The need for the operation “Adjusting the chainsaw carburetor” is determined by the color of the spark plug electrodes: if they are black, it means over-enrichment, if they are brick-gray, it means normal, if there is a snow-white coating on the electrodes of the spark plug, it means the mixture is lean. The main role in adjusting the carburetor of the Stihl chainsaw is played by the upper screw (closest to the muffler). According to the factory specifications (indicated on the lid of the chainsaw), it can be unscrewed by 1 turn, and then it needs to be adjusted - if you unscrew it, the working mixture becomes richer (more than just gasoline gets into the air-fuel mixture), if this screw is screwed in, the working mixture becomes leaner (less gasoline gets into the air-fuel mixture).
Adjusting the carburetor of the STIHL MS 250 chainsaw (with revolution counter):
Before adjusting the carburetor of the Stihl chainsaw, you need to carry out technical service of the chainsaw (clean the carburetor of the chainsaw, rinse the chainsaw engine, change the spark plug, clean the air filter, check the chain tension, adjust the idle speed, warm up the engine). See also: Banks of Kremenchug. Let's continue with the adjustment:
1. Screws “H” and “L” (on a switched off chainsaw) are fully tightened, and then unscrew both by 1 turn. 3.5. Start the chainsaw and warm it up. Give full throttle and use screw “H” to reach the highest engine speed of 14,000 rpm. by tachometer (by engine revolution counter). Keep the highest speed for adjustment for no more than 10 seconds!
Calm MS 180 idle speed adjustment.
3. Use the “LA” bolt to reach the idle stop so that the chain begins to move, and then turn this bolt ¼ turn counterclockwise. 4. If, after this adjustment of the chainsaw carburetor, the idle speed is not stable, and the chainsaw accelerates poorly, then you need to turn the “L” screw a little counterclockwise until the chainsaw quickly picks up speed and works perfectly at idle speed. After this, adjust the “LA” bolt (idle speed according to the tachometer should be 2800 rpm).
Related Posts
Note: It is impossible to adjust the carburetor of a chainsaw if there is air leakage into the engine that you are not familiar with (through the gasket under the carburetor, through the accelerator pump of the carburetor, through the crankshaft seals of the chainsaw, or in other places).
Advantages and disadvantages
Zama carburetors are very reliable and easy to use. Specifically, the Shtil 180 chainsaw has a carburetor, which does not have screws for adjusting the quality and quantity of the mixture, as we are used to. One screw makes adjustment much easier.
A diaphragm carburetor has no significant disadvantages. With such a carburetor, the chainsaw works in any position. For side cutting, vertical cutting, etc.
Despite the above-mentioned advantages, the carburetor is sensitive to fuel quality. In addition to clean air from the air filter, purified fuel from the gas tank must be supplied to the carburetor. But this is not always possible, so at least once every six months it needs to be cleaned and blown out.
Reference!
Adjusting the carburetor of the Shtil chainsaw will be required when the properties of the fuel change, the altitude above sea level, when the Shtil chainsaw is in use (air rarefaction), and also when the atmospheric pressure, temperature and humidity change. Adjusting the chainsaw carburetor allows you to achieve good chainsaw performance when external operating conditions worsen. Also, adjusting the chainsaw carburetor helps prevent oil starvation and engine breakdown due to insufficient lubrication entering the cylinder with a lean fuel consistency.
Chainsaw calm idle speed adjustment video.
Tip: To check the density of the motor, it is great to use a special device, i.e. special pump with pressure gauge. First, you need to remove the carburetor on the chainsaw, and install a sealed plate plug with a flange on the inlet window of the cylinder to connect the hose from the pump. There is also an option to place the spark plug on sealant for tightness. You also need to remove the muffler and install a sealed plate with a rubber gasket on the cylinder exhaust window. Then you need to put the piston at top dead center and connect the hose from the pump to the 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 one place, it means the piston engine is sealed. Then we release the air, switch the device (pump) and begin to pump out the air from 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 in the workplace, it means there is no air leakage through the oil seals, or other seals in the engine (which aggravates the operation of the chainsaw and does not make it possible to correctly adjust the chainsaw carburetor). In this way we check the engine for air leaks and compression.
Read also: Monitoring the tightening torque of threaded connections
How much does a new carburetor cost?
The average price of a Zama carburetor for a Shtil 180 chainsaw on aliexpress starts from 400 to 900 rubles. The question is whether these are original carburetors. In online stores the price is already higher, from 700 to 3000 rubles.
Shtil 180 chainsaws are in great demand in Russia, primarily due to their reliability. The carburetor is no exception and is also quite reliable and unpretentious. Carburetor adjustment or repair is required only after long-term use, no less than 5-7 years (at average load). The setup process itself has been simplified as much as possible by Shtil engineers; this is the first chainsaw in which only one screw is provided for adjustment.
Home page » Shtil MS 180 Carburetor Adjustment
To come in
Already registered? Sign in here.
There are currently 0 users on the page
There are no users viewing this page.
Among the entire range of chainsaws of the German brand Stihl, the MS 180 model is in highest demand among gardeners. The advantages of this reliable household tool include reliability, increased endurance and an impressive working life. The Stihl 180 chainsaw is distinguished by its ease of maintenance and high repairability, which makes it possible for any novice gardener to use it confidently.
Chainsaw device Shtil 180
The Stihl MS 180 household chainsaw is equipped with a high-quality branded internal combustion engine, configured from the manufacturer to work in difficult weather conditions. The model’s single-cylinder engine successfully withstands long-term high loads without increasing the amount of fuel consumed, and the forged piston group is resistant to corrosion and the formation of burrs. Engine cooling – improved, through intake air masses. For more convenient operation, the Stihl 180 chainsaw is equipped with a factory vibration suppression system, and to reduce noise during operation, it is equipped with a proprietary muffler.
The tool's clutch device includes a proprietary drive sprocket. It withstands long-term loads and does not slip when the speed increases sharply. This makes the Stihl chain saw more efficient when cutting dry, thick logs.
To make it easier to start a cold factory engine, the Stihl MS 180 chainsaw is equipped with a decompression valve designed for manual pumping of fuel.
The working parts of garden tools are a reinforced metal bar on which a chain is tensioned. For more precise adjustment of the tension of the saw set, the Stihl model is equipped with a proprietary front device. Protecting the operator from a broken chain are front and rear hand guards, as well as a chain catcher. To lubricate the saw set, the model is equipped with a proprietary Ematic lubrication system with a durable oil pump. Additionally, the manufacturer included a toothed stop in the garden tool package for more precise sawing of logs.
The Stihl MS 180 chainsaw is distinguished by its ease of use, which was achieved thanks to the manufacturer’s well-thought-out arrangement of controls. The engine start button, throttle lever, factory plastic starter handle and stock throttle position switch are located at the rear of the model. There is a built-in inertial brake lever at the front.
Chainsaw Shtil MS 180 – technical specifications
The high efficiency of the Stihl model in the garden was achieved thanks to decent factory parameters.
Chainsaw features include:
- petrol engine power – 2 liters. s./1.5 kW;
- factory cylinder volume – 31.8 cm3;
- the permissible length of the tire used is 30–35 cm;
- fuel consumption – 200 ml/h;
- the pitch of the chain used is 3/8 “;
- weight including saw set – 4 kg.
The advantages of a chainsaw from the German brand Stihl include a low noise level, which, when the factory engine is running under maximum load, does not exceed 105 dB.
How to start a Shtil 180 chainsaw?
You need to start the Stihl chainsaw in the following order:
- First of all, you need to turn on the inertia brake by pulling its plastic lever away from you;
- Next, you need to carefully remove the protective plastic cover;
- Then you will need to press the standard fuel pump button. Thanks to this, fuel will enter the cylinder and it will be easier for the starter to start the engine;
- Next, the combination switch must be set to the permissible position designated “Cold start”;
- Then, grab the Stihl saw with both hands and slowly pull the plastic lever of the built-in factory starter until resistance is felt. Immediately after this, you need to quickly pull the starter lever toward you several times until the standard engine starts and stalls;
- At the end, you need to pull the inertia brake lever towards you and start working with the tool.
Read also: Do-it-yourself lug lugs for a motor cultivator
Carburetor adjustment step by step
- Check the condition of the air filter. We remove it and either clean it or change it. If the air filter is clogged with dirt and sawdust, the chainsaw will not operate normally.
- We check the condition of the muffler. It must be clean and unclogged. Read more about cleaning the muffler HERE.
- Before you start adjusting the carburetor, you should fill the fuel tank at least halfway.
- If the chainsaw is able to start, then you should let it run for a few minutes to warm up. If the adjustment is carried out “cold”, then the mixture will be over-rich after warming up.
- You need to start adjusting by adjusting the idle speed - screw L. It is highly advisable to have a tachometer, then we focus on 2700 rpm. If not, then we need to find the highest idle speed. In this case, the chain should not rotate. If it still spins (the chain, of course, and not the Earth), then we stop it by rotating screw T. The sound of the chainsaw should be the same as when listening to the file below. https://benzopilatut.ru/wp-content/uploads/2016/01/ Chainsaw -idling.wav
- We regulate high revolutions - screw H. If we rotate it clockwise, the revolutions will increase, and if counterclockwise, they will fall. We tighten it until failures appear in the ignition. After that, turn it out about one-fifth of a turn. The sound of a chainsaw when operating at maximum speed should be like this when listening to the file below. https://benzopilatut.ru/wp-content/uploads/2016/01/ Chainsaw -maximum-speed.wav
- Let's check how the chainsaw is gaining momentum. She should type them smoothly and quickly. If the speed increases slowly, then turn out screw L slightly.
If you have any questions, write in the comments or better in the VK group.
Remember that the optimal carburetor adjustment is:
Running in the Shtil MS 180 chainsaw
After preliminary preparation of the required mixture of fuel and used motor oil, you need to proceed to the scheduled running-in of the new Stihl tool. This procedure plays a huge role, since during its execution all the working mechanisms of the tool fall into place and rub against each other closely.
To break in the Shtil 180 chainsaw, you need to perform the following steps one by one:
- First you need to fill in the fuel mixture and suitable oil to lubricate the saw chain. For this purpose, the saw device has separate tanks;
- Next, you need to turn off the factory inertial brake - this will prevent the plastic case from melting in the clutch area;
- After this, you need to turn on the chainsaw and let it run at idle for about 15–20 minutes;
- Then you need to move on to sawing thin branches. Gradually, the thickness of the branches needs to be increased.
” When breaking in your Stihl MS 180 saw, it is important not to allow the engine to run at maximum speed, as this may lead to the formation of burrs on the surface of the cylinder. Also, during the break-in process, it is not recommended to use motor drills, bark beetles and other common chainsaw attachments.
How does the Shtil 180 carburetor work: device, principle of operation
The main components of the Shtil 180 chainsaw carburetor include the following components:
- fuel pump (with internal diaphragm);
- main (membrane) chamber;
- diffuser;
- throttle and air dampers;
- needle valve;
- fuel jets;
- nozzle with valve;
- idle speed adjusting screw.
The principle of operation is this. The chainsaw crankcase is connected to the fuel pump in the carburetor by a special channel. Due to the alternating stroke of the piston, a vacuum is created in the engine crankcase. Due to this, the diaphragm in the fuel pump rises and the valve opens to supply fuel to the carburetor.
Next, the fuel passes through the filter element (mesh) and enters the main chamber through a special channel. A control membrane is installed in this chamber, which regulates the fuel supply by pressing the rocker arm, which in turn lowers the needle valve.
Raising the control membrane is responsible for the vacuum that occurs in the carburetor diffuser due to the rotation of the air throttle valves. As soon as the engine starts, the mixture needs to be leaner. We lower the air damper, the vacuum in the diffuser is minimal, and the membrane falls into place.
From the main chamber, fuel enters the diffuser using a nozzle with a check valve, or through idle jets (when the gas throttle is closed). There it is mixed with the intake air and the finished mixture enters the engine cylinder. The check valve prevents air from the diffuser from entering the main chamber.
Do-it-yourself adjustment of the Shtil 180 chainsaw carburetor
The factory carburetor of the Stihl brand chain saw plays one of the leading roles in the design of the model. During its operation, he is responsible for mixing the fuel mixture with air and feeding it into the engine cylinder.
Before adjusting the carburetor, you will need to remove the plastic body of the tool and clean the internal parts of the saw from dust and carbon deposits. There are 3 adjustment screws under the housing cover. The first 2 screws are marked with the letters H and L - they are needed to adjust the proportion of fuel and air, which is determined by the level of opening of the throttle valve. When the screws are loosened, the fuel mixture becomes enriched with air, causing the engine speed to drop. If the screws are tightened, the amount of air used in the fuel decreases, which leads to an increase in engine speed.
The screw marked H is required to adjust the maximum engine speed. Screw L is responsible for adjusting the required minimum operating speed of the motor. The third screw, marked S, is needed to fine-tune the operating idle speed of the internal combustion engine of the Stihl MS 180 chainsaw.
Setting up the carburetor of a German brand saw consists of two stages. The first stage is the basic one, or, as it is also called, the factory stage. It can only be done when the engine of the garden tool is turned off. The second stage is the final one. To perform this, a warm engine must be turned on. To know how far to turn the adjustment bolts, you need to read the saw's instructions in advance. It shows the exact setting diagram for each individual screw. Arbitrarily adjusting the bolts without knowing their exact final position can damage the chainsaw motor.
During basic carburetor adjustment with the cold engine turned off, screws H and L must be slowly turned alternately in the direction of the clock hand until it stops. Then each of them needs to be turned 2 full turns in the opposite direction.
The final carburetor adjustment is performed in the following order:
- First you need to start the chainsaw engine and let it run for 5 minutes until it warms up completely;
- Next, you will need to start turning screw H alternately in different directions until the maximum engine speed at idle is found;
- Then the screw marked L must be turned 1/4 turn counterclockwise;
- If after these steps the chain on the bus begins to rotate, then screw S will need to be turned counterclockwise. You only need to finish manipulating the screws S when the saw chain comes to a complete stop;
- Next, you need to set the maximum engine speed using a manual tachometer connected to the engine.
Read also: Diode bridge kbpc5010 connection diagram
After adjusting the carburetor, you will need to check the operation of the engine. To do this, with the instrument turned on, you must sharply press the gas trigger several times. If, when you quickly press the trigger, the engine sharply gains speed, and when it is released, it loses it, it means that the adjustment of the factory carburetor was performed correctly.
Chainsaw High Speed Idling
We adjust the chainsaw carburetor without the help of others
A chainsaw is an indispensable tool for personal home ownership. Therefore, its uninterrupted functioning is very important. The high-quality operation of a chainsaw largely depends on how well the carburetor performs its functions. Let's try to figure out how to adjust the carburetor on a chainsaw without the help of others.
Design and principle of operation of a chainsaw carburetor
As with any other mechanism, before doing anything, you need to understand its structure and operating mechanism. So, a carburetor is a part of the engine designed to mix oxygen and fuel in certain proportions and supply this mixture to the engine. If you have high speeds and the chain is idling the chainsaw (in fact. Violation of the proportions leads to poor engine performance or excessive fuel consumption, or to its complete stop.
The carburetor design is, in general, identical in all saws, with the exception of Chinese-made chainsaws. But, in principle, it would not be superfluous to look at the technical data sheet of the instrument and study the structure of the carburetor. Its main components are:
- tube - an element responsible for portioned air supply by opening or closing the damper;
- diffuser - an element located at the inlet through which fuel is supplied and designed to accelerate the air flow;
- atomizer - a mechanism for injecting fuel into the air flow;
- float chamber - a cavity created to maintain the combustible mixture at the same level. It is from it, through the nozzle, that the fuel enters the atomizer.
Chainsaws Shtil 180 - malfunctions and repairs
The simplicity of the Stihl MS 180 household chainsaw allows its owner to eliminate most of the tool’s malfunctions with his own hands. To successfully repair a model, you first need to determine the causes of the breakdown. The repair algorithm is different in each individual case and depends on the type of malfunction.
Why won't the Shtil 180 chainsaw start?
The reason for the Stihl model not starting, in this case, is that the spark plug is flooded.
To fix the problem, you will need to disassemble the upper part of the tool and unscrew the spark plug. If a thick layer of carbon deposits has formed on the candle, it will need to be cleaned and dried. After this, the clean spark plug can be screwed back in.
What to do if the spark plug on the Shtil 180 chainsaw floods?
If the tool is used frequently, one of its fuel pipes may be torn, which will lead to fuel spilling onto the spark plug and other parts of the saw.
If the fuel tube breaks or a hole forms in it, the owner of the tool will need to remove the damaged hose and replace it with a new one. In this case, the junction of the new hose with the factory fitting must be carefully treated with sealant.
Oil does not flow to the chain of the Shtil 180 chainsaw
One of the main causes of the problem in which oil is not supplied is a breakdown of the pump that supplies oil to the saw set. To fix the problem, you will need to remove the bar and chain, and also dismantle the side protective plastic cover. After this, the area under the housing will need to be cleaned and the pump replaced.
If the chain is not lubricated, the cause of the breakdown may also be a break in one or more oil tubes. In this case, you will need to remove the hoses and replace them.
Chainsaw Shtil 180 stalls when you press the gas
In this case, the cause must be sought in a dirty air or built-in fuel filter. Over time, they become unusable as dirt accumulates on them. To fix the problem, you will need to clean or completely replace the filter parts.
Another reason for this breakdown lies in an incorrectly configured carburetor. The owner will need to first clean the unit from accumulated dust and oil residues, and also adjust it according to the manufacturer’s instructions.
Stihl 180 saw stalls at idle speed - how to solve the problem?
In this case, the cause of the sudden breakdown must be sought in the tool’s ignition system. Often, due to mechanical shocks, the gap between the flywheel and the factory ignition coil is broken, which leads to breakdown of the entire system. In this case, you will need to disassemble the tool and check the distance between the elements.
To adjust the clearance, you need to loosen the flywheel. After this, you will need to insert a template between the flywheel and the ignition coil and begin screwing the bolts back in. As soon as the flywheel comes into contact with the template, screwing in the bolts must be stopped.
Chainsaw Stihl MS 180 is difficult to start when cold
First you need to make sure that the spark plug is not flooded with fuel. If a thick layer of carbon deposits has formed on it, then the fuel system will need to be inspected. It could lose its seal as a result of a broken hose or a broken fuel pump.
If the spark plugs are fine, then you will need to check the air filter. As a result of intensive use of the chainsaw, it could become clogged or become unusable. In this case, cleaning the filter or replacing it will help.
The third element that could fail is one or more compression rings. They cannot be repaired and will need to be replaced.
>
The chainsaw starts and stalls. Why?
There are several simple rules for operating and maintaining a chainsaw, compliance with which will maximize its service life. Preparing the correct fuel mixture, regularly cleaning filters and periodically replacing parts will save you from the need to repair your tool for a long time. If it was not possible to avoid a breakdown, then you can figure out its cause completely on your own. This applies to any brands of chainsaws, from the more complex Husqvarna and Shtil models to the simplest Makita and Patriot models.
The chainsaw immediately stalls
What to do if the chainsaw stalls immediately after starting? First you need to check the presence of fuel in the gas tank. If its level is not sufficient, then you need to prepare the fuel mixture in strict accordance with the ratio of gasoline and oil prescribed in the operating instructions. Gasoline must have the highest possible octane number, and the required brand of oil is usually indicated in the chainsaw’s data sheet.
Next, we check the spark plug, as well as the contact of its tip with the high-voltage wire. The gap between them should be no more than 0.5 mm. If necessary, the candle is cleaned of carbon deposits and dried. It is recommended to occasionally change the spark plug to a completely new one. The reasons why the tool stalls when you press the gas lie in the fuel filter or carburetor jet. Cleaning the gas filter will not take much time and effort, but it is better to entrust the disassembly and cleaning of the carburetor to the service center specialists.
Chainsaw stalls at idle
There are common cases when a chainsaw stalls at idle. First of all, you need to check the muffler, and, if it is dirty, clean it from exhaust tar deposits. Also on carburetors of some models and others there are bolts marked H and L - coarse and fine adjustment, respectively. By adjusting the bolt L while the chainsaw is running so that its speed increases (turning the bolt only half a turn is enough), it is possible to eliminate this problem. Adjusting the carburetor requires an electronic tachometer and is a rather labor-intensive process. That is why in such cases it is better to turn to professionals.
Chainsaw stalls under load
If the chainsaw stalls under load, the cause may be the fuel system or a dirty air filter. Changing the fuel while maintaining the correct gasoline/oil ratio or cleaning the air filter are universal solutions to this problem. An incorrectly prepared mixture of low-quality gasoline and, for example, machine oil is the main reason for the malfunction of a chainsaw, including when it heats up and stalls.
Chainsaw stalls when tilted
When the chainsaw is in a horizontal position, the fuel tube lies at the bottom of the gas tank, but when the tool is tilted, the tube is above the fuel mixture, i.e. in the airspace. This is precisely the reason why a chainsaw stalls on its side.
Chainsaw stalls at high speeds
If the tool stalls at high speeds, you need to check three parts: the air filter, the fuel pump and the gasoline filter. The air filter needs to be cleaned, you can even wash it under water and dry it thoroughly. Then just disconnect the fuel hose from the carburetor and see whether fuel flows out of it or not. If it flows in a full stream, the gasoline filter does not need to be checked. If on the contrary, then a fault has been found. The breather can be cleaned with a regular needle, and the filter can be carefully disconnected from the suction hose, cleaned, or replaced with a new one. The gasoline pump is checked for wear: if fuel does not leak through it, then everything is fine with it. If the problem that your tool stalls at full speed is due to some damage to the pump, then this part simply needs to be replaced with a new one.
- Blog
- About the service center
- Brands served
- Prices for diagnostics and repairs
- Delivery
- Spare parts
- Contacts
Repair and service of garden equipment in Moscow.
Specialized service - comprehensive warranty and post-warranty service for gardening and municipal equipment from world manufacturers! We sell spare parts with delivery throughout Russia! Attention! The information on the site is not a public offer
