STIHL 180 is pressed on the throttle

STIHL 180 chain saw Starts up and stops Cause

A chainsaw has long been a luxury, and necessary equipment for those who have a summer cottage or house ownership. However, just like no other equipment, this tool tends to fail, in spite of the uncomplicated device.

The systematization of the main defects means:

  • complete absence of starting the motor
  • The engine starts and stops
  • Unbalanced operation of the tool
  • Stoppage of work under load
  • loss of power.

If the chainsaw does not start completely, the reason you will like more in the following:

  • Production faults
  • Lack of fuel
  • Trouble starting the ignition system
  • No spark from the spark plugs
  • Bad fuel mixture
  • Clogged carburetor
  • Problems with high-voltage wire
  • No compression.

Why does the chainsaw starts and stops, what to do under such circumstances? It is necessary to carefully examine the prerequisites for this purpose.

Chainsaw starts and stops: cause, video

The reason that a chainsaw can stall right after starting is due to a problem with a certain piece of equipment.

Why a chainsaw doesn’t start well and stalls

If the machine does not start well when cold, the problem may be a lack of compression, i.e.е. The rings are worn out from long periods of use and need to be replaced. Sometimes a problem with the muffler or poor contact between the spark plug and the wire is the reason why the engine does not start well when not warmed up.

READ STIHL chain saw does not rev up

Also causes for poor starting may be wear or damage to the gasket, rubber collar in the booster pump of the carburetor, which causes additional air flow, resulting in higher saw speeds.


Correct usage of the machine, with periodic inspection of components to prevent damage. To troubleshoot the problem, you need to check all the components of the equipment to make sure they are functioning.

If the chainsaw starts up and stalls, the cause can be eliminated by your own efforts. If it is a shortage or improperly prepared fuel mixture, you need to fix it. To be on the safe side, always drain off the fuel when the chain saw is not in use.

Replacement throttle spring accelerator and carburetor cleaning Stihl Ms 180

Check the spark plugs periodically. This should be done by removing the soot that clogs the joint gap and checking the tips for fuel. Gasoline soaking the spark plugs is another reason for malfunctions. To do this, take it off, wipe it down with a rag and leave it to dry. Faulty spark plugs must be replaced.

STIHL chain saw starts and stops because.

If there is no spark between the spark plug and the high-voltage wire, but if they are well connected, the ignition unit should be replaced.

READ STIHL chain saw does not rev up under load

Clogged mufflers are a very common cause of muffler failure chain saw

Starts and stops right away. To fix the problem, you need to dismantle the muffler, clean it from soot with sandpaper or a special chemical solution. If the chainsaw model is not dismantled, chemicals are poured into the system and stay there for several hours, then it is blown out.

The carburetor must be adjusted if the chainsaw

The saw stalls at idle speed. Fine-tuning is quite a time-consuming process, so it is usually performed in service centers. But, on some models there are elements for its adjustment, it is enough to turn the bolt by half a turn to increase the revolutions of the chainsaw, the problems will be eliminated. If the jets, injectors, channels and filters are clogged, the whole carburetor must be disassembled and cleaned. If the seals, gaskets, sealing collars are worn out, they must be replaced to prevent air drainage.

If there are problems with the fuel or air filter, the fuel pump must be replaced or the air filter cleaned.

If the breather is clogged, it is necessary to clean it with an ordinary needle.

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When the chainsaw starts and immediately stops, the reason may lie in the improper operation of the chain. To eliminate problems, check the presence of oil in the container for chain lubrication, as well as the oil drain tube for breaks or clogs.

STIHL 180 starts and stops with reason.

When inspecting the piston group pay attention to the cylinder and replace it or the piston if necessary. You can make a boring of the cylinder for the size of a new piston. If the piston and cylinder are normal, you should pay attention to piston ring defects and the need to replace them.

Check the oil life of all the components listed in the instruction manual, such as drive sprocket, guide bar, chain and anti-vibration system components and change them in good time.

Check the fuel line if the machine has not been used for a longer period. If the tube is cracked, you must replace it with a new one.

How to start the chainsaw Ural without a starter

To start the chainsaw you need to give the flywheel a torque. Several successful ways of doing it have been worked out.

  • Unscrew the ratchet from the flywheel and screw in its place. Use nuts to fasten the pulley to it. A cord is wound around a pulley and the engine is started by jerking the cord, like a tractor starter motor of Soviet times.
  • A bolt screwed into the flywheel is turned by a socket head fixed in an electric drill.

This heavy and gasoline-hungry saw was an industrial sawmill. At home it is good for sawing thick trunks into tree stumps. The opinion that it is reliable and unpretentious is a myth. Every 50 hours it requires a thorough service, every 100 hours it requires an even more thorough service. This can be found in detail in the Operating Instructions of the Ural 2T Electron chainsaw (link leads to the catalog with instructions).

Ural” chain saws have been known for more than half a century: their production began in 1955 at the Perm factory, which for many years worked for the country’s military-industrial complex. Their popularity has not waned to this day: demand is still high, despite the plethora of new foreign brands. Some do not want to overpay: the purchase of a chainsaw “Ural” is more budget-friendly than similar devices from leading European manufacturers. The same goes for their maintenance and repair, which can save the family budget.

But most of the users of these chainsaws appreciate the traditional quality, which has been proven by decades of service of more than one generation of people.

With the features of the legendary saws of this manufacturer, their structure and functionality, as well as the nuances of service and repair we will get acquainted in this article.

STIHL chain saw stalls at high rpm

Chainsaw stalls at idle speed: this is the problem faced probably by owners of the tool. By its own design, the saw is a fairly light tool. However, there are cases when it breaks down. The main problem in troubleshooting is determining the correct cause of abnormal operation. After determining the cause, correcting the defect is usually quite simple.

Probable causes of failure

All chainsaws are powered by a single-cylinder internal combustion engine. This type of device is characterized by such malfunctions as a violation of intra-cylinder compression, changes in the ratio of the fuel mixture, incorrect ignition operation, poor-quality fuel and lubricants. The main problems in the operation of the power unit are as follows:

  • The engine runs steadily at minimum rpm, but it throttles when the rpm is increased;
  • Starting is normal, but the idle speed is unstable, and quickly stalls;
  • Won’t start.

Chainsaw electronic ignition diagram.

Abnormal idling can be caused by various reasons. There are a number of different causes:

STIHL STIHL 180 chain saw starts and stops.

  • The capacity of the filters (gasoline and air) is reduced;
  • The ignition system is malfunctioning:
  • The carburetor settings have spontaneously changed;
  • Faulty gasoline line components;
  • Exhaust passages and muffler are clogged;
  • Defects of the piston, cylinder, valves.

Repair should begin with an external inspection and check the presence of fuel in the tank.

Checking and repairing the filters

The engine may malfunction or stall if there is insufficient fuel or air. Causes. clogged air or fuel filter. To check the fuel filter, remove the fuel line hose from the carburetor hose fitting and place it in a container. Then press several times to prime the fuel. If fuel is pumped normally, in well-defined doses, without dirt, then the fuel filter is serviceable. If the jet is weak or the fuel is not pumped at all. filter must be replaced or if possible cleaned.

READ What Chain Oil for a Chainsaw

Sawdust clogging the fuel filter is one of the causes of chainsaw failure.

stihl, pressed, throttle

Remove the machine from the fuel tank (first drain off all the fuel). The fuel filter on most models can be pulled out through the neck with a wire hook. If the filter is collapsible and can be cleaned, it needs to be disassembled and washed according to the manufacturer’s instructions. Otherwise, change to a new filter.

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STIHL 180 chain saw cuts out at idle speed.

Similar problems can occur if the air filter is clogged with dust, sawdust, dirt. Insufficient air flow makes the fuel mix richer and makes combustion more difficult.

Fuel filter must be removed for inspection. Always take precautions when working so dust does not enter the carburetor. The device should be cleaned and rinsed in warm water with detergent added. After drying with compressed air at low pressure if possible, replace the spark plug. If the chain saw keeps working correctly the problem is solved. if not, keep looking.

If you use your machine all the time, it is a good idea to change the fuel and air filter every 3 months.

STIHL MS 180 repair / carburetor disassembly and assembly / cuts out at idle

STIHL MS 1800 chain saw. The problem is solved correctly if the chain saw stops and the spark plug goes off.

Check spark plugs and ignition system

According to the recommendations of the manufacturers spark plug should be changed annually, regardless of the intensity of operation of the tool. Failure to follow these tips leads to a very natural result: malfunctions on the at idle rpm

The following are typical defects in the ignition system

STIHL 180 chain saw stalls at idle.

  • The spark plug is flooded with fuel at startup. It is necessary to remove it from the socket, dry it and if possible blow it out with compressed air. Drain residual fuel from the cylinder through the fitting hole, blow out with compressed air. Then install the spark plug, reconnect the ignition cable, start the engine.
  • No spark on spark plug electrodes. Disconnect the high-voltage cable and check the spark plug. If the spark is normal, check the connection, fix the detected defects. No spark on ignition cable indicates ignition unit malfunction. This device is not repairable, need to be replaced with a new one.
  • The gap between the electrodes of the spark plug is broken. This parameter can be between 0.2 and 0.5 mm for different types of units. Check and correct with special probe or caliper. To find out the necessary value, consult the instruction manual of the tool.
  • By the appearance of the plug you can determine the direction of the search. If the spark plug is dry after several attempts to start the engine, it means that there is no gasoline in the cylinder. Check the fuel system and carburettor.
  • If black soot or soot deposits on the electrodes indicate improper carburetor adjustment or a clogged air filter. Probably low-quality fuel with too much oil is used. If ignition system is normal, electrodes have uniform gray color and brown deposits on insulators.

READ What Oil to Add to Gasoline for Gasoline Saw

STIHL chain saw cuts out at idle speed.

If checking the ignition system, fuel filters, muffler did not give tangible results, the tool still does not want to work properly at minimum rpm, you need to check the carburetor.

There are three screws on the body of the device to adjust the modes of operation, designed to set the minimum speed, maximum rpm and idle speed.

On many models, manufacturers install only the idle adjustment screw to avoid incompetent attempts to adjust the device. In all variants of the device adjustment should be performed exactly according to the recommendations of the manufacturers.

If adjusting the unit does not restore normal operation, you should disassemble the unit and inspect it completely. It should be understood that the carburetor is quite a complex device, in the absence of experience, it is advisable to consult specialists.

When disassembling it is important to carefully inspect and wash all nozzles, air and fuel channels, the filter screen. Damaged elements must be replaced with new ones. The jets should be cleaned with a soft wire of appropriate diameter.

It is desirable to perform the work in proper conditions. The carburetor contains many small parts; loss of any one of them will render the unit inoperable.

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Checking and repairing the muffler

Clogged mufflers should be left to soak in warm water and detergent, then thoroughly wiped and dried.

A defective muffler causes the tool to operate with less power and stops at idle speed. Despite the apparent simplicity of this part, it is also important to keep an eye on it. Quite often the muffler becomes clogged. Dust, sawdust, resin chips and other contaminants could get on the wire guard. Exhaust gases also form deposits on the surfaces of the spark arrester and other parts. A layer that grows over time reduces the capacity of the muffler and interferes with the normal removal of exhaust gases. Figuratively speaking, the engine suffocates.

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Repair of this unit is not complicated, it is quite on the power of many owners of the tool. Remove the unit from the engine and cover the holes with a rag or other material. If the layer formed is too hard, all parts can be left to soak in warm water and detergent. After softening the deposit the parts should be washed with a rag or soft brush and thoroughly wiped. Inaccessible areas can be blown out with compressed air or dried with a hair dryer. The use of mechanical means of removal is undesirable.

To keep the muffler working properly for a long time, you should use a lubricant recommended by the muffler manufacturer and check its expiration date. The fuel mixture should be prepared just before you start work and used up completely.


Chainsaws, like most tools, need care and maintenance.


You ask what the first thing is? The answer is the muffler. The silencer is responsible for the exhaust gases and suppressing the flames in them. All combustion gases pass through it and can eventually clog it. The situation with a clogged muffler is not unusual, but occurs due to improper fuel mixture.

If the ratio of gasoline to oil is normal, the combustion products are not saturated with enough soot to clog the muffler. If the amount of oil is greater than usual when it burns, excessive carbon deposits are formed. In addition, sludge builds up under the piston rings and in the muffler of the Calm 180 chainsaw. So smoked muffler, the most harmless thing that can happen, the maximum damage from excessive carbon emissions is the need to replace the piston.

STIHL 180 carburetor design

The STIHL ms 180 is designed by our subsidiary STIHL and is made under the name of Zama. Original carburetors, on their cases, have the company’s logo to guarantee the quality of the product.

Fuel pump

There is a fuel pump directly in the carburetor housing, which operates under the influence of the air pulse from the chainsaw crankcase, which is transmitted through special channels. There is a diaphragm in the pump and it is the diaphragm that is responsible for pumping the fuel under the impulse. Between the diaphragm and the body there is a gasket, which is responsible for sealing the fuel pump.

distribution chamber

The distribution chamber, as well as the fuel pump, also has a diaphragm, which opens and regulates the fuel supply by pushing on a special rocker arm that lifts its needle valve.

lid of the chamber, is the compensator housing, which is attached to the carburetor with four screws, between the housing and the cover is installed gasket, which increases the height of the chamber and is responsible for sealing.


The fuel injector is built into the carburettor body in such a way that it serves as a connecting link between the distribution chamber and the throttle chamber. Simultaneously with the fuel, air is fed to the nozzle and an air mixture is formed. The nozzle has a check valve that blocks the flow of air in reverse, i.e. from the throttle chamber to the distribution chamber.

Throttle valve

The throttle valve is installed in the carburetor body and is responsible for increasing the flow of fuel mixture directly into the engine cylinder. When the throttle is depressed, the choke opens slightly, thereby increasing the flow capacity and allowing more fuel to rush from the carburettor cavity into the cylinder.

Combustion of a greater volume of fuel increases the amount of energy produced, which affects the power and speed of the processes. The choke is mounted on a shaft passing through the entire carburettor body. On the shaft outlet from the housing, there is a mount for the throttle cable and next to it is a cone-shaped adjustment screw, which is responsible for adjusting the idle speed. By screwing the screw you can slightly adjust the position of the shaft and the choke attached to it and thus increase or decrease the idling speed by opening or closing the choke.

Air damper

The choke of the carburetor is installed on the opposite side from the throttle and is responsible for starting a cold engine, it is controlled by the engine control lever. For a cold start the air damper is completely closed, for normal operation the air damper is opened.

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