Adjusting the Carburetor of the Shtil 230 Chainsaw

Situations in which adjustment is necessary

New chainsaws are supplied by the manufacturer with already adjusted carburetors. This is called standard adjustment. But for the normal running-in process, it is necessary to reduce the maximum engine speed and adjust the carburetor. After break-in, the chainsaw needs fine tuning to achieve maximum engine efficiency.

Also, a signal for cleaning and adjustment is increased fuel consumption, which negatively affects the operation of the exhaust system. Simply put, the chainsaw begins to smoke heavily and the muffler becomes clogged with carbon deposits, which in turn will lead to a decrease in power.

If there is too much fuel in the mixture, engine parts are poorly lubricated and premature wear occurs. Also, a poor quality mixture can cause the engine to jam due to overheating (this is one of the reasons why the chainsaw will not start).

This is what a jammed, overheated piston looks like from a disassembled chainsaw with an incorrectly configured carburetor.

Adjustment is necessary when the engine does not idle, stalls, or does not develop full power. Carburetor adjustment should be carried out with clean air and fuel filters. We also recommend reading an interesting article that details the main reasons why a chainsaw starts and immediately stalls.

How to Adjust Speed ​​on a Shtil 180 Chainsaw

Trimmers and chainsaws

The need for the operation “Adjusting the chainsaw” is determined by the color of the spark plug electrodes: if black. means re-enrichment if brick grey. means normal if there is a white coating on the electrodes of the spark plug. then the mixture will be thin. The main role in setting the carburetor of the Stihl chainsaw is played by the upper screw (the one closest to the muffler). According to the factory parameters (indicated on the cover of the chainsaw), it should be twisted 1 turn and then it should be corrected. if it is twisted, the working mixture is enriched (more fuel enters the air-fuel mixture); if this screw is screwed in, the working mixture is lean (less gasoline falls into the air-fuel mixture).

Content

Adjusting the STIHL MS 250 carburetor chain saw (with speed counter):

Before adjusting the chainsaw carburetor, it is necessary to perform maintenance on the chainsaw (cleaning the chainsaw carburetor, flushing the chainsaw engine, replacing the spark plug, cleaning the air filter, checking the chain tension, adjusting the idle speed, heating the engine).

1. Screw screws “H” and “L” (on the chainsaw attachment) until they stop, then turn them one turn. 2. Start the chainsaw and warm it up. Give full throttle and the "H" screw to give the engine a maximum speed of 14,000 rpm. on the tachometer (according to the engine speed counter). The maximum speed for adjustment should not exceed 10 seconds! 3. Use the "LA" locking bolt to stop the chain, then turn the bolt 1/4 turn counterclockwise. 4. If after this adjustment of the chainsaw carburetor the idle speed is unstable and the chainsaw accelerates strongly, then you need to turn the “L” screw counterclockwise a little until the chainsaw begins to quickly pick up speed and idle well. After this, correct the "LA" bolt (the idle speed on the tachometer should be 2800 rpm).

READ Chainsaw Partner 350 Faults Will Not Start

Note: Adjusting a carburetor chainsaw will not work if air is being sucked into the engine (through the gasket under the carburetor, through the carburetor accelerator pump, through the chainsaw seals somewhere else).

STIHL MS 180 HOW TO ADJUST THE CARBURETOR \How to adjust carburetor STIHL chainsaw MS 180

How to adjust

carburetor
calm
ms
180
what are

the min and max speeds And also a similar video about adjustment on mine.

Stihl chainsaw speed adjustment

Chainsaw Stihl

Like any other complex technical device, it requires maintenance and adjustment.

Reference!

Adjusting the chain carburetor Calmness may be required when the quality of the fuel changes, the height above which the chainsaw operates (air rarefaction), as well as when atmospheric pressure, temperature and air humidity change. Adjusting the chainsaw carburetor allows you to achieve excellent chainsaw performance even with deteriorating external operating conditions. Additionally, adjusting your carburetor chainsaw can prevent oil depletion and engine breakdown due to insufficient lubrication entering the lean cylinder.

Tip: To check the tightness of the engine, it is very good to use a special device, that is, a special pump with a pressure gauge. First, on the chainsaw, the carburetor must be removed and the cylinder inlet must be plugged with a plate with a flange to connect the hose to the pump. The spark plug can also be sealed for sealing. It is also necessary to remove the muffler and install a sealed plate with a rubber gasket in the exhaust window of the cylinder. Then you need to place the piston at top dead center and connect the hose to the pump with a flange. Next, you need to pump air into the engine to 0.9 atm. and look at the pressure gauge needle. if it stays in place, the piston engine is sealed. Then release the air, switch the device (pump) and begin pumping air out of the cylinder, creating a vacuum in the engine with a pressure gauge reading of 0.5 atm. We look at the pressure gauge needle. if it is standing still, then there is no air being sucked in through the stuffing boxes or other seals in the engine (which impairs the performance of the chainsaw and prevents the chainsaw's carburetor from being adjusted correctly). So we test the engine for compression and air compression.

READ How to Cut Laminated Chipboard with a Circular

Adjusting the chainsaw carburetor 180.

Calm 180 carbureted chainsaws only have one adjustment screw. idle speed adjustment screw.

1. Standard idle speed adjustment (abbreviated xh): Turn the screw counterclockwise until it is tight, then make two turns clockwise, and that's it. 2. If the speed is too slow, turn the screw clockwise until the chain starts to move, and then turn the screw 0.5 turns counterclockwise. 3. If the speed is too high, turn the screw counterclockwise until the chain stops turning, and then turn the screw another 0.5 turn counterclockwise.

That's it, adjusting the chainsaw carburetor. Calm 180 completed.

Reference!

A chainsaw carburetor is a part of a chainsaw fuel system designed to mix gasoline with air and distribute the supply to this engine cylinder.

Note: A carburetor chainsaw mixes gasoline with air in a ratio of 1:14, i.e. 1 part gasoline and oil is mixed with 14 parts air, and adjusting the chainsaw carburetor ensures the correct ratio of these components of the fuel mixture.

READ Chainsaw Chain Sharpener

Tools

To adjust, you will need the following tools: tachometer, screwdrivers, and in rare cases, special keys. Let's look at their purpose, necessity of availability and cost.

If possible, setting up a chainsaw should be carried out in official service centers that have a manufacturer’s certificate and appropriate permission to carry out repair work.

Features of operating the Stihl MS 180 chainsaw

This chainsaw model, like its modification – the Shtil MS 180 C BE chainsaw, is not difficult to use. Below we will study the basic operating rules that will protect the main spare parts and mechanisms of the chainsaw from premature wear.

How to dilute gasoline for a Shtil 180 chainsaw?

The chainsaw motor must run on a properly prepared mixture of gasoline and oil. The higher the quality of these two components, the longer your garden tool will last. The proportion of oil and gasoline is also of great importance.

The operating instructions for the Stihl MS 180 chainsaw clearly indicate that the ratio of oil to gasoline must be 1:50.

How to start the Shtil 180 chainsaw correctly?

The correct order for starting a chainsaw is as follows:

1. Before starting the saw, you need to activate the chain brake. To do this, the brake lever must be tilted forward;
2. Next you will need to remove the protective cover;
3. Next, you need to press the decompression valve - this will make starting the engine much easier;
4. After this, press the fuel pump several times. This will reduce fuel consumption directly when starting the saw engine;
5. Then move the combination throttle lever down to the cold start position. To do this, you will first need to activate the throttle lever;
6. Slowly pull the cable until you feel resistance. After this, quickly pull the cable towards you until you hear the engine start and stall;
7. Then move the combination lever up one position;
8. Pull the cable again until the engine starts;
9. As soon as the engine starts, pull the throttle trigger, and, moving the combination lever to the up position until it stops, release it;
10. Release the chain brake lever by pulling it towards you until you hear a characteristic click;

It is worth noting that all of the above steps must be performed every time you start a chainsaw with a cold engine.

How to break in a new Shtil 180 chainsaw?

When starting to use the Stihl MS 180 chainsaw, most owners of the tool do not know how to properly break in the purchased saw. To do this, you must proceed in this order:

1. Check for the presence of chain oil - to do this, place the saw on an old newspaper and start the tool. If there is oil, traces of it will appear on the paper;
2. Next, turn off the inertia brake;
3. After this, start the chainsaw and leave it idling for 20 minutes. In this case, every minute you need to briefly press the gas trigger;
4. After 20 minutes, start sawing thin branches, gradually increasing the density and diameter of the wood.

After completing all of the above steps, you will properly break in the new chainsaw.

How is the carburetor adjusted?

The chainsaw setup algorithm is quite simple and consists of the following steps:

1. Warming up the engine to operating temperature ( the adjustment must be carried out only on a warm engine , this will allow for more accurate adjustment).
2. Adjusting the engine for smooth operation at low speeds.
3. Setting the carburetor to properly supply the fuel mixture at maximum speed.
4. Precise adjustment of the carburetor for idle operation.
5. Checking the chainsaw in all modes.

Almost all carburetor models have three adjustment screws.

• Screw (T) is responsible for fine adjustment in idle mode.
• Screw (H) adjusts operation at maximum speed.
• Screw (L) regulates mixture formation at low speeds.

By tightening screws (L) and (H), the fuel supply and mixture become leaner, and the speed increases accordingly.

Carburetor adjustment screws L - minimum speed and H - maximum engine speed.

Now let’s look at how to properly adjust a chainsaw carburetor in more detail.

Adjusting the Carburetor of the Stihl 250 Chainsaw with Your Own Hands

Content

Do-it-yourself chainsaw carburetor adjustment

For an independent carburetor option, you need to familiarize yourself with its structure and understand the procedure for the work that is carried out to adjust the parts responsible for the proper functioning of the components of the device and parts close to it.

It is necessary to carefully handle items for the system option, and also to determine whether the set characteristics correspond to very acceptable values.

About the carburetor design

The carburetor is used to mix the combustible mixture with air while maintaining predetermined proportions. If clear doses are not followed, the proper operation of the engine is at risk. When a huge amount of air enters during mixing of the components, but there is not enough fuel, then such a mixture is considered “lean”.

Oversaturation should not be allowed, because with a larger amount of fuel compared to air, malfunctions or engine wear are also likely. DIY chainsaw repair Shtil 180 - 142, 240, 365 - video. Carburetor adjustment is needed not only before initial use, but also when any differences in its operation are detected. Before working with a chainsaw, do not forget to run it in.

Carburetor components

The carburetor design contains a standard set of parts, but may vary slightly depending on the manufacturer. Components:

1. The basis . Adjusting the carburetor with your own hands. This is a special tube that is visually similar to an aerodynamic design. Air passes through it. In the transverse direction, a damper is located in the middle of the pipe. Its position can be changed. The more it is extended into the passage, the less air enters the engine.
2. Diffuser . This is the constricted part of the tube. With its help, the air supply speed increases precisely in the segment from which the fuel comes out.
3. Channels for fuel supply. The fuel mixture is contained in the float chamber, then passes into the nozzle, from which it flows into the atomizer.
4. Float chamber . It is a separate structural element, reminiscent of the shape of a tank. Designed to constantly maintain the optimal level of fuel fluid before entering the channel from which air enters.

Don't know which chainsaw to choose? Read our article.

Are you looking for cheaper models, but reliable and time-tested? Pay attention to Russian-made chainsaws.

Or explore foreign chainsaw manufacturers such as Shtil.

What you need to have for setup

Each carburetor owner must have the necessary tools to adjust this system. There are three adjustment screws that are located on the body of the device. They have their own markings:

• L - screw for correcting low speeds.
• H - screw for adjusting high speed.
• T - regulates idle speed, in most cases used for experiments.

READ Chainsaw Huter BS 52 Characteristics

Chainsaw air filter

Before adjusting the carburetor, you need to prepare the device:

1. The engine warms up, that is, it starts about 10 minutes before repairs, and turns off when starting work (see how to start a chainsaw).
2. The air filter is checked and washed.
3. The chain is stopped by turning screw T until it stops (see chain oil).

To carry out a safe repair, you need to prepare a flat surface where you can carefully place the device and turn the chain in the opposite direction. Need a tachometer. It determines whether there is a malfunction in the carburetor. When turning the screws, the sound should be perfect and absolutely smooth. If you notice squealing notes, the mixture is oversaturated.

Setup instructions

Carburetor adjustment is divided into two main stages. The first one is called basic. Correct adjustment of the carburetor of chainsaws 180, 250, 260 and all models of stihl chain saws with your own hands. It is performed with the engine running. The second is performed when the engine is warm.

To carry out the carburetor setup procedure successfully, you need to read the operating instructions for a specific model in advance to identify additional features of setting up the device.

First stage

The adjusting screws for the highest and lowest speeds should be moved clockwise until the highest resistance is met. When the screws reach the stop, you need to move them in the opposite direction and leave them 1.5 turns.

Main stage

The engine is turned on at medium speed and warms up for about 10 minutes. The screw responsible for adjusting the idle speed should move clockwise. It is released only when the engine reaches stable operation mode. It is necessary to ensure that the chain does not move during this process.

HOW TO CORRECTLY ADJUST THE CARBURETOR ON YOUR CHAINSAW //Stihl

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Adjusting the carburetor on a Stihl MS 230, MS 250 chainsaw

In this video we will answer the question of how to configure or adjust a chainsaw carburetor with your own hands

In idling mode, the engine may stall (the reason is here). In this case, you must immediately turn the adjusting screw clockwise until it stops. Sometimes the chain starts to move. In this case, turn the adjusting screw in the opposite direction.

Checking acceleration operation

Need to do a little research. Acceleration of the device is initiated. It is necessary to evaluate the proper operation of the engine during maximum speed. When the engine is functioning correctly, it means that when you press the accelerator, the speed quickly increases to 15,000 rpm.

READ Chainsaw Attachment MB 2 Video

If this does not happen or the increase in speed is too slow, you need to use the screw marked with the letter L. Repairing the carburetor of lawn mowers and chainsaws, repairing the trimmer calm with your own. It turns counterclockwise. Moderate movements must be observed, since the turn cannot be more than 1/8 of a full circle.

Maximum number of revolutions

To limit this indicator, you need to use a screw marked H. To increase the number of revolutions, turn it clockwise, and to reduce them in the opposite direction. The maximum frequency should not exceed 15000 rpm.

If you make this figure larger, the device’s engine will wear out, which will lead to problems in the ignition system. When rotating this screw, you need to take into account the ignition processes of the device. If the slightest malfunctions appear, then the maximum speed value must be reduced.

Final check at idle

Before this procedure, it is necessary to carry out a full adjustment of the carburetor components when operating at maximum speed. Next, you should check the functioning of the device in idle cold mode. When the correct adjustment parameters are achieved, you will notice that the carburetor design closely matches the following criteria:

1. When the idle cold mode is activated, the chain does not move.

Chainsaw accelerator

1. When the accelerator is pressed even slightly, the engine accelerates at an accelerated pace. With gradual deepening of pressure, you can notice that the engine speed increases proportionately, reaching the maximum permissible values.
2. When the engine is running, you can compare its sound to a four-stroke device.

If violations are noticed in the given parameters or the device has not been fully adjusted, you need to perform the main setup step again. Adjusting the carburetor of the Champion 254 chainsaw with your own hands. Initial carburetor adjustment shown. Sometimes actions are performed incorrectly. In this case, the device may fail due to the loss of the correct node settings. In this case, you will have to contact a specialist.

Disassembling the carburetor if necessary to check or repair components

The design of different carburetor models is almost the same, so when working with them you can use the standard scheme. Adjusting the carburetor of the Champion 254 chainsaw with your own hands. Setting up stihl saws. All elements must be removed carefully, and then laid out in the order given below , so that you can successfully place the items in place after the completion of the repair work.

Removing the Top Cover

1. The top cover is removed. To do this, you need to unscrew the 3 bolts holding it in a circle.
2. The foam rubber is also removed, since it is the upper component of the filter that conducts air.
3. The fuel hose is removed.
4. The drive thrust is output directly to it.
5. The cable end is disconnected.
6. The gasoline hose can be completely removed if you systematically pull it off the fitting.

To finally prepare the carburetor for major repairs or replacement of the smallest parts, you need to carefully disconnect it from the main system . Sometimes further disassembly is required. You should unscrew the components carefully and put the fasteners in groups, as these small parts are easily lost.

READ Stihl Chainsaw Corder Video

Instructions for Chinese

To correctly configure the carburetor of a Chinese chainsaw, you must first remember the factory settings of the device, then turn on the engine. Subsequently, you will have to leave it running for several hours in order to accurately set your own parameters. Sometimes work is carried out only after ten minutes of engine operation, but many Chinese-made models require special handling.

Chinese chainsaw model

Adjustment procedure:

1. Activities begin in idle mode . Using the adjusting screws, you need to achieve a systematic increase in engine speed, so you should first let it run at low speeds. A deviation from the norm is the movement of the chain along the bus. In this case, you need to adjust the outer screws to the optimal position so that the chain remains motionless.
2. The transition to medium speed speed is carried out . Sometimes the engine starts to smoke. This defect can be eliminated by tightening the screw to supply a leaner fuel mixture.

In this case, the smoke will disappear, but the engine speed will increase. You need to adjust the settings until you reach a level where, when you press the throttle, the engine smoothly picks up speed, and no sudden jerks or interruptions are heard.

• The device's engine is being checked . The chainsaw is switched to minimum speed, and then the lever is quickly pressed. When pressed maximally, it is held for 3 seconds. If there are problems with the engine, you need to gradually loosen the screw until the optimal position is reached.
• The chainsaw should work for several hours in real conditions . You need to cut wood, and then inspect all the elements involved in this event. If there are deviations, they must be corrected using adjusting devices. When all defects have been eliminated and the optimal settings have been established to supply correctly concentrated fuel, the device setup process can be considered complete.

Take a look at the video:

Conclusion

In order for the chainsaw to work properly, you need to carefully carry out the work of adjusting the carburetor in exact accordance with their order. If any malfunctions occur in the operation of the device, you must completely disassemble it yourself. Correct setting of the carburetor with your own hands in this case. In most cases, replacement of any parts that have become unusable is required.

By constantly checking the quality of carburetor settings and taking timely actions to improve its operation, problems with the chainsaw will not arise.

Read about which chainsaw to choose here.

Source

Process description

1. If the chainsaw carburetor is not adjusted and it is not possible to start the chainsaw, then the adjustment begins by installing screws (L) and (H) to the standard setting position. This is 1/5 turn of the screws until they are fully tightened.
2. After which, you need to start the engine, let it run a little and warm up.
3. The next step is setting the low speed mode. Optimal engine operation at low end can be achieved by adjusting the screw (L) and idle speed (T). To do this, first screw (L) is tightened until maximum engine speed is reached, then released by 1/4, and screw (T) is used to return the idle speed to normal.
4. After adjusting the operation at the “lower” range, the traction and maximum engine speed are adjusted. To do this, slowly tighten the screw (H) and check the speed using the readings of the electronic tachometer. It is unacceptable to exceed the maximum engine speed declared by the manufacturer! The ideal option for this would be to use an electronic tachometer, which can be bought at a low price on Aliexpress.

Buy tachometer on Aliexpress

Location of carburetor adjustment screws on a Husqvarna chainsaw.
An important step is to check the saw in all operating modes after adjustment; to do this, you need to let the chainsaw cool, and then start it according to the cold tool starting algorithm. If the saw starts up normally and idles smoothly, you need to check how it cuts. If during the inspection process shortcomings in the power of the chainsaw are discovered, then it is necessary to repeat the adjustment of the screw (H) by unscrewing it and checking the traction in operation.

Loss of traction at the maximum speed recommended by the manufacturer is an indicator of CPG wear or poor fuel quality. Speaking of fuel, 90% of malfunctions are caused by fuel. Which one should I use? 92 or 95? How long can it be stored? We answered all these questions in the article about what kind of gasoline to put in a chainsaw.

We recommend watching a video on how to clean and adjust a chainsaw carburetor, the author of which also talks about the harmful effects of fuel on the components of the carburetor. The example shows how to restore your carburetor using an inexpensive repair kit.

Adjustment

When purchasing a new chainsaw, the Stihl MS 250 carburetor does not require adjustment - everything is set up from the factory and ready to go! It is required only after a certain period of operation, as a result of which its parts have worn out or broken.

Another reason why you need to disassemble the carburetor is debris getting into the channels. In this case, it is enough to disassemble everything, wash it in gasoline, blow all channels with compressed air and put it back together.

When to adjust?

The first sign that the carburetor needs to be cleaned and adjusted is black (rich mixture) or very light (lean mixture) carbon deposits on the glow plug. With normal adjustments, an optimal ratio of gasoline to oil and a correctly adjusted fuel supply to the internal combustion chamber, the soot on the spark plug will be gray-brick.

Required Tools

To adjust, you will need a tool that everyone has: a set of screwdrivers, a set of open-end wrenches.

The materials you will need are rags and kerosene (gasoline) for washing parts.

Tachometer – for precise adjustment of carburetor speed. This is an important thing, but you can do without it.

Preparation

Before adjusting the carburetor, perform preventive maintenance of the unit:

1. The air filter is cleaned;
2. The entire carburetor is cleaned;
3. The engine is cleaned and washed from dust and dirt;
4. The circuit is being adjusted;
5. The spark plug is cleaned or replaced.

Setup instructions

Step-by-step algorithm for adjusting the Zama C1Q-S85 carburetor on a Stihl MS 250 chainsaw:

1. After stopping the engine, it is necessary to completely tighten the screws “H” and “L”, and then unscrew each one full turn.
2. Next, you should start the engine - the chainsaw should idle for 5-10 minutes.
3. By adjusting screw “H” you need to achieve maximum engine speed (14,000 rpm) with the throttle fully depressed. To accurately determine engine speed, use a chainsaw tachometer. If it is not there, the adjustment should be made by ear - you need to set the maximum speed and then reduce it by about 20-25%.
4. Using the “LA” screw, you need to adjust the idle speed so that the chain on the bar rotates slightly, and then you need to unscrew the “LA” screw 1/4 turn.
5. If the chainsaw stalls or the speed constantly changes, you need to unscrew the “L” screw, and the engine speed should increase.
6. Next, use the “LA” screw to set the optimal engine idle speed, while the Stihl MS 250 should operate at 2600 rpm. This is idle speed.

If the carburetor or cylinder is sucking air, these procedures may not help. Air can enter the engine through a leaky carburetor gasket, crankshaft seals, or accelerator pump.

How to fix this problem, see the video below; the author also talks about adjusting the Zama C1Q-S85 carburetor. In the example, the chainsaw does not start well and stalls during operation.

Setup video

We also suggest you watch another interesting video, the author of which clearly shows how to adjust the carburetor on a Stihl MS 250 chainsaw.

Adjusting the carburetor of a Chinese chainsaw

Carburetors installed on Chinese-made saws are made similarly to European ones and have the same adjustment screws.

Adjusting the carburetor of a Chinese chainsaw follows the algorithm presented above, and differs in that when initially adjusting the screws (L) and (H), they must be turned out two turns. Next, the carburetors of the Chinese saw are adjusted in the same way as European ones.

Read about how to adjust the carburetor of a Chinese chainsaw in just 3 steps here (a very useful article). As an example, we recommend looking at the article about adjusting the carburetor on a Carver chainsaw.

How much does a carburetor cost for a Stihl MS 361 chainsaw?

Today there are at least four types of carburetors for the Stihl MS 361 chainsaw on sale.

They cost from 1600 to 6400 rubles. On foreign sites – about 41 dollars.

The huge price range suggests that some of them are non-original, counterfeit and low-quality carburetors.

Therefore, it is better to buy original Walbro carburetors and repair kits for them. As a last resort, you should take a closer look at the Zam company; they also have good reviews.