How To Fix a Chainsaw That Dies at Full Throttle?

Why does my chainsaw die at full throttle?

The reason your chainsaw dies at full throttle is because of a clogged carburetor, cracked fuel lines, and a clogged fuel flitter. A dusty air flitter can also be the reason your chainsaw dies at full throttle.


chainsaw dies full throttle


Clogged or damaged carburetor

The carburetor is the component of the chainsaw’s engine responsible for regulating fuel and oil to air entering the engine during combustion. If dirt has built up in the carburetor (as it sometimes does when stale fuel sits in it for a long time), your chainsaw will die at full throttle. Some symptoms you may witness when your carburetor is clogged include getting stuck, producing exhaust smoke, and overheating the engine.

If you experience any of these symptoms, you should change your carburetor to prevent permanent damage to the engine and cause your chainsaw to die.


Cracked fuel lines

When you start up your chainsaw, fuel will flow through the fuel lines and into the carburetor. In general, the greater the demand for power, the more fuel your chainsaw will consume. When fuel leaks into the atmosphere because of a crack or clogs in the fuel line, your chainsaw will die at full throttle.

This is why it is vital for you to always check your fuel lines before starting your chainsaw.


Clogged fuel flitter

The fuel filter serves a similar purpose as the air filter by preventing foreign debris from entering the engine. The air filter protects it from debris in the air, and the fuel filter does the same for contaminants. A clogged filter prevents the engine from receiving the proper amount of fuel. This will make your chainsaw keep going at idle but can’t keep running at full throttle.

At this point, you can either clean the filter or replace it to fix the problem.


Dusty air flitter

Air filters on chainsaws prevent dirt and other particles from entering the engine, just like the fuel filter. This dirt and other particles can accumulate and lead to a clog. The engine won’t get enough air to function properly if there’s a clog. Since the filter is likely only partially blocked, it will let enough air into the engine to operate at idle but not at full throttle.

Whenever your air filter is clogged, your chainsaw will die when you try to use it at full throttle. You may prevent this by regularly replacing or cleaning your air filter.


How to fix a chainsaw that dies at full throttle?

You can fix your chainsaw that dies at full throttle by rebuilding the carburetor, cleaning your air filter, and replacing the fuel filter. Another way to fix your chainsaw that dies at full throttle is by replacing the muffler on your chainsaw.


Carefully read the manual provided by the manufacturer. Because each chainsaw is unique, you should not assume that you may skip a step if you have experienced using a chainsaw in the past.


Rebuild the carburetor

Your chainsaw dying at full throttle is a result of a clogged carburetor. You can give a carburetor cleaner a shot at cleaning it for you. If this does not work, you can remove it and give it a more thorough cleaning. Here are steps to follow in cleaning your carburetor.

  1. You can buy a carburetor rebuilding kit.
  2. Disassemble your carburetor, clean it, and reassemble it.
  3. After the carburetor has been disassembled, cleaned, and reassembled, it should be reinstalled, and the chainsaw tested. If it works, that’s great news.
  4. However, if it doesn’t work, you need a new carburetor.
  5. After getting a new carburetor, remember to get replacement gaskets for the connection between the carburetor and the manifold if you change the carburetor.
  6. The fuel filter and gas should be changed to ensure a clean beginning.


Clean the air filter

For optimal performance, the engine of your chainsaw requires a specific amount of air. Your chainsaw will die at full throttle because the air filter is blocked with debris.

Info: Fixing steps for your air filter may vary by brand. Some filters are washable, while some are conventional. Check for your type. Here are the steps to clean the air filters.

  1. Locate the air filter on your chainsaw, and then take it off.
  2. Wash it if it’s too dirty, or replace it if it’s clogged with debris.
  3. You can now put it back and test your chainsaw.

Note: To prevent this problem, you should routinely clean your air filter.

Replace the fuel filter

If the fuel filter becomes clogged, the engine will not receive the necessary quantity of fuel to continue operating normally.


Before firing up the chainsaw again after an extended period of inactivity, it is in your best interest to replace the fuel and the fuel filter. So, follow these steps to replace your fuel filter.

  1. Disconnect the fuel filter from the fuel lines, and once you’ve done that, empty the fuel tank.
  2. You can either clean the filter or replace it to fix the issue.
  3. After emptying the fuel tank, you should inspect the fuel lines.

Note: 4. Ethanol gas should be avoided because it might cause damage to fuel lines, as most experts recommend.


Replace the muffler

Carbon deposits can accumulate in your chainsaw’s muffler and spark arrestor after prolonged use at maximum power. The chainsaw will stop working if the exhaust gases cannot escape the engine due to a blockage.


Before conducting muffler repairs, it is preferable to let the chainsaw cool completely on a flat surface. Put the chainsaw’s accelerator to a stop. Place the “On/Stop” switch on the left rear of the engine in the “Stop” position. Below is how to replace your muffler.

  1. Insert a screwdriver into each of the three screws and spin them counterclockwise to remove the top cylinder cover. Raise the hood and reveal the engine. Remove the black rubber cap covering the spark plug on the engine’s top.
  2. The muffler is exposed when the handguard is removed from the front of the engine.
  3. Now is the time to disassemble the muffler, so remove the bolt cover. Utilize an adjustable wrench to remove the two muffler bolts.
  4. Remove the muffler, the gasket, and the metal rear plate. Then, use an adjustable wrench to remove the lock nut on the front of the muffler.
  5. In the next step, the muffler should be laid flat, front down. Remove the two upward-pointing Phillips screws from the cover of the rear outlet with a Phillips screwdriver.
  6. Remove the spark arresting screen and outlet cap from the muffler.
  7. Clean the spark-arresting screen using a wire brush. You should inspect the screen, gasket, and muffler for damage and make any necessary repairs.
  8. Replace the spark arresting screen and outlet cover on the muffler, then insert and tighten the two screws in a clockwise manner.
  9. After fitting the gasket and muffler to the front of the engine, you can use an adjustable wrench to tighten the two bolts. Replace the bolt cover and tighten the locknut to a snug fit. Replace the spark plug boot and cover using a Phillips-head screwdriver.


Why does my chainsaw die when the throttle is released?

The reason your chainsaw dies when the throttle is released is because of a lack of air, a misfiring spark plug, and blocked carburetor jets. Another reason your chainsaw dies when the throttle is released is an incorrect mixing ratio of the air/fuel.

A healthy chainsaw will make a high-pitched sound when you press the throttle trigger; if yours doesn’t, something is getting in the way of the fuel burning efficiently. Here are a few things you can do when you experience this;

  1. You should get a carburetor repair kit so you can clean the clogged appropriately.
  2. Gummy deposits in your jets can be easily removed using a carb cleaner spray.
  3. Remove the air filter to uncover your carburetor. Usually, the air filter is on the back side of your chainsaw.
  4. Take off the bowl nut and take out the bowl from the carburetor, and clean.
  5. Spray the liquid carburetor cleaner throughout the inside sections.
  6. Then you remove the old fuel, clean up the fuel lines by dismantling them, and spraying them with carburetor cleaner.
  7. Examine the fuel flitter to see if it is clogged. If it is clogged, replace it with a new one.
  8. Inspect your air flitter for dirt. Clean up with soap and water if the dirt build-up isn’t much.
  9. Lastly, you should turn on one of the carburetor adjustment screws to control how much fuel is sprayed into the combustion chamber.


Why does my Poulan chainsaw die at full throttle?

The reason your Poulan chainsaw dies at full throttle is because of a rusted or clogged carburetor, vapor lock, and dusty air flitter. Faulty ignition is also another reason your Poulan chainsaw dies at full throttle.

Poulan chainsaws have two-stroke combustion engines that power their sharp cutting chains. It is possible for a Poulan chainsaw to suddenly die at full throttle. Whenever you experience this, it shows that the engine has not been appropriately maintained.


Vapor lock

The most common cause of your Poulan chainsaw operating poorly or cutting out is a vapor lock in the fuel lines. The high temperature causes the fuel lines to fill with vapor, which stops liquid fuel from getting into the carburetor. Here is how to fix it;

  1. Ensure that the vents on your tank are clean and clear.
  2. Leave the gas cap off for a few minutes so the pressure can equalize.
  3. Once finished, shut it and start your chainsaw again.


Dusty air flitter

Before I look at the carburetor, I check the air filter first, which could be why my Poulan chainsaw won’t start. Like a fuel filter, it cleanses the air before it enters the carburetor. The Poulan chainsaw dies at full throttle when the carburetor can’t produce the correct air-fuel mixture when dust restricts airflow. Here is how to fix it;

  1. Use a screwdriver to loosen the screws that hold the air filter in place.
  2. Take out the filter and look for dirt or deposits on it.
  3. If the dirt build-up isn’t too bad, soap and water will be enough to clean it.
  4. After cleaning, you should probably replace it if it still doesn’t appear in good condition.


Clogged carburetor

Let me tell you that over time, the fuel in your Poulan chainsaw will likely get sticky white deposits. The carburetor jets might become clogged with these deposits, cutting off gasoline to the engine. And this will cause your Poulan chainsaw to die at full throttle. Here is how to fix it;

  1. Get a repair kit for the carburetor.
  2. Take out the air filter to clean the carburetor.
  3. Spray the interior with carb cleaner.
  4. After cleaning your carburetor, check for fuel residue.


Why does my STIHL chainsaw die at full throttle?

The reason your STIHL chainsaw dies at full throttle is because of a clogged air filter, fuel problems, carburetor issues, or inadequate tuning up.

Clogged air filter

The air filter is the most accessible component of the saw and should be checked first when it stops working. After prolonged usage, it’s not unusual for the saw’s carburetor to become clogged, blocking the flow of air and rendering the saw useless. To fix your air filter, below are steps to follow.

  1. The spark arrestor (a screen located underneath the muffler) should be checked and cleaned.
  2. In the end, you’ll have to swap out the fuel filter that lives in the gas tank.


Carburetor issues

Your STIHL chainsaw will die at full throttle if the carburetor is supplying either too much or too little fuel to the combustion chambers. Typically, a Stihl chainsaw’s carburetors will feature three adjustment screws: one for idle, low speed, and high speed. You can follow these steps to solve the issue.

  1. Adjust the idle screw (usually labeled with the letter LA).
  2. If the saw dies at full throttle, or if it doesn’t get up to maximum power, adjust the high-speed (H) screw.


Tuning up

Your STIHL chainsaw can die at full throttle if you don’t do the tuning up regularly. Your chainsaw will continue to function smoothly if you give it regular “tune-ups,” or maintenance procedures. Here are steps for your tuning up.

  1. You need to check the spark plug and replace it if necessary.
  2. Change the fuel mixture and replace the air filters for this process.
  3. After you’ve changed the spark plug, adjust the carburetor to let in less fuel.


Why does my Husqvarna chainsaw die at full throttle?

The reason your Husqvarna chainsaw dies at full throttle is because of wrong choke settings, a clogged air filter, and a clogged cooling system. Using old fuel can also be a reason your Husqvarna chainsaw dies at full throttle.

Choke wrong setting

When starting a cold engine, the choke is utilized to reduce the air entering the engine, which in turn allows the cylinder to take in more gasoline. Below is how to adjust your choke settings.

  1. To keep the engine running once it has warmed up, the choke must be adjusted to the “off” position so that it can no longer restrict air passage.
  2. If you do not withdraw the choke as soon as the chainsaw has started and the engine has warmed up, the chainsaw will stop working because the engine isn’t getting enough air to continue running.


Clogged Air Filter

Your Husqvarna chainsaw’s air filter is a component that requires routine maintenance and should be kept clean and in good condition at all times. Its function is to prevent dirt from entering the carburetor throat, which would otherwise cause the engine to become worn out.

I recommend that the air filter be changed once a year for the typical homeowner and that it be inspected often during the year to see whether it needs to be cleaned or replaced.

To clean the air filter of a Husqvarna chainsaw:

  1. Take off the cover of the engine.
  2. Take the air filter out of the device.
  3. Remove any dust or debris from the housing of the air filter.
  4. You can remove the dirt from the filter by brushing it off or shaking it.
  5. If it is dirty, wash it in a solution of liquid dish detergent and water, rinsing it thoroughly until the water becomes clear, and then allowing it to dry fully.
  6. Replace the soiled filter with the clean one. If the existing air filter is severely dusty, damaged, or fails to seal correctly, you should purchase and install a replacement filter as soon as possible.


Clogged cooling system

To prevent the engine from becoming too hot, overheating, and shutting down, the cooling system must be maintained in a clean state. Remove any dirt and debris obstructing the air intake and cooling fins so the engine may be cooled more effectively. Here are steps to fix this problem.

  1. To accomplish this, remove the spark plug from the engine and wait for it to cool down before continuing.
  2. Take off the engine’s cover, and then clear any debris from the cover and the area surrounding the cylinder’s perimeter.
  3. Remove the engine cover, clean the cooling fins on the cylinder, the pawls on the flywheel, and any other spots where air passes through the chainsaw, and replace the engine cover.
  4. Keep going around the chainsaw and cleaning the outside of it, including the air inlet on the starter.


Old fuel

When it comes to a chainsaw dying at full throttle or even breaking down entirely, the most common cause is a lack of fuel. Old fuel will leave behind sticky deposits, which have the potential to block fuel components.

This, therefore, reduces the amount of fuel that reaches the engine. This may result in the saw turning off unexpectedly. The following are steps to consider when choosing fuel and taking care of it:

  1. Always be sure to use the new fuel. As soon as thirty days after purchase, fuel quality might deteriorate.
  2. In your 2-cycle Husqvarna chainsaw, use a mixture of gas and oil with a ratio of 50:1.
  3. Choose fuel with a minimum octane rating of 89 and a maximum percentage of ethanol that does not exceed 10%.
  4. Blend in some premium 2-cycle oil certifications from ISO-L-EGD and JASO M345 FD.
  5. Add a gasoline stabilizer. Add a fuel stabilizer such as Sea Foam or STA-BIL to keep the gas from degrading and last a little longer. These chemicals will not only minimize the amount of moisture in the fuel system but will also clean it.