Reason For Why Your Chainsaw’s Power Is Going Down!

You need to do a big job, but your chainsaw isn’t strong enough. It moves slowly and is losing power.

A chainsaw loses power when the engine doesn’t get the right amount of air, fuel, and spark to burn. This could be because the carburetor is dirty, the fuel vent is blocked, the air filter is blocked, the spark arrestor is clogged, the spark plug is dirty, or the carburetor is out of adjustment.

Keep reading for more things that can cause power to go out. Follow all of the safety instructions in the chainsaw’s owner’s manual, such as removing the spark plug wire and waiting for all of the parts to stop moving before you start making repairs.

Causes of your chainsaw losing power:

  • Plugged air filter
  • Clogged spark arrestor
  • Clogged fuel filter
  • Plugged or punctured fuel line
  • Old fuel
  • Dirty carburetor
  • Plugged fuel vent
  • Dirty spark plug
  • Carburetor requires adjustment
  • Chain brake is engaged


Chainsaws lose power when they don’t get enough air.

For a chainsaw to work well, it needs air. If the chainsaw doesn’t get enough air, it can start to lose speed and power. Check for things like a clogged air filter and a clogged spark arrestor that could block the airflow.

Besides checking these things, make sure the choke is in the right place. When the engine is cold, the choke is used to begin it. Once the motor is warm, the choke must be moved to the “off” or “run” position, or the engine will lose power and die.

Chainsaw Air Filter Plugged In

A saw has an air filter so that the engine doesn’t take in dirt and sawdust from the dirty area where the saw is running. When dirt gets into the throat of the carburetor, it can cause wear and long-term damage to the engine.

The air filter needs to be changed or cleaned often. If it isn’t, dirt and debris can build up on the filter and make it harder for air to flow through. If the air filter is clogged, power will go out.

When your air filter gets so dirty that it stops letting air through, you should get a new one. Never use a chainsaw that doesn’t have an air filter. This can cause a lot of damage to the engine.

The spark arrestor on a chainsaw is clogged.

The muffler of a chainsaw is where the spark arrestor is. It is a small screen that stops hot exhaust from the chainsaw from shooting out and hurting someone or starting a fire.

Carbon can build up and block this screen. You might lose power to the chainsaw to the point where it won’t run at full RPMs. This is because the engine can’t get rid of waste gases as it should.

This screen needs to be checked and cleaned often to keep dirt from building up. To do this, first remove the wire from the spark plug and let the saw cool down.

Carefully take off the screen that stops sparks. Use a small metal brush to clean it. If the screen is broken or has holes, you should replace it with a new one.

Once you have put in a new or clean spark arrestor, reconnect the spark plug wire if you are done with all repairs and maintenance.

Chainsaws lose power when they run out of gas.

Fuel is another important thing that can make your chainsaw have less power than it should. If the engine doesn’t get enough fuel, it will get stuck and move slowly. Check the fuel system and anything else that could stop fuel from getting to the engine.

Chainsaw with old gas

If you find that the fuel in your chainsaw is old, empty the tank and fill it with new fuel. Here, you can find out more about the best fuel for your chainsaw.

If you add something to the fuel, like Sea Foam, it will help clean out the fuel system. Then check to see if the fuel filter is clogged, if the fuel line is plugged or has a hole in it, or if the carburetor is dirty.

The fuel filter on a chainsaw is clogged up.

Inside the gas tank is where you can find the fuel filter. It is attached to the end of the fuel line and strains the fuel in the tank. It keeps dirt and other things from getting into the fuel system.

If you don’t change the fuel filter often enough or if you use dirty fuel, it can get clogged up and stop enough fuel from going through the filter. A chainsaw will lose power because the fuel isn’t getting to it.

Inside the fuel tank of a chainsaw is where the fuel filter is. It’s a small part that looks like a cylinder and is attached to the end of the fuel line.

To get to the filter, wipe around the fuel tank cap to get rid of any loose dirt, remove the cap, and hook the fuel line with a clean, bent wire and pull the fuel filter out of the tank.

The fuel line on a chainsaw is clogged or has a hole in it.

If you let old fuel sit in the chainsaw for a long time, it will probably leave varnish and other sticky deposits that clog the fuel line. This can slow the flow of fuel.

When you find a clog, take the fuel line off and clean it with carburetor cleaner. This will get rid of the clog. To get rid of the blockage, spray the carburetor cleaner into the line. Then blow pressurized air through it to get rid of the blockage.

Spraying the cleaner and blowing compressed air through the line until the blockage is gone. If you find that the line is dry or cracked, you should get a new one.

Another thing to check for is a fuel line that has been broken. If a line is broken, air can get into the fuel system. When the right amount of fuel and air is no longer in the cylinder, adding air can make your chainsaw lose power.

A chainsaw’s carburetor is dirty.

The carburetor mixes air and fuel in just the right way for a chainsaw to start and keep running. The small parts can stop working properly or the passageways can get clogged up, which can make the chainsaw move more slowly.

A carburetor often stops working because the fuel is old. You might be able to get your carburetor to work again if you clean or rebuild it. If this doesn’t work, you will have to get a new carburetor.

A chainsaw’s carburetor needs to be fixed.

To change the RPMs at idle and at full throttle, the carburetor may need to be adjusted. It could be making the engine run too rich, which is why the choke needs to be on.

On the carburetor, there are adjustment screws that can be used to make these changes. Most chainsaws have three adjustment screws: one for low speed, one for high speed, and one for the “idle” speed.

Let the chainsaw run at a slow speed while you turn the low-speed screw clockwise and counterclockwise to find the “sweet spot” where the chainsaw runs smoothly but not too slowly.

Next, turn the high-speed screw until the RPM at full throttle is smooth and good. Don’t make too many changes or let the RPMs go up too much, or you’ll hurt the engine. If your chain moves when it’s not moving, you may need to change the idle screw.

Some makers of chainsaws put limits on how many changes the owner can make to the carburetor. Bring your chainsaw to a local chainsaw dealer if you’re still having trouble with the carburetor or if your model of Husqvarna doesn’t let you make adjustments to the carburetor.

Your dealer may only be able to make the necessary changes because they need a special tool.

Chainsaw’s Fuel Vent Blocked

The fuel tank needs to let air out so that the air pressure inside the tank is the same as the air pressure outside. When the vent gets clogged and air can’t get through it, the fuel tank will create a vacuum that will stop fuel from getting to the engine.

Your chainsaw’s fuel tank vent may be a small cylinder that is attached to the chainsaw and lets the tank vent. On some chainsaws, the fuel cap assembly includes the fuel tank vent.

Use a vacuum tester to see if the fuel tank vent is clogged. If you don’t have a vacuum tester, don’t worry. You can use this method instead:

Set the saw down on a flat surface.

Start it.

Take the choke off. Loosen the cap to let air into the tank and see if the engine runs better.

If it does, tighten the fuel cap and run the saw to see if it runs slowly again until you loosen the cap to let air into the tank. If you can make the problem happen again, you will need to change the fuel tank vent.

Chainsaws lose power when they don’t have a spark.

A spark is needed to light the mixture of fuel and air so that it can burn in the cylinder and keep the chainsaw running. When there isn’t a consistent spark, the chainsaw will slow down and lose power.

A chainsaw’s spark plug is dirty.

A part that wears out is the spark plug. It needs to be changed often. For casual use, I think you should replace it once a year. But if you use your chainsaw a lot, you’ll need to change the oil more often.

Over time, the spark plug will get dirty, which will make the spark go out and cause the engine to lose power. Take out the spark plug and look at the end of it. You can try to clean it with a wire brush so you can use it again if it is dirty but not very dark.

If the spark plug is very dark and has broken porcelain or a burned electrode, you need to get a new one.

Other Things That Make a Chainsaw Not Work:

A chainsaw’s chain brake is turned on.The chain brake is a plastic handle that sits in front of the conventional chainsaw handle. This is a safety feature that protects the person using the saw when it kicks back.

When the chain brake is on, the chainsaw will lose power and slow down. Make sure the chain brake is turned off by checking it.