. But even if you plan to change your device in 1.5-2 years, adjustment is needed. The reason for this is increased fuel consumption. A quadric with an untuned carburetor “eats” 30-40% more gasoline, and this is a significant expense.

ATV Irbis ATV 150 u repair

Home → Repair → Instructions → IRBIS ATV150 U operating instructions. Photo. Video.

• Admin
• 26.02.2017
• 18537
• 2 comments
• IRBIS ATV150 U, ATV operating instructions

Technical characteristics of the ATV:

• Working volume: 150 cm3
• Power: 9.5 hp
• Engine type: Single cylinder four stroke
• Weight: 109 kg.
• Maximum speed: 70 km/h
• Engine starting: electric / kickstarter
• Transmission: CVT
• Brakes: Front disc, rear drum
• Tires: 130/60-13 / 130/60-13
• Weight: 109 kg.
• Transported weight: 150kg
• Dimensions (LxWxH): 1940×690x1139
• Alarm: yes

Operating instructions for the IRBIS ATV150 U ATV

Photo.

Video.

ATV 360 review.

Due to the fact that the operation of the ATV can hardly be called very careful, for a number of objective reasons, I decided to post links to the most complete and professional discussion of repairs and solutions to pressing problems in repairing and tuning the ATV150

Thanks to BankirMan for raising this topic on ATVclub.ru and making an amazing selection!

Manual for engine 125-150 (in Russian) Review of Chinese engines Repair and cleaning of the carburetor Adjustment of the carburetor and more What hoses are on the carburetor for? Starting enrichment, electric valve Electric choke does not work correctly How to drain the oil? and also How to check the generator? Installing a more powerful generator Types of generators (theory) Re-soldering the wiring on the generator stator Increasing the power of the generator (third-party site) I want to change the gear that the starter itself turns (the starter skips). How to unscrew the magneto? and also Repairing the starter (replacing brushes) 1 2 3 4 5 6 Replacing the starter with a motorcycle starter Why is it difficult or difficult to start a quad in winter: Is there a problem with starting? Overrunning clutch

Steering gear

How to make a wheel alignment We replace the old steering mechanism with a new steering (homemade) mechanism 1 2 3 4 5 Steering rod with ends (homemade) 1 2

Wheels + Brakes

Q: I changed the wheels to larger ones, but now I can’t drive uphill, what’s the problem? A: When increasing the wheel size, it is necessary to change the gear ratios in the stars. Read the topic about remaking the stars.

The IRBIS ATV150U 150cc 4t manual for the ATV device contains pages in Russian.

How to avoid problems?

So how do you adjust the carburetor on a Chinese ATV? To do this you need:

• Adjust idle speed. The procedure is performed using a special screw, which is responsible for the quality of the composition and the number of revolutions.
• Optimize the quality of the fuel composition.
• Adjust the gasoline level.

However, it is important to remember that all adjustments are made only with a “clean” carburetor. This means that the rider needs to remove all dirt from the assembly and flush the system to remove condensation and sediment from it.

Note: Immediately before adjustment, the engine should be warmed up to operating temperature.

How to adjust the carburetor on an ATV?

To adjust the idle speed of the carburetor, you first need to clear the float chamber of fuel. To do this, start the all-terrain vehicle, close the fuel valve and wait until the vehicle stalls (5-10 minutes). To speed up the process, you can ride a little on a quad. Of course, you can drain the gasoline, but in any case you will have to warm up the device, so the first method of “removing” gasoline is more effective.

After this you need:

• Open the tap.
• Start the device.
• Screw in the bolt (No. 2), which is responsible for the quality of the mixture, until it stops. Remember that to enrich the composition you should turn to the right, and to deplete it to the left. If the quad stalls at this stage, it means there are problems (the pipes have become depressurized).
• Turn screw #2 once (to the left).
• Increase idle speed using bolt #3. Start the quad and check the speed. They will be slightly higher than standard indicators.
• Unscrew bolt No. 2 (turn it 2-2.5 times). After this, the engine should reach maximum speed.
• Start adjusting the system using screw No. 3. Focus on sound. The engine should run smoothly, without any strain.
• Step on the gas. This will make sure that the speed does not drop.

To avoid mistakes, read the instructions before adjusting the carburetor on a 125 cc ATV. Remember that the location of the bolts differs in different devices, so read the documentation in advance.

ATV IRBIS ATV 125 yellow with PSM

Go to the product page, select the quantity you need and click on the shopping cart icon. You can then continue shopping or proceed to checkout.

Step 2

While the order is not completed, you can change the number of items in the cart, delete individual products - the cost will be recalculated automatically. At the end, check the data and, if everything is correct, click the “Place an order” button.

Step 3

After going to the cart, indicate how you want to receive your order:

• Pickup
• Delivery within the city
• Delivery by transport company

Pickup. It is necessary to mark one of the pickup addresses.

Delivery within the city. It is necessary to indicate the exact delivery address and the date when it is convenient to receive the order

When selecting “Delivery by transport company” you will need to fill in the following data:

name of the transport company

delivery address

contact details (name, phone number, e-mail)

Step 4

Then you should select a payment method. Regardless of how you want to receive your order, you can always pay by card online. When picking up, you can pay for the Order in the store - by card or in cash. When delivering by courier within the city, payment by card is available upon receipt. When delivered by a transport company, the ordered goods are paid for before dispatch in any convenient way - online by card, in cash or by card in the store.

How to adjust the quality of the prepared mixture?

To evaluate the quality of the fuel composition, do a test drive. After this, unscrew the spark plug and assess its condition. If she:

• Brown (near the insulator). This means everything is fine. But if such a shade is only on one side, the composition is too poor.
• Black (on insulator). Soot signals that the system is delivering too much fuel. However, if the entire spark plug is black, it means the composition is too rich, which increases gas mileage.
• White (insulator). This means there is not enough fuel and air. And if the mixture is too lean, the entire candle will be white.
• Red. This means there is a high concentration of metals in the composition.

​

Also pay attention to the following “symptoms”: damaged tip (electrode malfunction), oil deposits (damage to rings and caps), chips and inclusions (a sign of motor destruction).

To adjust the mixture, you need to twist the needle cap and pull it. To get the needle, pull out the cable. After this, move the ring in the required direction (lower - more air, but less fuel and vice versa). Then start the engine and make sure it doesn't stall.

Adjusting slide-type carburetors and constant vacuum

The most obvious need for some form of idle speed control is usually provided by an adjustable 'throttle limiter', which sets the minimum opening of the throttle valve or gate at a desired point. In most cases, this is a stop screw on the side of the carburetor, although on multi-cylinder motorcycles with interconnected carburetors, a single adjustment screw is used to adjust the idle speed, acting through a link on all carburetors at once. Only on rare models of mopeds, for reasons of economy, this adjustment is absent, and the same result is achieved using a throttle cable.

Adjusting the idle mixture [ ]

The idle air adjustment screw determines the amount of air entering the idle system

To accurately adjust the idle mixture, it is necessary to provide some way to control the quality of the mixture. This can be achieved by changing the amount of air entering the idle system using the air adjusting screw: dosing

fuel is produced by the idle jet.

Another method is to change the total volume of the mixture with the idle mixture screw, while dosing fuel and air is carried out using jets. Both schemes are widely used.

Adjusting the fuel level [ ]

Adjusting the fuel level

It is necessary to set the correct fuel level relative to the carburetor jets, otherwise there may be a negative impact on the mixture composition of all systems, throughout the entire engine speed range.

Many manufacturers indicate either the float height, which can be measured with a ruler after removing the float chamber, or the fuel level, which can be measured by attaching a graduated glass tube to the float chamber drain screw.

The height of the float can be adjusted by bending the small tongue on which the needle valve rests. It should be noted. that an incorrectly adjusted fuel level can cause malfunctions, especially on multi-cylinder engines.

Selection of jets [ ]

The capacity of all kinds of jets usually does not require changes after it has been selected by the manufacturer, but if conditions require replacement, jets with a slightly larger or smaller capacity can be installed. In addition, you can replace the dosing needle by installing a similar one, but of a different profile. This allows you to quite subtly change the influence of the dosing needle.

On many cars you can find one or more corrective air jets in the air inlets of the carburetors. They are typically set by the carburetor manufacturer to use one basic carburetor casting to produce a variety of carburetor types. These jets cannot be changed.

Settings (“Tuning”) [ ]

Some owners try to improve the performance of their engine by “tuning” carburetors. But it makes no sense to change only the carburetor jets; this can lead to negative results if you do not change all other components so that the resulting system works in harmony.

There is no doubt that with an increase in the throughput of the nozzles, a larger amount of fuel will enter the combustion chamber. But if the mixture was lean to begin with, or you are only trying to achieve a minimal increase in the air-fuel ratio, then to get up to a 10% increase in the 14.7:1 ratio at which maximum power (and maximum fuel consumption) is achieved, it is pointless to increase the amount of fuel entering the combustion chamber unless more air is supplied with it. This means replacing the air filter with one with less flow resistance.

In addition, it makes no sense to introduce more air-fuel mixture into the combustion chamber if the exhaust gases cannot leave it, which requires installing an exhaust system with less flow resistance. And even then, there is a limit to the additional volume that can be supplied and forced out of the combustion chamber, in this case the valves. Since it is usually not customary to increase the diameter of the valves, the only solution may be to install different camshafts with cams that provide increased valve lift and phase duration, which will undoubtedly increase maximum power, but will deteriorate engine performance at low and medium speeds .

Other problems associated with tuning: which air filter will fit a given exhaust system, how much the throughput of the jets needs to be increased for the most effective use of other tuning units. The job of determining the most suitable jets is extremely labor intensive and involves trial and error, requiring extensive testing.

A solution to problems associated with difficulties arising during tuning is offered by testing on running drums. The system's data store records collected information about engine speed, rear wheel speed and exhaust emissions. From this data, effective power and torque graphs can be obtained (for analysis). Such studies use specialized testing equipment, and require a specialist with a range of knowledge and skills to interpret the results of the study.

Setting the gasoline level

The last step in adjusting a 125cc ATV carburetor is to adjust the gas level. To do this you need:

• Find the drain hose.
• Lift the bottom of the tube.
• Unscrew the screw and remove the mixture.
• Open the float chamber.
• Find the tab that covers the needle.
• Bend it slightly downward to increase the fuel flow rate.

Note: Be careful when making adjustments as the system components are very fragile. Ideally, carburetor adjustment should be carried out by a specialist.

Why do you need carburetor adjustment at all?

For stable operation of the ATV, it is necessary that the engine receives the optimal amount of fuel mixture corresponding to its speed range. Otherwise, the following problems may occur:

• Difficulties with the factory, the engine constantly stalls.
• Weak power characteristics, sluggish response to the throttle trigger.
• Poor dynamics when accelerating from the bottom, accompanied by spontaneous jerks when moving.
• Dips observed mainly during overclocking.
• High fuel consumption.
• Excessive formation of carbon deposits on the walls of the combustion chamber and, as a result, overheating of the engine.

What needs to be done in this case:

1. Adjust the idle speed using the mixture quality screw and the number of revolutions.
2. Adjust the quality of the mixture using a needle.
3. Adjust the fuel level.

Important! Make adjustments only when the carburetor is cleaned inside and out, and when the engine is warmed up to operating temperature.

Adjusting the carburetor Stealth 500

Most modern car engines are equipped with fuel injection systems. But when used on motorcycles, the advantages of such equipment are not obvious. This is why many ATV manufacturers still install carburetors on their products. This approach is completely justified, provided that the part is made with high quality, and the quality of the fuel mixture and speed are adjusted correctly.

Do no harm!

It is no secret that many owners of Stealth 500 ATVs criticize the design of the carburetor installed on the car, believing it to be the main culprit for the incorrect operation of the fuel system and problems with the traction characteristics of the engine. There is no doubt, there are certain grounds for such statements. But when trying to do their own repairs, some motorcycle owners forget that interfering with the operation of a complex device without the appropriate knowledge and training can bring irreparable harm rather than benefit.

Why do you need to tune the fuel system?

The operation and service life of the engine directly depends on the quality of the fuel mixture. The carburetor is responsible for preparing the mixture, but after long-term use of the equipment, the settings get lost. It leads to:

• Problems with starting the power unit. For example, if the carburetor of a 125 cc ATV has not been adjusted, the unit may stop starting or begin to stall.
• Poor response to the throttle trigger and a drop in power. Due to incorrect system settings, the engine speed decreases and, accordingly, its power decreases.
• Failures during acceleration. The traction may disappear for one or several seconds. But the most unpleasant thing is that such failures occur consistently, which significantly interferes with the speed gain.
• Reduced dynamics. The quad becomes “sluggish” and reluctantly picks up speed. In addition, when accelerating, jerks appear.
• Excessive carbon formation. An incorrectly prepared mixture leads to a large amount of carbon deposits appearing in the combustion chamber, which causes the engine to overheat. Naturally, this reduces the life of the engine and leads to its breakdown.

Why won't my ATV engine rev up?

Owners of ATVs quite often encounter the fact that the motorbike stops gaining momentum. In this case, the vehicle engine itself can work flawlessly, but the dynamics are noticeably reduced. Therefore, it is not enough just to buy an ATV in Kyiv. It is necessary to carry out regular maintenance, promptly identify and repair any breakdowns that occur.

Please note that children's and small-sized models of ATVs with a capacity of up to 110 cubic meters do not have high dynamics, and therefore are not able to develop a high number of engine revolutions. But if we are talking about a powerful 200cc iron horse, then there is already something to worry about.

ATV stalls at idle

Problems with gaining speed in ATVs can arise under the influence of a number of factors, ranging from low-quality fuel to contamination of various functional components of motor vehicles. Most often, the reasons for this behavior of a motorbike lie in the following:

• poor quality fuel;
• liquid entering the fuel tank;
• clogged filters;
• the fuel pump is broken or clogged;
• the carburetor is incorrectly adjusted or very dirty;
• injectors have failed;
• failure of the electronic control module;
• problems with the operation of coils and spark plugs;
• contacts are damaged;
• engine overheating and too much carbon deposits;
• Sagging variator belt.

Owners of carburetor ATVs are faced with the fact that the motorbike does not maintain speed more often than others. The reason lies in incorrect system configuration. To return the speed dynamics to normal, you will need to adjust the carburetor. This process includes selecting high-quality fuel, setting the optimal fuel level in the tank and idling.

To perform the above steps, a novice rider is recommended to seek the services of a good motorcycle service center.

The ATV does not gain speed and stalls

Most often, troubles with an ATV engine begin when the idle speed begins to drop. If the motorbike engine is not working, then it is better not to delay it, and contact a service center for diagnostics and repairs as soon as possible.

You can find out that the ATV engine has started to stall by the following signs:

• strong vibration is felt at idle speed;
• engine power is significantly reduced;
• Difficulties are observed when starting a cold engine.

If such a breakdown is observed in the ATV, then it is better not to drive it until it is repaired. When your engine stalls, you not only run the risk of wasting too much fuel and causing the engine to wear out prematurely, but you can also get into an accident at any moment.

When the ATV suddenly stalls and does not hold speed, it is a good idea to check the cylinder compression. It can decrease for a number of reasons:

• wear of cylinder rings;
• excessive loads when operating an ATV, which is quite typical for this type of equipment;
• incorrect cylinder bore;
• low-quality or incorrectly selected spare parts, as well as errors during their installation.

A good compression indicator for a used ATV is considered to be 10 bar. As a rule, the higher this value, the better. If the compression of your ATV is too low, then you should carefully inspect the entire functional unit in search of failed components. After replacing worn components, it is necessary to thoroughly lubricate each element. Also check the ATV cylinder tubes for leaks.

Checking the oil in the ATV

The vast majority of ATVs are equipped with a four-stroke engine, each functional unit of which requires high-quality and timely lubrication. It is best to use lubricants from proven and reliable global manufacturers, and also select them in strict accordance with the model of the motorbike. The lack of a sufficient amount of oil in the ATV or its poor quality very often leads to the fact that the motorcycle no longer reaches the required number of revolutions.

How to adjust carburetor idle speed on an ATV

1. To get rid of condensation that regularly appears in the carburetor, drain the fuel from the float chamber - close the fuel valve and unscrew screw No. 1 until it stops. Wait for the gasoline to drain completely and tighten screw No. 1 back.
2. Start the vehicle and let it warm up for a few minutes.
3. Tighten the mixture quality bolt No. 2 until it stops. The engine will stall at this stage. If this does not happen, the tightness of the air supply system pipes is most likely broken. Check it out. Then turn bolt #2 one turn. The mixture becomes richer in a clockwise direction, while it becomes leaner in a counterclockwise direction.
4. Increase idle speed using screw No. 3 and start the ATV. The number of revolutions should be slightly higher than usual (in some models the idle speed adjustment bolt is located on the right side of the four-wheeler).
5. Unscrew the fuel mixture quality screw No. 2 so that the power unit reaches maximum speed - approximately 2-2.5 turns.
6. Start leveling the idle speed using bolt No. 3 until you hear a smooth, smooth sound of the engine running.
7. Press the throttle trigger several times to check the stability of the idle speed.

Note. The location of the bolts may vary on each carburetor model, so check the instructions that came with your carburetor.

Topic: High idle speed

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High idle speed

Tubers, has anyone encountered this problem? After a short drive around the city, at stops and in neutral, high stable revolutions of 1500-1600 are maintained. In this case, the tachometer needle does not float up and down. After a slight revving, the speed drops to 800-900. What could it be related to? I searched and didn't find anything similar.

I think we need to start by washing the throttle valve and the speed control valve. Look how freely the throttle cable moves in the jacket.

I would have looked at the air first, this has already happened!

I have the same thing. the cable is biting. I've weakened it for now. I ordered a new one, I'm waiting

This happens to me if I drive the car after warming it up a little, then as it warms up it goes away on its own

SEGUN

This started happening to me after installing blow-off. They usually start in traffic jams. Most likely due to blow-offs.

It was so. Cleaned the throttle body and XX valve. The same. Changed the xx sensor. Sometimes it holds 900-1000 instead of 700. I adjusted xx so that instead of 700 it was 500, now it does not rise above 800. At idle now the car is almost inaudible)) but it began to stall more often from the blow-off. What exactly is the problem, in short, it’s not really clear (((

What could be the reason for low idle speed? I have 400-500 and the check is still on

566

You will find out the reason by reading the error. Otherwise, it's fortune telling on coffee grounds.

What speed is considered optimal? from the factory! It’s just that 750 somehow confuses me. on other cars, albeit vegetables, it was around 900. or is this prejudice?

Shaman

I wish I knew how to do this.. it makes sense to read the error

566

Through a scanner, if there is no OBD connector, then we connect two black chips under the steering column and count the blinking of the check! ) Something like this!

650 x.x. no load, MT automatic like 750

In the summer there was a problem, after standing in a traffic jam, the idle speed increased to 1800. First 850, 1000, 1200 and so on until 1800. I noticed that with an increase in the intake air temperature, the speed increased. For example: speed 730-735 , intake air temperature is 25 degrees, the amount of intake air is 2-3 grams per second - this is normal engine operation. After 30 min. in a traffic jam the rpm is 1600, the intake air temperature is 65 degrees, the air flow is 6-7 grams per second. - lousy engine performance. It was summer. Today I stood in a traffic jam for about 60 minutes and saw that the speed had risen to 1100 rpm, while the air temperature at the inlet was 37 degrees, the air flow rate was 4 grams per second. After I left the traffic jam, the speed dropped to 730-740, the flow rate air up to 2 grams per second, intake temperature up to 5 degrees. Moreover, the opening time of the injectors was the same in all cases. what could it be?

HOW TO ADJUST THE CARBURETOR ON AN ATV

First of all, we free the float chamber from residual gasoline. We turn off the fuel supply and start the engine, wait a few minutes until the engine stops completely. To speed up the process, you can also ride an ATV.

Next you need:

• Open the fuel supply valve.
• Let's start the engine.
• We tighten the bolt, which is responsible for the quality of the mixture, until it stops. Important: for a “rich” mixture you need to turn it counterclockwise, for a “poor” mixture clockwise. If the engine starts and immediately stalls, then there is a possibility of depressurization of the pipes.
• Turn the screw responsible for the mixture counterclockwise one turn.
• We increase the speed using the “quantity” screw. We start the engine and look at the speed. They should be slightly larger than usual.
• Unscrew the mixture screw (turn 2-2.5 times). Next, the engine reaches maximum speed.
• Using the “quantity” screw, we adjust the operation of the power system. Engine operation should be free of choke.
• By pressing the accelerator handle, make sure that the speed does not decrease.
• Before adjusting the carburetor on an ATV, you need to study the instructions, since the location of the adjustment bolts may differ on different models.

| ATVs |

Repair of Stealth ATVs Repair of Stealth ATVs of any complexity. Tuning, frame strengthening, installation of additional equipment, tuning.

Delivery of an ATV to any region We can arrange delivery of this ATV to almost any region of Russia. Details can be found by calling (495) 960-77-06 or sending a request by email [email protected]

About the ATV The Stels ATV 600 GT ATV ​​is that golden mean of reasonable price and excellent quality. Well, name at least one all-terrain vehicle, 90 percent consisting of Japanese components, that would cost 250,000 rubles. The modern and powerful, but not at all voracious, engine of the Stels ATV 600 GT takes the ATV to cruising speeds of 80-90 km/h in a matter of seconds. And if you turn the throttle to full, then in a few moments the speed of the Stels 600 GT ATV ​​will exceed 100 km/h. of the Stels 600 GT ATV ​​is definitely on par with such brands as Yamaha, Polaris, BRP, Artic Cat, Honda... But in terms of price it can outshine any Chinese brand. There is only one conclusion - you have to take it!

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Taking care of you, we offer you free delivery throughout Moscow and the region* of the Stels ATV 600 GT . In addition, you will receive a discount on the registration of an ATV and on the “license” of a tractor driver.

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Helmet 3,500 rubles

Tire set 27″ 25,000 rubles

Oil 4T 500 rubles

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Adjusting the ATV carburetor mixture quality on the go

1. Start the ATV and take it for a test ride. Wait until the engine has completely cooled down.

2. Check the condition of the spark plug. To do this, unscrew the cap and inspect the spark plug.

What to pay attention to:

• A light brown coating around the entire circumference of the insulator is a sign of optimal carburetor operation.
• Brown color on one side of the insulator means the engine has a lean mixture.
• A thick black deposit on the spark plug insulator is an indication that the carburetor is supplying too much fuel mixture while the ATV is moving.
• A completely black plug, insulator and electrode are too rich a mixture, which results in excessively high fuel consumption and a decrease in power, as well as gas pollution in the chamber.
• White insulator - lack of air and gasoline supply. Leads to overheating and increased gasoline consumption.
• A completely white spark plug is a too lean mixture.
• Brick color - a large amount of additives with a high metal content in the composition.
• The absence of carbon deposits and the simultaneous melting of the electrode means a very lean mixture at high speeds.
• A spark plug with a broken tip is a breakdown of the central electrode with a ceramic skirt.
• A spark plug with oil deposits inside the electrode is a sign of used rings and valve stem seals.
• Shiny inclusions and shavings indicate engine destruction due to driving at high speeds.
• Oxidation - problems with piston rings.

3. Unscrew the needle cap at the top of the carburetor. Pull the needle. This is the main element that regulates the supply of fuel to the combustion chamber, since the needle is connected to the gas trigger. When the trigger is pressed, the needle rises, slightly opening the hole for supplying the fuel mixture. This directly affects the increase in power and speed of the ATV.

4. Remove the cable, then press the needle to pull it out. The needle has 5 grooves and a locking ring. By default it is set to medium. The lower the locking ring is located, the higher the needle is raised, which means a lot of gasoline and little air is supplied. Accordingly, the higher the ring, the less gasoline and more air.

5. Move the retaining ring in the desired direction to optimize carburetor performance. Insert the needle into place.

6. Start the engine and pull the throttle trigger. If adjusted correctly, the engine should not stall from sudden pressure.

And remember, you should resort to adjusting the needle only as a last resort, when adjusting the quality and quantity screw does not bring any results.

The best carburetor for Irbis TTR 125

Irbis TTR 125, unfortunately, has not earned the best reputation, but all because it has a little more jambs than any other pit bike. In general, this is the same pit as all the others: it breaks in the same way, and it also has its own weak points.

With proper running-in and regular maintenance, the engine lasts quite a long time. And remember that this is the very first and cheapest mass-produced pit bike that appeared in Russia!

Naturally, any technique can be improved, modified and simply made to suit you.

As written above, the engine is quite good for its price, but like the YX 140, it is pretty strangled by the carburetor.

And if on the same kai, on the 140 engine, there was at least a good copy of the MIKUNI VM 22, and it starts and drives on it, but not at all at full strength, then that set of bolts with crooked holes in the body, which the creators of the snow leopard call a carburetor, defies any logic or explanation.

The native “carburetor” of the snow leopard cannot be adjusted in principle! It would have a greater effect if you manually poured gasoline into the engine than using a native carburetor.

So, it cannot be adjusted; therefore, you will not be able to adjust the working mixture normally, and this leads to two things. First, the mixture will be lean, which means an increased temperature of fuel combustion, an engine wedge, burnt-out valves, and often a burnt-out exhaust at the bend.

The second case is when the mixture is rich. Starting will be complicated, because the spark plug will constantly be flooded, and while driving, the engine will not work at full power, but will simply choke, and your snow leopard will not drive normally.

Naturally, there can be no talk of any stable work; there will always be some problems.

But the solution to this problem is extremely simple - installing a MIKUNI VM 22 carburetor.

By the way, despite the fact that the carburetor is not very expensive, quite often they sell new used carburetors that are removed from the Kae 140, for which it is frankly too small.

What will this carburetor give you?

And it will give you the opportunity to correctly configure the working mixture. Your engine will last much longer, since there will be no chance of overheating and jerking when the mixture is rich.

Naturally, after installing the mikuni, the snow leopard will ride much more vigorously, and you will feel it immediately. Of course, when driving, the dips that occur at high speeds will disappear, because hurray - you will have a normal mixture!

You can start the engine by hand in any weather and, probably, under any conditions. In this case, the engine will not stall, then gain or lose speed, but will run smoothly and smoothly.

Everything written above is based not on theory, but on practice, and on several snow leopards. At first you suffer, trying to adjust your original carburetor. Then, after the 10th attempt, I simply bought a mikuni and voila! Perfect engine operation is ready! Without unnecessary problems and hassles)

As for the results of the sea trials, as a form of mockery, each gear was cranked up to the cutoff and he picked it up as long as the throttle was turned. No jerks, failures or inappropriate actions on the part of the pit.

Bottom line: If you have an snow leopard TTR 125, then we recommend that you install Mikuni VM 22 on it. By doing this you will not only make your life easier and protect yourself from constant repairs, but also get stable engine operation and extend its service life.

Source

Adjusting the fuel level in the float chamber of ATVs

The performance of a four-wheeler depends on the correct level of gasoline in the carburetor. An excessive amount will flood the candles, spill on the ground and lead to unnecessary expenses. If too little fuel is supplied, the engine simply will not start.

How to optimally adjust the fuel supply

• 4-stroke ATVs have carburetors with an opaque drain hose tube hanging down. Therefore, first of all, replace it with transparent one.
• Lift the free end of the hose up.
• Unscrew the drain screw next to the tube to get rid of excess fuel. Based on the amount of liquid entering the tube, determine the level of gasoline in the carburetor. The norm is the line (1-1.5 mm below is allowed) between the housing and the float chamber.
• To adjust the fuel supply level, open the float chamber and find the tab that covers the shut-off needle.
• By bending the tongue down, you will increase the intensity of fuel delivery. By bending it up, on the contrary, lower it. Perform all manipulations with caution, as the structure is quite fragile.