How to remove a carburetor from a STIHL 180 chainsaw

remove, carburetor, stihl, chainsaw

Adjusting the carburetor of the STIHL 180 chainsaw.

Standard idle adjustment (abbreviated x.x.): turn the screw counterclockwise until it goes tight, then we make two turns clockwise, and that’s it. 2. If the speed is too low x.x. then turn the screw clockwise until the chain starts to move, and then turn the screw 0.5 turn counterclockwise. 3. If too high rpm h.x. then you need to turn the screw counterclockwise until the chain stops rotating, and then turn the screw another 0.5 turn counterclockwise.

That’s it, the carburetor adjustment of the STIHL 180 chainsaw is complete.

Adjusting the carburetor of the STIHL MS 250 chainsaw (with rev counter):

Before adjusting the carburetor of the STIHL chainsaw, it is necessary to service the chainsaw (clean the chainsaw carburetor, wash the chainsaw engine, replace the spark plug, clean the air filter, check the chain tension, adjust the idle speed, warm up the engine).

Screw in the screws “H” and “L” (on a muffled chainsaw) as far as the stop, and then unscrew both by 1 turn. 2. Start the chainsaw and warm it up. Give full throttle and screw “H” to achieve maximum engine speed of 14000 rpm. by the tachometer (by the engine speed meter). Keep the maximum speed for adjustment no more than 10 seconds! 3. Using the bolt “LA” of the idle speed stop, make the chain start to move, and then turn this bolt ΒΌ turn counterclockwise. 4. If, after this adjustment of the carburetor of the chainsaw, the idle speed is not stable, and the chainsaw does not accelerate well, then the screw “L” must be slightly turned counterclockwise until the chainsaw begins to quickly gain momentum and work well at idle. Then correct the bolt “LA” (idle speed according to the tachometer should be 2800 rpm). Attach.

Note: It will not work to adjust the chainsaw carburetor if there is air leaking into the engine from the side (through the gasket under the carburetor, through the carburetor accelerator pump, through the chainsaw crankshaft oil seals, or somewhere else).

Stihl MS 170 Chainsaw old carburetor removal 12/3/11

STIHL chainsaw carburetor

Chainsaw carburetor adjustment using the example of STIHL MS 250

The need for the operation “Adjusting the chainsaw carburetor” is determined by the color of the spark plug electrodes: if black, it means over-enrichment, if brick-gray, it means the norm, if there is white plaque on the spark plug electrodes, then the mixture is lean. The upper screw (closest to the muffler) plays the main role in adjusting the carburetor of the STIHL chainsaw. According to the factory parameters (indicated on the cover of the chainsaw), it should be unscrewed by 1 turn, and then it must be corrected. if you unscrew it, then the working mixture is enriched (more gasoline gets into the air-fuel mixture), if this screw is screwed in, then the working mixture becomes lean (less gasoline gets into the air / fuel mixture).


It may be necessary to adjust the carburetor of the STIHL chainsaw when changing the fuel quality, the altitude at which the STIHL chainsaw is operated (vacuum), as well as when the atmospheric pressure, temperature and humidity of the air change. Chainsaw carburetor tuning allows you to achieve excellent chainsaw performance when external operating conditions deteriorate. Also, adjusting the carburetor of the chainsaw prevents oil starvation and engine damage due to insufficient lubrication entering the cylinder with a lean fuel mixture.

See also  Stihl Mc 180 Chainsaw Oil Hose Replacement

Tip: It is very good to use a special device to check the engine for leaks, i.e. special pump with pressure gauge. First, remove the carburetor on the chainsaw, and install a sealed plate plug with a flange on the cylinder inlet window to connect the hose from the pump. The spark plug can also be sealed with a sealant for airtightness. It is also necessary to remove the muffler, and install a sealed plate with a rubber gasket on the cylinder outlet window. Then you need to put the piston at top dead center and connect the hose from the pump to the flange. Then it is necessary to pump air into the engine up to 0.9 atm. and we look at the arrow of the pressure gauge. if it is in place, then the piston engine is sealed. Then we release the air, switch the device (pump) and begin to pump out air from the cylinder, creating a vacuum in the engine with a pressure gauge reading of 0.5 atm. We look at the arrow of the pressure gauge. if it is in place, then there is no air leakage through the oil seals or other seals in the engine (which impairs the operation of the chainsaw and does not make it possible to correctly adjust the carburetor of the chainsaw). Thus, we check the engine for air leakage and compression.


The carburetor of a chainsaw is a part of the fuel system of a chainsaw, designed for misty mixing of gasoline with air and metering the supply of this fuel mixture into the engine cylinder.

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

Preparatory stage

Repair of any equipment should begin with the preparatory work, and the STIHL 180 saw is no exception. At the preparatory stage, before the STIHL 180 chainsaw is disassembled, it is necessary to remove the side cover, chain and tire from the chainsaw. Further, using a compressor and a brush, you need to clean the chainsaw from dirt, sawdust, oil drips and other things.

remove, carburetor, stihl, chainsaw

When cleaning the saw, pay special attention to the place where the chain saw drive sprocket is located, since this is the most polluted area.

In places with a large accumulation of oil, can be washed with clean gasoline.

Carburetor, muffler and ignition coil

To remove the carburetor, it is necessary to have a head of 8 and an extension, with which it is convenient to unscrew the nuts securing the carburetor and air filter. Before dismantling the carburetor, it is necessary to disconnect the ignition wire and the choke rod from the engine control lever and remove the lever, only after that the air filter and carburetor are removed.

The STIHL 180 muffler is attached with two nuts, which you need to unscrew, pull it towards you, it can be easily removed.

The coil is mounted on two screws, to remove you just need to unscrew them.

Dismantling the clutch and oil pump drive

Before disassembling the clutch, the drive sprocket must be removed. To do this, carefully remove the lock washer from the grooves on the shaft and remove the sprocket and needle bearing.

With a high head 19, you need to unscrew the clutch. The thread on it is left-handed, so it unscrews towards the bar, and not the back of the STIHL 180 saw.

See also  How to Draw a Chain On a Husqvarna Chainsaw

Having unscrewed and removed the clutch, you need to immediately remove the reflective plate and the oil pump drive, this is easy to do, because they are put on the shaft without any fastening.

Removing the handle

Direct disassembly of the STIHL 180 begins with the removal of the handle, which is attached to the body of the chainsaw using three rubber shock absorbers. To remove, it is necessary to remove the plastic plugs from the inner cavity of the shock absorbers, then, using a powerful screwdriver, first squeeze out the upper shock absorber, then the one closer to the rear handle.

At the back of the handle there is a gas trigger, which is connected to the carburetor through a wire rod, in order to disconnect the rod from the gas trigger, it is necessary to unscrew two screws and disassemble the handle.

When the handle remains on one shock absorber, it is necessary to unscrew the body of the chainsaw from the inside of the handle and bend it to the side, remove the body from the last rubber band.

HOW TO. Carburetor & Fuel Line Repair on STIHL 017, MS170, 018, M180 Chainsaw Part 1/3

Removing the flywheel

The flywheel of the STIHL 180 chainsaw is tightened with great effort, so you need a head with a metal knob to remove it. The nut holding the flywheel is unscrewed by the head by 13.

To block the crankshaft from turning, you need to unscrew the spark plug and install the piston stopper through the spark plug hole, if it is not there, you can use the old cord from the starter, with knots tied to it and immersed in the cylinder through the spark plug hole.

It is strictly forbidden to keep the flywheel from turning by installing a power screwdriver and other tools between its ribs and the body, with this method of blocking from turning, the flywheel blades are not able to withstand the load and break off.

After the piston is locked in the cylinder, you can unscrew the flywheel nut. The thread in the nut is ordinary, so you need to turn it to the left. Having loosened the nut, it is not necessary to remove it to the end, it is enough to unscrew it until its upper edge is equal to the tip of the shaft, after which a soft metal drift is installed on the nut and a sharp blow is made on it. Thus, the flywheel jumps off the shaft from a sharp impact and can be easily removed without the help of additional tools.

Disassembly and assembly STIHL MC 180

STIHL MS 180 is a reliable and unpretentious tool, but sometimes it requires repair, like any other equipment. In this article, we will consider how the STIHL chainsaw is disassembled ms 180, which is necessary in the event of an engine overhaul.

Removing the starter

At the next stage, the upper case cover is removed and the 4 starter mounting screws are loosened, after which it is necessary to remove the oil tank and fuel barrel covers. The starter is removed quite simply and there should be no problems.

After removing the starter, the opened inner cavity of the chainsaw must be cleaned, since usually there is a large amount of compressed small sawdust on the body under the starter.

How to properly adjust the chainsaw carburetor

The vast majority of gasoline saw carburetor models have three adjustment screws:

  • idle speed (T);
  • low speed (L);
  • high speed (N).

Setting the required parameters is done by rotating these screws.

Use an electronic tachometer to fine tune the carburetor. It will make it easy to determine the engine speed of the chainsaw.

How does a carburetor work?

All processes occurring in the engine are not cyclical, but a constant basis.

See also  How to replace a chainsaw starter cord. Trying to repair a chainsaw starter with your own hands

How To Clean The Carburetor On A Stihl Chainsaw (MS180C) with Taryl

Acceleration check

If you press the gas button of the chainsaw, the engine should increase the number of revolutions. This should happen quickly enough. If the tool is gaining speed slowly, loosen the screw L a little, no more than 1/8 of a turn.

When the adjustment is completed, you need to re-check the operation of the chainsaw at idle. the engine should work properly, and the chain should remain stationary. If the engine runs unstable or the chain moves, you need to repeat the adjustment, omitting the basic setting step.

Idle speed adjustment

First of all, you need to find the position in which the idle speed will be highest by turning screw L. When you find this position using the tachometer, you need to turn the low speed screw (L) a quarter (1/4) counterclockwise The chain of the chainsaw can rotate during this process. If this happens, loosen the idle screw (T) counterclockwise until the chain stops moving completely.

How to set the maximum speed of the chainsaw?

To change the maximum speed, you need to interact with screw H. If you tighten the screw, the speed will become higher, and if you unscrew it, it will be lower. As a rule, the highest permissible engine speed ranges from 11500-15000 per minute. If you try to work with an even higher number, the ignition problem will begin. In this case, the screw is slightly unscrewed.

Basic carburetor adjustment

Screws H and L must be turned clockwise as far as they will go, and then unscrewed 2 turns in the opposite direction. This is the standard procedure for setting up popular chainsaws for the first time. Other options are also possible.

In what cases is it necessary to adjust the carburetor of the chainsaw?

Here is a list of the most common cases in which you need to adjust the carburetor of a chainsaw:

  • The engine starts, but the chainsaw stalls, or it cannot be started at all. Too much air in the fuel chamber may be the cause.
  • Increased fuel consumption. It can occur due to excessive saturation of the mixture that enters the engine with fuel. For the engine to work well, the mixture must be of good quality.
  • The bolts in the carburetor have lost their hold due to a damaged carburetor housing.
  • Debris entering the carburetor. This can happen if the filter is damaged or poor quality fuel is used. You will need to completely disassemble the carburetor, flush it and re-adjust.
  • Engine idling poorly or not delivering full power.

Important! If the engine is not performing well due to a worn piston, carburetor tuning will not work. In addition, along with the adjustment, it is advisable to clean the carburetor of debris. this will increase the efficiency of the procedure.

Chainsaw carburetor adjustment

Chainsaws are a very popular gardening tool. They have gained great popularity among gardeners and those who care for the territory in the local area. Chainsaws are not complete without construction or repairs. Chainsaws are even more important in the lumberjack profession.

Any chainsaw requires proper care, maintenance and adjustment before use. Overloading the tool can shorten its useful life and damage the tool.

Today we will talk about that part of the chainsaw mechanism, the task of which is to prepare the fuel before it is fed into the engine cylinder. This function is performed by the chainsaw carburetor. It will depend on him how well the chainsaw works and how much fuel it spends during operation. If you see that the petrol chain saw is not working properly, the carburetor may need to be adjusted.