Husqvarna Chainsaw Stalls At Idle

The chainsaw starts and stalls. Why?

The chainsaw starts and stalls There are several simple rules for the operation and maintenance of the chainsaw, the observance of which will maximize its service life. Preparing the correct fuel mixture, regularly cleaning filters and periodically replacing parts will save you from having to repair your tool for a long time. If it was not possible to avoid the breakdown, then you can figure out its cause completely independently. This concerns

Chainsaw stalls when tilted

When the chainsaw is horizontal, the fuel pipe lies at the bottom of the gas tank, but when the tool is tilted, the pipe is above the fuel mixture, i.E. In the air. This is what causes the chainsaw to stall on its side.

There are several simple rules for the operation and maintenance of a chainsaw, the observance of which will maximize its service life. Preparing the correct fuel mixture, regularly cleaning filters and periodically replacing parts will save you from having to repair your tool for a long time. If it was not possible to avoid the breakdown, then you can figure out its cause completely independently. This applies to all brands of chainsaws, from the more complex Husqvarna and Stihl models to the simplest Makita and Patriot models.

Chainsaw stalls under load

If the chainsaw stalls under load, this may be due to the fuel system or a dirty air filter. Replacing the fuel with the correct gasoline / oil ratio or cleaning the air filter are all universal solutions. An improperly prepared mixture of low-quality gasoline and, for example, machine oil is the main reason for the malfunctioning of a chainsaw, including when it heats up and stalls.

Chainsaw stalls at idle speed

Cases are common when the chainsaw stalls at idle. First of all, you need to check the muffler, and, in case of contamination, clean it from exhaust tar deposits. Also on the carburetors of some models, etc., there are bolts with the inscriptions H and L, respectively, rough and fine tuning. By adjusting the bolt L during the operation of the chainsaw in such a way that its speed increases (turn the bolt only half a turn), it is possible to eliminate this problem. Adjusting the carburetor requires an electronic tachometer and is a rather time consuming process. That is why, in such cases, it is better to turn to professionals.

The chainsaw stalls immediately

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 enough, 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, as a rule, is indicated in the data sheet of the chainsaw.

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 candle to a completely new one. The reasons for the tool stalling 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 specialists of the service center.

The chainsaw stalls at high speeds

In the event that the tool stalls at high rpm, there are three parts to check: the air filter, the fuel pump and the gasoline filter. The air filter must be cleaned, you can even wash it under water and dry it thoroughly. Then it is enough to disconnect the fuel hose from the carburetor and see if fuel flows out of it or not. If it flows with a full stream, the petrol filter need not be checked. If, on the contrary, the 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 gas pump is checked for wear: if the fuel does not seep 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 just needs to be replaced with a new one.

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Why the chainsaw does not start well and stalls

With a poor start of the equipment to a cold, the problem may be the lack of compression, i.E. Rings are worn out due to a long service life, they need to be replaced. Sometimes the reason that the engine does not start well in an unheated state is a problem with the muffler, as well as poor contact between the plug and the wire.

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

The chainsaw starts and stalls: the reason

The reason that the chainsaw can stall right after the factory lies in the malfunction of a certain part of the equipment.

The most commonplace reason why the chainsaw started up and stalled could 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 low-quality fuel, there may also be a problem with the operation of the chainsaw, in which case it is necessary to completely replace it.
Clogged breather, which significantly reduces fuel consumption to the engine.
Insufficient contact of the wire cap with the plug, which leads to strong heating of the plug insulator. Contact degradation can occur due to mechanical shear or carbon deposits.
Broken spark plugs.
Clogged muffler, which impairs exhaust gas output, causing the engine to stop running. 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 use 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. As a result, 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 loads on the engine, it simply cannot cope with them due to blockage and stops. A similar result is also obtained with increasing revs.
Chain shortage due to lack or insufficient lubrication, or a problem with the chain brake.

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
The engine starts and stalls
Unstable tool performance
Work 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
Lack of compression.

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

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 must be corrected. For preventive maintenance, when the chainsaw is idle, you should always drain the remaining fuel.

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 cause of spark plug problems can be gasoline getting wet. 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 they are well connected, the ignition unit must be replaced.

A clogged muffler is a common cause of breakdown, in which a chainsaw starts up and immediately stalls. To eliminate the malfunction, you need to dismantle the muffler, clean it from carbon deposits using 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 out.

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 setting it up, just turn 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, the entire carburetor must be disassembled and cleaned. 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, it is necessary to replace the fuel pump or clean the air filter.

If the breather is clogged, clean it 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 tube for breaks or blockages.

When inspecting the piston group, you should 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, you should 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.

Filter check and repair

The engine may run intermittently or stall if there is insufficient fuel or air. Causes of clogged air or fuel filter. To check the fuel filter, it is necessary to remove the fuel line hose from the carburetor fitting and direct it into a container. Then press several times to pump fuel. If the fuel is pumped normally, in clearly defined doses, without dirt, then the fuel filter is in good working order. If the jet is weak or the fuel is not pumped at all, the filter needs to be replaced or, if possible, cleaned.

Clogging of the fuel filter with sawdust is one of the reasons for the breakdown of the chainsaw.

The device must be removed from the fuel tank (after draining all fuel from it). On most models, the fuel filter can be hooked out of the wire through the neck. If the filter design is collapsible and can be cleaned, it must be disassembled and washed in accordance with the manufacturer’s recommendations. Otherwise, change to a new filter.

Similar problems can arise when the air filter is clogged with dust, sawdust, or dirt. With an insufficient amount of air, the fuel mixture will be enriched, the fuel combustion process becomes more difficult.

To check, remove the filter. During operation, precautions must be taken to prevent dust from entering the carburetor. The device must be cleaned and rinsed in warm water with the addition of detergent. After drying, if possible, blow out with compressed air of low pressure, reinstall. If the chainsaw works fine, then the cause has been eliminated, if not, you need to look further.

If the tool is used continuously, it is recommended to replace the filters of the fuel and air systems after 3 months.

Muffler inspection and repair

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

A defective muffler will result in a drop in tool power during operation and idle stops. Despite the seeming simplicity of this detail, it is also important to follow it. Quite often the muffler is clogged. During operation, wood dust, sawdust, resin particles may get on the grate. High temperatures cause them to stick and build up, and exhaust fumes also form deposits on the surfaces of the spark arrester and other parts. The layer that builds up over time reduces the throughput of the muffler and interferes with the normal removal of exhaust gases. The engine, figuratively speaking, suffocates.

Repair of this unit is not difficult, it is quite within the power of many tool owners. Remove the device from the engine and cover the openings with rags or other material. If the formed layer is too hard, all parts can be left to soak in warm water and detergent. After the plaque has softened, the parts should be washed with a rag or soft brush and wiped thoroughly. Inaccessible areas can be blown out with compressed air or dried with a hairdryer. The use of mechanical means of removal is undesirable.

For the normal functioning of the muffler over a long period of operation, use the lubricants recommended by the manufacturer, observing their expiration date. The mixture must be prepared immediately before work and consumed completely.

Checking the spark plug and ignition system

According to the manufacturers’ recommendations, the spark plug should be replaced annually, regardless of the intensity of use of the tool. Failure to follow these tips leads to a completely natural result: failures at idle, subsequent failure.

Typical defects in the ignition system are as follows:

Chainsaw plugs malfunctions.

The candle was flooded with fuel at the time of launch. It is necessary to remove it from the nest, dry it, if possible, blow it out with compressed air. Drain the remaining fuel from the cylinder through the mounting hole, blow it out with compressed air. Then install the candle, connect the high-voltage wire, start.
No spark on the spark plug electrodes. You need to disconnect the high voltage wire and check for a spark on it. If the spark is normal, check the connection, eliminate any defects. The absence of a spark on the high-voltage wire indicates a malfunction of the ignition unit. This device cannot be repaired; it must be replaced with a new one.
The gap between the spark plug electrodes is broken. This parameter for various types of devices can be in the range from 0.2 to 0.5 mm. Checking and adjusting must be carried out using a special dipstick or vernier caliper. The required value can be found in the instruction manual of the tool.
By the appearance of the candle, you can determine the direction of the search. If the spark plug turns out to be dry after several attempts to start the engine, it means that no gasoline is entering the cylinder. The fuel supply system and carburetor must be checked.
The presence of black soot or carbon deposits on the electrodes indicates an incorrect carburetor adjustment or a clogged air filter. Possibly low quality fuel with high oil content. During normal operation of the ignition system, the electrodes are uniform gray and brown on the insulators.

Checking and repairing the carburetor

The principle of operation of the chainsaw carburetor.

If the check of the ignition system, fuel filters, muffler has not yielded tangible results, the tool still does not want to work normally at minimum speed, you need to check the carburetor.

To adjust the operating modes, there are three screws on the device body, designed to set the minimum rotation speed, maximum speed and idle speed.

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

If the adjustment of the device does not lead to the restoration of the normal operation of the tool, it is necessary to completely disassemble the device with an inspection. It should be understood that the carburetor is a rather complex device; in the absence of experience, it is advisable to consult a specialist.

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

It is advisable to carry out the work in appropriate conditions. The carburetor contains many small parts, the loss of any of them will render the device inoperative.

Possible reasons for failure

The power unit of all chainsaws is a single-cylinder internal combustion engine. Devices of this type are characterized by such malfunctions as a violation inside the cylinder compression, a change in the ratio of the fuel mixture, incorrect operation of the ignition, poor-quality fuels and lubricants. The main problems in the operation of the power unit are as follows:

The engine runs stably at minimum speed, but stalls with increasing speed;
Start-up occurs normally, and idle speed is unstable, quickly stalls;
Does not start.

Chainsaw electronic ignition circuit.

Abnormal idling can be caused by various reasons. They can be divided into several positions:

Reduced throughput of filters (gasoline and air);
Abnormal operation of the ignition system:
The carburetor settings have spontaneously changed;
Malfunction of fuel line elements;
Clogged exhaust ducts, muffler;
Defects of the piston, cylinder, valves.

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

What to do if the chainsaw stalls at idle speed

The chainsaw stalls at idle speed: many owners of this tool face such a problem. In terms of its structure, the saw was a fairly simple tool. But there are times when it fails. The main problem in troubleshooting is determining the correct cause of the abnormal operation.. Once the cause has been identified, fixing the defect is usually quite simple.