My Chainsaw Won’t Start! – Most Common Causes and Solutions!

By | 9 December 2020

A chainsaw is a quick and easy way to saw wood, but not if it doesn’t start. You can find out which are the most common causes of the problems and which solutions are helpful in our at-home article. If the chainsaw does not start anymore or the engine switches off again after a short time, you need to go to troubleshooting and do not attempt any further starting.

Make sure in advance that the chainsaw was started according to the manufacturer’s instructions.

First, check the fuel tank to see if there is enough fuel in the chainsaw. Here are a few reasons why the gasoline chainsaw no longer starts.

My Chainsaw Won’t Start! - Most Common Causes and Solutions!

Chainsaw Won’t Start

  • Check the tank: The most common reason for the failure to start is too little fuel in the tank. You should therefore first and foremost check whether there is enough fuel left. If not, refuel. You also have to pay attention to the mixing ratio, because your chainsaw needs a suitable oil-gasoline mixture.
  • Clean the air filter: Another reason could be a clogged air filter. If it is stuck with dust or other residues, the engine cannot draw in enough oxygen and will not start. You will receive a further indication of a clogged air filter if the engine stops again after a short run. Then you should clean or replace the air filter.
  • Clean the fuel strainer: In addition to the air filter, the fuel strainer is also critical to the proper operation of the chainsaw. If the sieve is clogged, not enough fuel can get to the engine and the chainsaw will not start. You should therefore check the fuel tank for dirt and clean the sieve. In addition, when refueling, you should make sure that no dirt or other residues get into the tank.
  • Carburetor: The carburetor is one of the most important components of your chainsaw, so it needs to be looked after accordingly. If the carburetor is dirty, the engine will no longer run. You should therefore check the carburetor after the causes mentioned above and clean it if necessary. However, this is not easy and requires specialist knowledge, which is why cleaning in a workshop is the better alternative. Note: Often times you will be told to readjust the carburetor. However, the settings do not change and therefore a new setting is not necessary and would even worsen the problem. If the carburetor is set incorrectly, it can even lead to engine damage in the worst case.
  • Motor problem: If you have been able to rule out all of the previous causes, there may be a problem with the motor. General engine damage can also be the cause. If you do not have the necessary specialist knowledge to check the engine or, if necessary, to repair it, you should have this done in a specialist workshop. Tip: Sometimes only the spark plug contacts are dirty. You can clean this yourself with a cloth. Replacing the spark plugs is another way of putting the chainsaw back into operation.

Dirty Air Filter or Sooty Spark Plug

If the air filter is very dirty, the engine will no longer get enough oxygen and the starting process will deteriorate significantly. If the chainsaw goes out again shortly after it is started, this is an indication that the air filter has become clogged.

Check the air filter on your chainsaw and clean it if necessary. With frequent use, it is quite normal for soot to build upon the spark plug.

The more soot that forms on the electrode, the worse the ignition, which can lead to misfiring. If the chainsaw starts up and goes off again a short time later, this is a sign of this.

Remove the spark plug and clean it. In the event of heavy wear, it is advisable to replace the old spark plug with a new one.

Bad Mixture, Old Fuel, or Clogged Fuel Strainer

Old fuel is a common reason why starting difficulties occur. The fuel loses its quality, especially when the machine is parked for a long time, and several attempts are necessary to restart the chainsaw. An incorrect mixing ratio between fuel and two-stroke engine oil can also lead to this.

These two causes are very easy to confirm. To do this, remove the old fuel properly and buy special fuel such as ASPEN 2 or Motomix. This is a high-quality fuel for two-stroke engines that are already mixed. If the chainsaw runs again afterward, you have found the cause.

If foreign objects get into the tank when refueling the chainsaw, the sieve on the petrol intake hose can clog and the engine receives too little fuel, the engine starts briefly, but then switches off again immediately. Therefore, check the fuel tank for possible contamination.

The Carburetor is Dirty or Incorrectly Adjusted

The carburetor is located below the air filter; if used very frequently, fine dust and small amounts of sawdust will settle here as well. If the capillaries are no longer completely permeable, the gasoline-air mixture changes, which affects the performance of the engine and can lead to an aborted start.

If you feel confident enough, you can remove and clean the carburetor, if not, you should go to a workshop who can clean the carburetor. When cleaning the carburetor, you can also check the components (membrane, nozzle, etc.) for possible signs of wear.

The reasons for changing the setting of the carburetor are different. Even if the setting can be changed very easily on many machines, you should only do this if you know about it.

In addition, the operating instructions must not be missing, they contain all the necessary information. A change should only be made if all other points just mentioned have been excluded.

If, for example, the air filter is dirty and I only change the setting of the carburetor, the saw may run again for the time being, but this can, in turn, have a negative effect on the engine. So always work through all other points in advance.

Chainsaw Has an Engine Failure

In the worst case, your chainsaw has suffered engine damage, which can be caused by using the wrong gasoline, overloading, or age. If the pistons have stuck, any attempt to start is in vain.

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