Husqvarna 240 chainsaw does not pump fuel

Repair Husqvarna 142 With Your Own Hands Video

Husqvarna 142 chainsaw repair with your own hands

Why you need to tune your Husqvarna carburetor

The carburetor is one of the important mechanical components that make up a chainsaw. Its tasks include. mix fuel with air and deliver the mixture to the engine. But in the process of work of the chainsaw there are situations when the adjustment of the carburetor Husqvarna becomes necessary. Depending on the causes, carburetor tuning of 142 and other series chain saws is performed to prevent the following situations:

Because the carburetor affects the quality of the fuel, in the first case the need to adjust the carburetor of the 137 saw or other professional series, such as the Huskvarna 240 or 260, involves influencing a sufficient amount of fuel entering the carburetor to mix with the air mass. It is known that maximum productivity is only possible with a certain ratio of these substances. The second point of adjustment of the carburetor mixer chainsaw is due to the lack of incoming air, which causes underheating of the injected gasoline with its output in the form of thick smoke. Timely change of parameters with your own hands to reduce the amount of fuel injected will significantly reduce the consumption of this product.

The repair itself will save not only your budget, but also the time it takes to transport it and the line at the repair shop. The same applies to the replacement of various spare parts in gasoline-powered tools, such as the chain on a chainsaw or a universal grass trimmer head on a motor pump or oil for electric drives.

When you need to adjust your Husqvarna carburetor chainsaw

Neglecting deviations in the normal operation of the gasoline tool is fraught with the fact that even with a strong desire to adjust the carburetor chain saw Husqvarna may be useless, and will need to replace either this unit or already engine components, subjected to prolonged thermal or mechanical stress. Therefore, as soon as the saw shows the first deviations, it is necessary to make immediate repairs in the form of simple corrective actions. Among such changes in operation we note:

  • The chainsaw slows down too slowly;
  • The tool does not reach its maximum power, and it drops quickly when loaded;
  • The motor often stops;
  • A chain saw makes a lot of noise when working;
  • Chainsaw emits uncharacteristic amount of smoke, increasing at every stage of loading.


The excellent technical and performance characteristics of the tool are confirmed by positive feedback from owners and service and repair specialists. The price of the tool is fully compensated by its performance, reliability and durability of operation.

The advantages of the Husqvarna 240 model include:

  • Combination of small weight and dimensions;
  • economical fuel and oil consumption;
  • no cold start problems;
  • A successful two-circuit air purification circuit;
  • The balance of the body and the comfortable grip shape of the handles;
  • The saw can be controlled with the multifunction control lever.

Positive reviews

The machine is satisfied on the whole with most users. It is praised for its high power, state-of-the-art technology and ease of use. At the same time, the proprietary reliability of the housing is preserved. Although some components are made of plastic, they are practically unacceptable.

Unlike competitive domestic models with increased capacity, in this case we can also note the reliable carburetor Husqvarna 240, which does not cause any problems when adjusting. Recommended parameters are set at the factory, but each user can reconfigure it to his or her needs, if desired.

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A new chain saw won’t start

It is not uncommon for a brand-new chainsaw to fail to start the first time. When starting her engine cold, the switch is set so that the choke is closed. Now pump the fuel into the carburetor, and then give the starter grip a good yank. It is normal if the tool starts but stops after 2 to 5 starts. After that, you can turn the switch to the half throttle position and then to the work position and continue to start the chainsaw.

Design and use

Use of the Husqvarna 240 chain saw is not limited to standard firewood functions. With its help you can easily clear a large area from shrubs and old trees, shape the crowns of ornamental plants in the garden, use it in construction for sawing boards. Sufficient power and bar length allows cutting wood both lengthwise and crosswise.

The classic design of the brand is combined in this model with high technical characteristics and usability. The Husqvarna 240 is a home-use chainsaw, but it performs like a professional saw. The manufacturers have included features such as easy start-up, dual air purging, and vibration reduction in this saw. Ergonomic control levers and grip handle provide maximum comfort and reduce the strain on the operator. Main parts are located so that they are quickly and easily accessible in case of repair.

If you follow the instruction manual and carry out regular preventive maintenance of your chain saw, no need for repairs in the majority of cases. But even in case of breakdowns the tool will not cause you much inconvenience. original spare parts can be easily purchased and replaced. The detailed structure of the Husqvarna 240 chain saw is shown in the diagram below:

husqvarna, chainsaw, does, pump

Adjusting the chain saw carburetor

Most chainsaw carburetors have three adjustment screws:

  • L. screw of the nozzle for low speed adjustment
  • H. nozzle screw for high RPM adjustment
  • Screw. T at Partner and Husqvarna (Stihl LA). adjustment of idle speed of the chainsaw

The H and L screws are used to adjust the gasoline/air mixture ratio determined by the carburettor choke opening. unscrewing it enriches the mixture and rpm increases, tightening tightens the mixture and lowers rpm.

T(LA) is for adjusting the idle speed. The basic adjustment of the chainsaw is done at the factory during final testing. The carburetor is usually set for a richer (than optimal) fuel mixture. The factory adjustment must be maintained for the first few hours of operation of the saw. Then (optional) fine-tune the carburetor.

Start with the idle speed setting by turning the screw T (LA) counterclockwise until the chain stops completely at a stable engine speed.

For further fine tuning you need a tachometer and it is better to entrust it to professionals. especially because in most cases it may not be needed.

To set the tool use screw L first, then use screw H and finally screw T (LA).

find the highest idling speed, to do this turn slowly the screw L in different directions. After finding the position of the maximum engine rpm turn the screw L a quarter of a turn anticlockwise. Adjusting the chain saw carburetor 180, 230, 250. if the chain is idling, the screw T should be turned clockwise until it stops.

The H screw adjusts the power and speed. Adjusting the carburetor to a lean mixture leads to excessive RPM, overheating of the engine, and failure of the chainsaw’s piston.

Let the chainsaw idle for at least 10 seconds and turn the H screw a quarter turn counterclockwise. Adjustment of chainsaw carburetor by example. Let the engine run for about 10 seconds. then check the maximum engine rpm with a tachometer. How to tune the carburetor on a chainsaw Husqvarna Adjust the carburetor on this video Husqvarna 240. If the maximum RPM is not what it should be, repeat the adjustment. If the mixture is too rich, the muffler starts to smoke, if the mixture is too lean, the saw squeals and overheats.

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Finish the adjustment by adjusting the idle RPM as already described above. The idle speed is set correctly if the engine runs smoothly at minimum rpm and the chain does not rotate.

The carburetor can be considered adjusted if the engine accelerates quickly and sounds like a four-stroke at full throttle.

Adjusting the carburetor on a Husqvarna 240 chain saw

Swedish chainsaws Husqvarna presented on the market models of professional and consumer class. Outstanding performance, durability, versatility make the manufacturer’s tools in high demand in the global market. Reliability and durability is also provided by quality chainsaw assembly, parts made of forged steel and durable plastic.

No chainsaw starts. Why? Causes and avoidance.

Home ” Chainsaws ” Miscellaneous ” Chainsaws don’t start. Why? Causes and avoidance.

Your chainsaw will not start? It often happens at the most inopportune moment when you have an urgent need to work. You should agree that this is not unpleasant. We must admit that chainsaws from famous manufacturers (STIHL, Husqvarna, Echo, Solo and others) do not start much less often than from Chinese producers. Today we will discuss the causes of this unpleasant event and how to avoid it. If you don’t find your reason among those listed, you can in the discussions.

husqvarna, chainsaw, does, pump

To begin with, we must determine whether you have a new chain saw that won’t start or if it has been in use for a long time. This is important so they can take steps to fix the problem.

If your new chainsaw won’t start, then:

  • If it has not been 14 days since your purchase, you can return or exchange your chainsaw. This is the most sensible way of all. (When you buy a chainsaw, be sure to ask the salesperson to start it. This does not concern internet stores, because serious PMs always check the goods before sending them to the buyer.)
  • In the case if it is not possible to exchange the chainsaw for objective reasons, or if more than two weeks have passed since the purchase, the reasons are probably quite serious. To be sure your chainsaw won’t start for technical reasons and not due to oversight, read the manual carefully.
  • Next, we’ll look at the reasons why the chainsaw can not start, which are suitable for both new and used chainsaws.

Here are the reasons a chainsaw won’t start in this testing sequence.

  • Check the fuel in the tank and its quality. It is logical to say that without fuel your chain saw will not start. So if there is no fuel, then fill it up. If you have left fuel in the tank for a longer period of time (more than three weeks), empty it and put new fuel in. Leaking fuel that is stored with the access of oxygen quickly loses its octane rating and becomes unsuitable for the use of the chain saw. Read more about fuel here: How to thin gasoline for chainsaws? Oil selection, proportions
  • Check the chainsaw‘s spark plug. First to whether or not it is primed. If it is wet, wipe it off, blow it out and screw it back in. Secondly, check for spark. This can be checked by unscrewing it and putting the tip on the cylinder block and pulling the starter cord. If you get spark, we’ll go on to the next reasons. Third, check the condition of the spark plugs. Read more about how to diagnose a chainsaw on the state of the spark plug here: diagnosis of the chainsaw engine by the state of the spark plug.
  • Check the air and fuel filter. Badly clogged filters can prevent a chain saw from starting. The air filter is located right under the top cover on the chain saw. The fuel filter is in the tank. Also check the breather filter, also in the gas tank. To diagnose the problem, it’s best to take them off and try to start the machine without them.
  • Check the muffler for carbon deposits. Read more about muffler cleaning here: Cleaning Your Chainsaw Muffler.
  • Inspect all hoses and connections. A loose connection or cracked hose is often the cause of a chain saw that won’t start. Also check the crankshaft oil seals.
  • Clean the carburetor. It is best to disassemble the chainsaw carburetor on a vacant table, laying out clean cloths. Lay out all the spare parts separately so that they can be assembled more easily. You must clean the carburetor with special products for cleaning jets and injectors, for example.
  • Check the ignition system. You might have a bad angle or flywheel misalignment.
  • If the previous measures did not help and the chain saw is still not working, you may need to adjust the carburetor. Adjusting the carburetor on any chainsaw is the same as in the link above. The only exception is STIHL chain saws that have only one idle speed adjustment screw.
  • The most unpleasant situation is when none of the above measures helped. This may require replacement of the cylinder block (cylinder-piston group). There are three ways to check this: 1.If the piston won’t move in the cylinder, the cylinder head definitely needs adjusting. Of course it is possible to put a new piston and bore the cylinder, but it does not give the same result as when a new cylinder head is installed. 2.Disassemble the chainsaw and perform a visual inspection. 3.Remove the muffler and inspect the visible part.
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Husqvarna 240 Doesn’t Start, Reasons

The Husqvarna 240 chainsaw differs from most on the market because of its excellent factory-assembled quality. Garden tool is equipped with a durable gasoline 2-stroke motor, the cylinder volume of which is 38.2 cm3. The engine is complete with a reliable hand starter, a proprietary Japanese Walbro carburetor, a hand pump for fuel pre-pumping, and a fuel tank.

Husqvarna 240 won’t stay running

For more convenient operation the Husqvarna 240 chain saw is equipped with a modified vibration suppression system. The structure of the system includes 6 metal springs, which, when the engine at maximum speed, take the vibrations of the crankshaft. So there’s virtually no vibration at all on the handles of the garden tool.

For continuous communication between the engine and the sawing bodies in the device model provides a durable clutch, all parts of which are made of metal, highly resistant to wear and corrosion. High-quality ignition system with coil, spark plug and electrical wiring for the ignition of the fuel in the cylinder.

The saw chain of the garden tool includes a steel bar and chain, which is lubricated by an automatic oil pump. Husqvarna 240 chain saw chain is tensioned via side-mounted sprocket. The model has a long-life inertia brake that can be engaged and disengaged with a separate lever to stop the headset in case it strikes a nail or metal wire.

The 240 Husqvarna chainsaw comes with a sturdy housing made of impact-resistant plastic. It has separate plates that, if necessary, can be removed. It simplifies carburetor repair and chainsaw consumable parts replacement.

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