Husqvarna 137 throttles on throttle

Fuel system

If your Husqvarna chain saw is not working properly, fuel is not getting to the master cylinder. There are several reasons for this malfunction:

To clean the chainsaw’s fuel hose, you must carefully check the fuel supply. It is recommended that you replace the old hose every three months and buy a new part. If the air hose is dirty, there is no air flow into the system, namely to the carburetor. Most often it leads to a malfunction of the engine processes. The filter can be cleaned with water, but it must be done very carefully.

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The part is thoroughly dried and installed in its original place. Your Husqvarna 137 comes with a manual with detailed hose replacement and cleaning instructions. If you do not adhere to the rules, you can aggravate the situation.

The most common cause is a clogged channel or failure of the carburetor diaphragm. If this is the case, it is advisable to replace the part and clean the ducts. After that the chain saw will run smoothly.

Gap between ignition coil and flywheel

A wrongly exposed gap between the flywheel and the ignition coil contacts affects the quality of spark formation, which in turn is responsible for normal starting and stable engine operation.

The breather plug is clogged

This small hole on the chain saw’s tank is designed to allow air into the tank. Depending on the model, it is located in the cover or in one of the walls of the ignition coil. A clogged breather leads to the creation of vacuum inside the tank, which prevents the flow of fuel into the carburetor.

Why does the chain saw choke and choke immediately when you step on the gas?

Chainsaws are fairly rugged and uncomplicated designs. So if you properly care for them and treat them starting from the recommendations of the manufacturer, then they fail very rarely and rather quickly eliminated a different kind of failure. But if you are confronted with this situation and you want to repair your tool yourself without the help of professionals, then take a look at the information below.

In fact, it is impossible to identify the cause of why the tool does not start or stops when you press the gas, as there are many factors affecting this. But we shouldn’t forget that as a chainsaw is equipped with a simple two-stroke engine, the following conditions are important for its effective performance: lubrication, fuel, spark and air.

Consequently, the fuel-air mixture is prepared directly by the carburetor, the filter cleans the air from dust, the ignition unit and the spark plug create the spark, and the gasoline contains the lubricant.

Хускварна Huscqvarna 137/142 не набирает мощности #ВикторПолев

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That is why it is necessary to search for the causes of this kind of failure in sequential order, starting directly from simple ones and gradually passing to complex ones. This is an important factor for a proper repair, because the person who starts disassembling the carburetor without thinking about it, puts it at risk. Because this kind of unit should be repaired or adjusted directly in special workshops (read about carburetor adjustment).

Improper fuel

The fact that for the trouble-free operation of the tool it is necessary to be attentive enough directly to the fuel is not unimportant. Because if this kind of mixture will not be prepared properly, most chain saws simply will not start. Consequently, not every owner will suspect that the cause of failure is in the fuel. That is why your tool should always work properly to use only high quality gasoline.

And also use only the oil that is made by the manufacturer of your tool. It is also important to prepare this kind of mixture in the quantity you exactly use in one or two weeks, but no more (see Наиу. the ratio of gasoline and oil for a chainsaw).

Otherwise, overcooking the mixture directly in the canister will lead to the fact that it will lose all its octane properties and it will lead to significant problems with the tool.

Mixture in the plug at the moment when the machine is running

Also the cause of failure could be the direct pouring of the mixture at the moment when the mechanism is running. To solve this problem, you need to unscrew and dry the spark plug, but remember that you must not bake it in any way. Excess fuel must be drained through the hole (spark plug), wait 20-30 minutes, then install it in place and try to start the tool again.

The spark is absent and the chain saw does not pick up speed

The chainsaw stalls when you press the throttle because there is no spark. This can happen if there is no good contact between the spark plug boot and the (high-voltage) wire. However, if this kind of connection works correctly, but the spark is still missing, then the cause is the ignition unit (electronic). It is important to note that this kind of parts are not repairable, so they can only be replaced.

Do not forget that through the examination of the spark plug you can get considerable information concerning the failure of the chainsaw. Because if its surface is dry, the reason is the cylinder, which is not directly supplied with fuel. That’s why you have to check the whole range of its supply step by step. If the spark plug is all black soot, it means that the carburetor is not working properly, that is, it either supplies a lot of fuel or overflows oil directly into the gasoline.

Not enough fuel to feed and run the chainsaw at full power

If chain saw stops when adding gas, it means there is not enough fuel to make the chainsaw work properly. It may be caused by a clogged carburetor (its nozzle) or contamination of the filter (fuel filter). Remember that the first unit should be checked only by professionals, but you can clean the second one yourself.

The filter is clogged

In addition, the filter (air filter) may also malfunction if it is clogged with dust. But remember that every model has its own easy-to-troubleshoot and typical characteristics. Exactly for this reason do not begin hastily disassemble and repair the tool, and it is better to visit forums, where a huge amount of different owners reviews are listed, so as not to make things worse.

For example, a STIHL chain saw cuts off when you press the throttle for a simple reason, namely simply because the breather plug is clogged.

In order to fix this kind of problem all you need to do is to disconnect the hose (fuel hose) from the carburetor and look at the fuel leaking from it. Since if the mixture flows in a full stream, it means that the breather is not contaminated, and if vice versa, then the cause of the breakdown is found.

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The silencer as the reason why the saw cuts out under load

Another reason why the chainsaw stops when you press the gas is the muffler. It is this part that can interfere with the full operation of the tool in those cases where it is contaminated directly by exhaust tar deposits. To do this, you would simply have to clean it.

Cylinder and piston group

It is fairly common for a Partner chain saw to choke on impact and this is caused by the cylinder piston group. Since through their inspection, namely the piston and cylinder, you can easily determine the cause of the failure of the tool, directly replacing them. You can also do a direct boring of the cylinder itself in relation to the size of the new piston.

But if after examining it you find that both the piston and the cylinder have no damage, in that case the cause may lie directly in the rings (piston). To check this, you need to put the piston in the cylinder and gently rock it with the crank. If you feel any slackness then the rings need to be replaced because they are already worn out.

Lack of chain lubrication prevents the chain from starting and the saw doesn’t rev up

Many people wonder why the chain saw stalls when I step on the gas? The answer could be inadequate lubrication of the chain block (see the next page). chainsaw chain oil), because the oil pipe may be leaking or the direct channels may be clogged. That is why you should pay attention to the chain, because if it is dry, do not hesitate to clean the ducts that are engaged in feeding oil directly to the bar of the tool.Then examine in detail the parts where the oil pump connects to the tubes. But if you notice that the oil is leaking at the joints, or you find cracks on the tubes themselves, then in the first case, seal the leaks with sealant, and the tubes will have to be replaced.

If the chainsaw fails to start and stops at idle, the first cause is a clogged muffler. To get the chainsaw to work at idle speed, the L screw on the carburetor needs to be adjusted. If the tool stops when idling, turn the screw clockwise about 0.5 turns.

A common cause for this behavior is improper carburetor adjustment or air sucked in through the crankshaft oil seals or carburetor seals. It can also be caused by a leaky carburetor.

Signs of characteristic failures

If the saw engine does not rev up and shuts down, does not develop power, and shuts down under load, there is likely a lack of fuel or improper carburetor adjustment.

The list of possible causes include a dirty fuel filter or air intake filter element, too rich or poor gasoline-air mixture.

Signs of an engine running on a rich mixture:

Chainsaw stalls when you press the gas. most likely the mixture is too lean.

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