Chainsaw stalls at idle

There is a spark, the candle is wet. how to solve the problem?

A wet spark plug indicates an imbalance in fuel mixture preparation. In this state, the part is at first still capable of generating a spark, but gradually this property of the candle is lost. In addition to the wrong ratio of oil and fuel, there are a number of reasons why the element is flooded.

  • severe clogging of the air filter;
  • failures in the settings of the carburetor;
  • malfunctions in the regular ignition system;
  • incorrect sequence of actions when starting a cold engine;
  • poor quality gasoline.

In the first case, chainsaw repair is carried out by thorough cleaning or complete replacement of the tool’s air filter.

If during operation the tool began to consume a large amount of fuel, and the engine speed began to constantly “float”, decreasing and increasing every 5–10 seconds, then the owner of the chainsaw should adjust the carburetor.

With the repair of a standard ignition system, everything is a little more complicated. To do this, check all electrical wiring and measure the gap between the high-voltage wire and the tip of the candle. If necessary, also clean the ignition system from blockages.

If none of these faults could be found, then you will need to study the instructions. The operator may be starting the tool in the wrong sequence.

If none of the above helped, then the cause of the breakdown is poor-quality fuel. In this case, you need to drain the remaining gasoline and fill in new fuel with a higher octane rating.

Chainsaw does not discount turns. how to find and eliminate breakdown?

The most common cause of this frequent failure is an improperly adjusted damper. It is necessary for the intake of air, which is required by the carburetor to enrich the fuel mixture with air. To adjust the damper, you need to adjust the operation of the carburetor. In this case, special attention should be paid to the operation of the power unit at idle. You can check the operation of the engine in idle mode by paying attention to the condition of the circuit immediately after starting the internal combustion engine. If it rotates, then it will be necessary to configure the power unit.

Another reason for this typical malfunction is air leakage. If an air leak occurs in one of the chainsaw mechanisms, the mixture will automatically become leaner, which will lead to a spontaneous increase in the speed of the chainsaw motor. In this case, the operator will need to carefully check the entire fuel system, including the carburetor, pipes, working chambers of the assembly.

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Your Chainsaw Stalls? You Can Fix It, Here’s How

In some cases, the chainsaw does not slow down due to a pinched accelerator cable. In this case, the power unit will independently gain momentum to the maximum immediately after its start. Dismantling the gas handle and inspecting the entire gas supply mechanism will help solve the problem. A pinched cable will need to be adjusted or completely replaced.

What to do if the chainsaw stalls when you press the gas

One of the most common questions regarding the operation of this device: why does the chainsaw stall when you press the gas and what needs to be done to solve this problem? In such a situation, you must do the following:

  • check the fuel filter;
  • inspect the fuel hoses for tightness;
  • check the muffler;
  • try to increase the speed a little;
  • check the condition of the rubber seals on the crankshaft.

Why does it stall at idle

The first and most common cause of this malfunction is incorrect carburetor adjustment. There is an option to adjust the idle speed without the help of others, for this purpose you need to have a STIHL adjusting screwdriver, which is supplied with the unit. The adjustment hole is located on the right side of the STIHL 180 saw on the handle and is marked with “-” and “”.

If the STIHL chainsaw does not keep speed and stalls at idle, of course, in fact, it is 90% certain that it has a malfunction in the fuel pump operation system, usually this is air leakage into the crankcase through the pan gasket, or, much more often, through the crankshaft oil seals. Air leakage reduces or completely stops the impulse that is supplied through special channels to the fuel pump of the chainsaw. Upon completion of this, the STIHL 180 chainsaw does not receive the required amount of fuel and stalls at idle.

Diagnostics can be carried out using a special device called a vacuum gauge.

The 2nd method to check the performance of the oil seals is to pour gasoline into the crankcase of the engine and look at them, if the oil seals let gas through, it means they are to provide normal pressure in the crankcase, which will make idling unfeasible. And while working at high speeds, with leaky oil seals, there is a possibility of jamming of the crankshaft bearings.

Method for checking the crankcase and STIHL oil seals

  • Removing the top cover.
  • Remove the air filter housing and carburetor.
  • Removing the chainsaw handle.
  • Split and removes the starter.
  • From the back of the starter side removed the side cover and the leading asterisk.
  • A piston stopper is installed in the candle hole; otherwise, a cord from an old starter with knots imposed on it is stuffed into the cylinder.
  • The flywheel and clutch are unscrewed, then the parts are removed. It is worth knowing that the chainsaw clutch has a left-hand thread and unscrews clockwise.
  • Removing the oil pump drive gear.
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Having disassembled the STIHL MS 180 chainsaw, you can meet oil seals, after which you need to fill the crankcase with gasoline and check for leakage. Fill the crankcase, there is an option through the fuel window in the cylinder, for this purpose the piston must be raised very high. If leaks are found, you need to change the defective seals, or re-sealing the pan. There is an option to assemble STIHL 180 following the reverse sequence of the method.

A chainsaw has long been not a luxury, but a necessary tool for anyone who has at least some suburban area. Why does the chainsaw stall under load chainsaw machine stalls at idle. With its help, you can perform garden work, harvesting firewood, finalizing lumber and much more. There are many models of chainsaws on sale, differing both in power and in overall quality of performance. You can see this here. E-Katalog.Ru.

But no matter what technique can be capricious, and chainsaws are no exception. Let’s look at more relevant tasks.

Why does the chainsaw engine stall when you press the gas

Despite the high performance of chainsaws, sometimes there are moments when the tool stops working normally. In particular, a common situation is the fact that the chainsaw starts to stall when you press the gas. For experienced tool owners, this problem is known, but for beginners who have encountered this for the first time, they will have to seek help from specialists. But do not rush, in the material you can find all the important causes of the malfunction, and also try to eliminate them.

Substandard carburetor operation

If it turns out empirically: the filters are clean and the ignition system is not to blame for the fact that the chainsaw is not able to operate at idle, the owner of the tool is recommended to switch his attention to the carburetor.

It is necessary to disassemble and assemble the carburetor without haste, as it contains many parts without which it cannot work.

Often, misalignment of this unit, which is responsible for supplying a certain volume of air-fuel mixture to the engine cylinder, leads to unstable operation. You can adjust it with three special screws located on the carburetor: the screws for maximum and minimum speed, as well as a screw that controls idle speed.

Some manufacturers, fearing unwanted interference from incompetent people, supply their products with only one idle screw. But in both cases, the carburetor adjustment can be made only by strictly following all the manufacturer’s instructions.

However, even after adjusting the carburetor, in accordance with factory standards, this unit may junk. Then it is recommended to clean the fuel and air channels, jets, filter element mesh. If the membrane is damaged, it must be replaced with a new and high-quality one.

When servicing and repairing a carburetor, you should always remember that it is usually crammed with many very small parts, without which the device simply cannot work normally. Therefore, disassemble and assemble the carburetor without haste and with special care.

What to do if the chainsaw stalls at high speeds?

Even with a strong desire, a chainsaw cannot be classified as a complex device. And we also note: the simplicity of the design is its characteristic feature. However, despite this fact, even such a simple device breaks down, taking a considerable amount of time to repair.

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The difficulty is not the repair procedure itself, but the correct determination of damage. One and the same breakdown cause completely different disadvantages. Therefore, it is not worth rushing to immediately disassemble the engine or the carburetor before the signs of breakdown are examined. Instructions for use and repair chainsaws can little here than useful, you will have to connect your own mind anymore.

Existing breakdown options can be attributed to one of two categories: damage to the engine system with numerous groups and nodes in it (ignition, fuel supply, exhaust, cylindro-piston) and breakage of other nodes (lubrication system, brake, tire, clutch coupling, dr.).

Non-fixed work carburetor

If it turns out empirically: the filters are clean and the ignition system is not to blame for the fact that the chainsaw is not able to operate at idle, the owner of the tool is recommended to switch his attention to the carburetor.

It is necessary to disassemble and assemble the carburetor without haste, as it contains many parts without which it cannot work.

Often, misalignment of this unit, which is responsible for supplying a certain volume of air-fuel mixture to the engine cylinder, leads to unstable operation. You can adjust it with three special screws located on the carburetor: the screws for maximum and minimum speed, as well as a screw that controls idle speed.

Some manufacturers, fearing unwanted interference from incompetent people, supply their products with only one idle screw. But in both cases, the carburetor adjustment can be made only by strictly following all the manufacturer’s instructions.

chainsaw, stalls, idle

However, even after adjusting the carburetor, in accordance with factory standards, this unit may junk. Then it is recommended to clean the fuel and air channels, jets, filter element mesh. If the membrane is damaged, it must be replaced with a new and high-quality one.

When servicing and repairing a carburetor, you should always remember that it is usually crammed with many very small parts, without which the device simply cannot work normally. Therefore, disassemble and assemble the carburetor without haste and with special care.