The Chainsaw Does Not Start Well When Cold

At full speed

Sometimes the engine will stall after normal operation. To establish the cause, pay attention to the accompanying circumstances:

  • Motor stalls in the middle of work for no apparent reason. The starter is stationary and does NOT turn. It means that the tool is jammed and requires urgent repair.
  • During normal operation, the power is reduced for a short time and the engine stops, the cylinders are overheated. The situation indicates the occurrence of an air suction under the rubber pipe between the carburetor cylinder, possibly due to a rupture. Air depletes fuel, nozzle replacement required.

Determine the availability of fuel and its supply.

First you need to make sure that there is a fuel mixture in the tank of a chainsaw that does not want to start, and it regularly enters the carburetor. With a full tank, we check how the mixture is fed through the gas line. Disconnecting the fuel system pipe from the carburetor and trying to pump up. In the case of a complete order, when pumping, gasoline will be supplied in a jerk in accordance with the norms set by the manufacturer. Poor or no fuel supply can result from:

  • The fuel supply channel is clogged;
  • Debris-killed fuel filter.

Often a prerequisite for a poor start of a chainsaw can be a tank that is too full. In this case, pay attention to the presence of smudges under the saw case cover. If present, see the connection of the gasoline feed pipe to the carburetor. Most often, it is squeezed out by pressure when the tank cap is screwed on, refueling under the very neck, which prevents the engine from starting.

The quality of the fuel mixture can also be one of the reasons why the chainsaw does not start. If, after completing the work, DO NOT drain the remaining gasoline, and leave the tool for long-term storage (more than 2 weeks), then the processes of gum formation and polymerization of the components will begin to occur inside the tank. What can be a prerequisite for the appearance of carbon deposits on the piston, rings and cylinder liner. Therefore, always prepare the mixture only in the required amount before work.

Idle speed adjustment

Before adjustment, the tool is maintained. In order for the idle speed adjustment to be effective, prevention is done:

  • Carburetor cleaning;
  • Flushing the engine;
  • Air filter cleaning;
  • Warming up the engine.

To adjust the operation of the mechanism at idle speed, use the Corresponding adjusting screw. Its rotation depends on the required setting:

  • With standard adjustment, the screw is turned against the clock hand to the point where it will turn tightly. After that, make 2 circles in the direction of the arrow.
  • If the saw is running at low speed, turn the screw clockwise until the chain starts moving. Then make half a circle in the opposite direction.
  • At high frequency, the regulator is turned against the clock hand until the circuit stops. After that, the rotation is continued for another half turn in the same direction.

It will NOT work to adjust the idle operation if there is an air leak into the engine through the acceleration gasket, oil seals or for another reason.

Stihl chainsaw stalls: reasons

If the tool turns off immediately after starting, it means that a breakdown of some device or part has occurred. To determine the reason, the mechanism is tested independently or in service workshops. Sometimes the premise that the mechanism does not start well is improper saw maintenance:

  • There is not enough gasoline;
  • Poorly prepared fuel mixture;
  • Poor lubricant quality;
  • Silencer clogged with combustion products;
  • Unadjusted carburetor;
  • Obstruction of the air filter;
  • Malfunctioning piston or cylinder.

The Chainsaw Does Not Start Well When Cold

Idle

Violation of the functionality of the fuel unit system leads to air leakage. In this case, the unit stalls at idle and does NOT keep their number. Additional suction Reduces air impulse to the fuel pump and passes through the pan membrane or crankshaft oil seals. Diagnostics is done with a vacuum gauge.

The termination of engine cold operation occurs for other reasons:

  • The candle channel contains an excess amount of the combustible mixture;
  • The gap between the spark plug tip and the high-voltage cradle is NOT adjusted;
  • Power supply failure.

They check the oil seals, pour gasoline into the crankcase, the leak is visible visually. This means that the engine does not idle, and at a high frequency, leaking oil seals will lead to seizure of the bearings. In case of leakage of elements, they are replaced with new ones and they are sealed.

What to do if the chainsaw continues to start?

If the initial inspection did not give anything or the defects were eliminated during the search, and the chainsaw does not start further, then you need to look for more serious reasons. It is best to identify and eliminate such breakdowns in a service center. However, with experience, you can find and eliminate them yourself. What to diagnose and check?

  • Compression in the cylinder;
  • Compression in the crankcase;
  • Carburetor operation.

In the first case, checking the compression in the cylinder will make it possible to find out the state of the cylinder-piston group (CPG) of the chainsaw of those who DO NOT WISH to start cold. For this you need a compressometer. The device is screwed into place of the spark plug and the engine is idle. The measurement shown allows you to judge the state of the CPG. In the absence of a compressor, the compression in the cylinder can be determined offhand as follows:

  • Place your finger on the candle hole;
  • Try to start the chainsaw engine.

Put your finger on the spark plug hole and pulling the starter, you can check the compression in the cylinder

If you feel that your finger is pulling strongly into the candle channel, then the compression is all right. The absence of vacuum in the chamber indicates a malfunction. The cylinder-piston group needs a more detailed inspection, which will give an idea of ​​the condition of the piston and cylinder, piston rings and bearings.

The chainsaw may not start on a cold one due to the lack of compression in the engine crankcase. The main prerequisite for this is damage to the gasket placed between the cylinder and the crankcase. It is quite easy to detect the lack of compression:

  • Disconnecting the top tube from the carburetor;
  • Pour gasoline into an ordinary cork;
  • By immersing the removed tube in the fuel;
  • Tugging the starter several times.

If the fuel from the cap is sucked in when starting the chainsaw starter, then everything is in order with the compression. If not, see the gasket.

If the fuel is drawn in, then everything is in Pryadko. the gasket is intact. Otherwise, you will have to purchase a repair kit and replace it. See how to do it. Why the Chinese chainsaw won’t start:

Starting the tool can be complicated by improper operation of the carburetor or its breakdown. It often happens that during the sawing process the fastening screws loosen and air is sucked into the cylinder. Check that the carburetor is securely attached. Inspect it for fuel leaks. There can be a lot of reasons for the malfunction. It is possible to pinpoint the malfunction, eliminate it and fine-tune the carburetor only in a service center.

After going through the step-by-step troubleshooting of the chainsaw engine, you can find the malfunction, fix it yourself and successfully start your working tool. DO NOT take on jobs that you are NOT confident in. Trust the troubleshooting to specialists from the service center.

The lightweight and compact model of the tool is used for domestic purposes, but, despite the optimized performance, sometimes the Stihl chainsaw does not start. Problems are manifested in the fact that the engine turns on and stalls, is unstable, it can not develop the required power or suddenly picks up high revs.

Does NOT slow down

The tool quickly reaches maximum RPM and power does NOT decrease. This situation is explained by the fact that:

  • The throttle valve does not work due to a weakening of the spring or traction element;
  • The on toggle switch periodically fails;
  • There is a corkscrew on the throttle shaft;
  • Clogged carburetor;
  • The fuel hose and the gasoline filter are not functioning correctly.

Chainsaw outlet check.

One of the reasons that a chainsaw does not start well may be a clogged exhaust channel or its muffler. At the same time, a drop in power is noted in the process of sawing lumber and logs. Most often this occurs due to resinous deposits on the spark arrestor or muffler channel, which are formed during the combustion of a poor-quality mixture of gasoline and oil, which impede the removal of exhaust gases.

A resonator clogged with carbon deposits can cause a poor start of a gasoline saw.

Eliminate the cause of the poor start of the chainsaw, in this case, you can remove the accumulated combustion products. To do this, we will perform a number of manipulations:

  • Remove the muffler by unscrewing the screws;
  • Remove the cooling panel and gasket;
  • Remove spark arresters;
  • Let’s disassemble the resonator body;
  • Wash all elements from carbon deposits with detergent;
  • Let them dry completely;
  • Collect everything in reverse order;

Fuel supply

After unscrewing the candle, a wet bloom is found on its surface. This indicates an excessive supply of gasoline to the combustion chamber. For this reason, the tool does not work or stalls, since the fuel does NOT ignite.

The second inhibiting factor is the clogging of the breather. a small hole in the lid of the gasoline tank. It is cleaned with a needle, otherwise the Stihl MS 180 chainsaw will not start. To determine the incorrect fuel supply, follow the sequence:

  • Remove the candle;
  • 2 cubes of gasoline are poured into the hole of the candle with a syringe;
  • Put the ignition device in place and put on the cap of the high-voltage wire;
  • The lever is moved to the hot start position;
  • Pull the starter handle a couple of times.

If the tool starts up and immediately stalls, then the fuel line is tested further. Check the gasoline filter, splash from the engine crankcase, the integrity of the septum in the pump when unscrewing the cover.

Chainsaw Won’t start hot

In cases where the chainsaw does not start hot, it is necessary to conduct a visual inspection of all the main units of the chainsaw. Inspection should start with the spark plug. Check the spark, inspect the spark plug electrode surface, these steps will help establish the direction in which to look for the problem.

Fuel system problems

If, upon inspection, it was found that there is a spark, and the plug is dry, then there are problems in the fuel system. Checking it should begin with the fuel filter. Next, you need to inspect the fuel hose and its attachment to the carburetor, pay attention to fuel leakage from the carburetor and the presence of gasoline in the air filter housing. It is advisable to start removing the carburetor only if visual inspection did NOT allow determining the cause of the breakdown.

A common symptom of a problem in the fuel system is excess fuel in the engine cylinder. Typically, this is indicated by an overly wet spark plug and the presence of a spark at the plug contacts. In this situation, it is necessary to turn the chainsaw over so that the candle hole is directed downward. If, at the same time, gasoline flows out of the cylinder, then the reason that the chainsaw starts is overflowing fuel into the engine.

The process of adjusting the carburetor can be found on the example of the Champion 254 saw, by looking at the instructions.

Spark plug

The spark plug is one of the main elements of the ignition system. A spark is formed on its electrodes, and if this element fails, it will be difficult to start, or it is NOT possible at all.

The spark plug can fail completely, either work intermittently or give out a weak spark. It is quite simple to check the spark plug, for this you need to Unscrew it from the engine, attach it to the high-voltage wire caps and, putting it on the cylinder, pull the starter. If the candle is in order, the spark will be powerful with a bluish tinge. A faint spark with a reddish tint indicates a problem. The defective plug must be replaced.

Malfunctions in the ignition system

If, when inspecting the spark plug, it is found that it is wet and sparking on the contacts does not occur, this means that the problem should be looked for in the ignition system, inspect the coil, check the gap between the flywheel and the coil contacts. You can also check how tightly the cap of the high-voltage wire sits on the candle, and the candle itself. Try to replace it with a new one.

Fuel and air filter

Contamination of the main filter elements of the chainsaw, negatively affects its operation.

For example, a dirty air filter will not fully supply air to the carburetor, which will affect the quality of the air-fuel mixture and normal engine starting. Contamination of the fuel filter will make it difficult or even cut off the supply of gas to the carburetor and make the engine impossible to operate.

Carburetor adjustment

NOT correct carburetor adjustment will be a prerequisite for the chainsaw to develop at full power. It will not start well, or will not start at all. The carburetor setting directly affects the quality of the air-fuel mixture, which is necessary for normal starting and further engine operation.

An excess of gasoline in the mixture is called overflow. A characteristic sign of overflow is a wet spark plug, after several unsuccessful attempts to start the chainsaw.

Reduced compression

One of the frequent cases of difficult starting of a chainsaw is wear of the CPG (cylinder-piston group).

As you know, for the normal start of a chainsaw, compression must be present in its engine. It is necessary for the normal compression of the fuel mixture in the engine cylinder, it also affects the operation of the gas pump.

The reasons for the absence of compression, or its reduction, may be natural, because. The engine wears out during operation. Also, problems can be caused by a serious breakdown, for example, a seizure of the CPG, or a broken piston ring.

A sign of reduced compression is a weak resistance of the starter when starting. With reduced compression, a decrease in the power of the chainsaw is observed, which negatively affects its performance. The problem is eliminated by replacing the piston rings, or completely by the CPG.

The chainsaw does not start well when cold

Fuel problems

As with the difficult hot start option, problems in the fuel system can affect a cold start or inability to start. Adjustment of the carburetor, contamination of the fuel filter and the line, all these are the reasons that cause difficulties when starting.

Diagnose the fuel system, this is the first thing you need if it is difficult to start on a cold.

It is worth paying attention to the quality of the fuel, because When using a mixture of gasoline and oil, in which there is a small amount of water, starting can be significantly difficult or impossible.

The reasons why the chainsaw starts and stalls

A chainsaw has long been NOT a luxury, but a necessary tool for those who have a summer cottage or home ownership. But, like any other technique, this tool tends to fail, despite the simple device.

The classification of the main faults includes:

  • Complete absence of engine plant
  • Engine starts and stalls
  • Unstable tool performance
  • Stop under load
  • Loss of power.

If the chainsaw does not start at all, the reason may be:

  • Manufacturing defect
  • Lack of fuel
  • Problems with starting the ignition system
  • No spark from spark plugs
  • Poor fuel mixture
  • Carburetor clogged
  • High voltage wire problems
  • No compression.

Why does the chainsaw start and stall, what to do in this case? The reasons for this need to be considered in detail.

Why the chainsaw does not start well and stalls

With a poor start of the equipment “to cold” the problem may be in the absence of compression, ie. The rings are worn out due to a long service life, they need to be replaced. Sometimes a problem with the muffler, as well as poor contact between the spark plug and the manual, is a prerequisite for the engine to start poorly in the not very warm state.

Also, the reasons for a poor start can be wear or damage to the gasket, the rubber cuff in the accelerator pump of the carburetor, which causes additional air flow, leading to an increase in saw speed.

The chainsaw starts and stalls: the reason,

  • The most commonplace reason for why the chainsaw started up and stalled may be the low fuel level in the tank. This can be confirmed by stopping the operation of the tool when tilting, when fuel residues accumulate in a certain place in the fuel tank. With poor fuel, there may also be a problem with the operation of the chainsaw, in which case you need to completely replace it.
  • Clogged breather, which significantly reduces fuel consumption to the engine.
  • The contact of the wire cap with the candle is insufficient, which leads to strong heating of the spark plug insulator. Deterioration of contact may be due to mechanical shear or carbon deposits.
  • Broken spark plugs.
  • Clogged muffler, which leads to poor exhaust gas output, leading to engine shutdown. For this reason, the chainsaw can start and stall at idle speed. Sediment in the muffler can also appear due to poor-quality fuel or improper operation of the tool.
  • Poor carburetor adjustment.
  • Breakage of the piston group
  • Fuel filter or pump problems. In this case, gasoline may flow through the pump or poorly flow through the fuel filter to the carburetor. In total, the chainsaw starts up and stalls when the speed increases.
  • Dirty air filter. Problems with this piece of equipment lead to the fact that with increased engine loads, it simply cannot cope with them due to blockage and stops. A similar result is also obtained with an increase in revolutions.
  • Short circuit due to lack of or insufficient lubrication, or a problem with the chain brake.

Troubleshooting

The operation of the equipment must be correct, with periodic inspection of the constituent elements to prevent damage. To troubleshoot, it is necessary to check all components of the equipment for their functioning.

If the chainsaw starts and stalls, the cause can be eliminated on your own. If it is a shortage or improperly prepared fuel mixture, it is necessary to correct it. For prophylaxis during the idle time of the chainsaw, you should always drain the remaining fuel.

The spark plugs should be checked periodically. In this case, remove carbon deposits that clog the joint gap, and also check the tips for the presence of fuel. Another prerequisite for problems with spark plugs can be wetting with gasoline. To do this, they need to be removed, wiped off with a rag and left to dry. Defective spark plugs are replaced.

If there is no spark between the spark plug and the high-voltage wire, but if there is a good connection, the ignition unit must be replaced.

A clogged muffler is a common prerequisite for breakdowns, in which the chainsaw starts up and immediately stalls. To eliminate the malfunction, you need to dismantle the muffler, clean it from carbon deposits with sandpaper or a special chemical solution. If the model of the chainsaw is non-separable, chemicals are poured into the system and are there for several hours, then it is blown.

The carburetor must be adjusted if the chainsaw stalls at idle speed. Fine tuning is a rather laborious process, so it is usually done in service centers. But, on some models there are elements for adjusting it, it is enough to return the bolt half a turn to increase the speed of the chainsaw, the problems will be eliminated. If the jets, nozzles, channels and filters are clogged, it is necessary to disassemble and clean the entire carburetor. When oil seals, gaskets, cuffs are worn out, it is necessary to replace them, preventing air leakage.

If there is a problem with the fuel or air filter, replace the fuel pump or clean the air filter.

If the breather is blocked, it must be cleaned with a regular needle.

When the chainsaw starts up and immediately stalls, the reason may lie in the malfunctioning of the chain. To troubleshoot problems, check the presence of oil in the chain lubrication container, as well as the oil return pipe for breaks or blockages.

When inspecting the piston group, pay attention to the cylinder, if necessary replace it or the piston. The cylinder can be bored to fit the new piston. If the piston with the cylinder is normal, pay attention to the defects of the piston rings and the need to replace them.

Among other things, you should control the service life of the parts specified in the product passport, which include the drive sprocket, tire, chain, part of the anti-vibration system, and replace them in time.

If the tool is idle for a long time, it is worth checking the condition of the fuel line. If the tube is cracked, you will have to replace it with a new one.