March 29

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Why Does My Chainsaw Bog Down When I Give It Gas?

The dream of everyone in the lumbering field is to have a very powerful and efficient chainsaw that is devoid of mechanical faults. The issue of chainsaw bog down can be very calamitous and it oozes a great deal of frustration.

The chainsaw bogs down will occur when your engine is starved of enough fuel or when there is termination in the connection between the carburetor and the engine. 

More so, the chainsaw might bog and refuse to run when you give it gas. Yea, it’s not rocket science but reality. It’s quite perplexing, but this article will delve deep to unravel the reasons why the chainsaw bogs down when you give it gas and how to solve the problem.

If you experience this scenario, it is likely that the orientation of your carburetor has changed. It’s either it is tilted up or down. It’s all about the adjustment of the carburetor and a slight change in the orientation can lead to Chainsaws Bog.

1

Check Out Your Carburetor For Dirt!

A dirty carburetor is likely to cause Chainsaw Bog. In this case, the speed of the chainsaw will dwindle a great deal. Dirt in the spark arrestor or air filter can also cause the chainsaw to bog.

2

Take a Look At The Labellings

''L'' and ''H'' on your chainsaw. Make sure that its leveled and does not tilt. The ''H'' side means the ''high side'' and its adjustment. It is used to regulate the quantity of fuel that flows through the carburetor during fast paced RPMS. The ''L'' side of the chainsaw means the ''low side'' and it is used in adjusting the flow of fuel in the carburetor when there is a low RPM.

3

Clogged Fuel Tank

Secondly, it's about time we take a look at why your chainsaw suddenly stops working.


The carburetor is like the ''vein'' in engines. Once it is clogged, the free flow of air and fuel will be blocked and the engine will be starved of fuel. To quell this issue, wash away the diets using the carburetor cleaner.


In some scenarios, washing away or cleaning the carburetor may not be effective, hence, you should consider buying a new carburetor or repairing it.


A clogged fuel tank can also cause the chainsaw to stop working. In such cases, endeavor to drain the old file from the chainsaw SNF ensure that the fuel tank is devoid of fuel. Go ahead and buy a new fuel filter.

4

Anomalies In The Air Supply System

The effective supply of Air is key to a healthy chainsaw engine. You should ensure that there is enough air supply to the engine to avoid issues in the combustion chamber. Your engine will clog once the incoming air supply is blocked or less in supply.


Once you work for a very long time without allowing your Chainsaw to rest, get ready because the filters will clog.

These can be accompanied by smoking as a result of rich fuel and oil mixture. The solution to this problem is using compressed air to clean the carburetor jets and passages.

5

Old Un-stabilized Fuel In The System

Fuel stabilizers are a must-have for any chainsaw owner who fancies leaving their equipment idle. They help prevent gum formation in fuel tanks. Gum clogs fuel lines and carburetor. The end result is less supply of fuel for complete combustion to run the saw.

6

The Percentage of Ethanol In Your Fuel

Another plausible explanation for the stalling is attributed to the percentage of ethanol in the fuel. Ethanol readily vaporizes and combines with water in the air to form water. This water stops combustion which is necessary for running the motor.


Experts counsel that fuel containing up to 10% ethanol has a tendency to separate varnishes from the gas, resulting in accumulation in fuel lines and tank. The residue counters combustion in the carburetor.

7

Fuel Flow To The Carburetor

Too much or little fuel results in engine stalls. The three adjustment screws in the carburetor ((High speed, Low speed and idle) come in handy when preventing stalling. Adjusting the idle screw, for instance, is a corrective measure for a chainsaw stalling when idle.

8

Inability To Reach Full Power

The inability to reach full power during a full-throttle trigger is also a sign of bogging down. Remedy this by adjusting the high-speed screw.

How to Prevent Your Chainsaw from Bogging Down


  • Correcting stalling measures are generally referred to as tune-ups. These procedures help in improving your chainsaw performance.
  • They include inspection of spark plugs, filters, and carburetor adjustment. Sparkplugs are a litmus test to the fuel economy of your chainsaw. A sooty plug is an indication of a rich fuel mixture resulting in frequent misfiring.
  • Burnt plugs could mean the fuel combustion is too high or high ethanol concentration. To cure this, replace the sooty plug with a new one to prevent misfiring when cutting firewood. Ensure you adjust the carburetor to reduce the amount of gas used.
  • You may have to contend with disassembling your carburetor to correct the mechanical issues bringing about the stalling. Before you to this drastic step first exhaust all possible causes of the problem.
  • Use a starting fluid and letting it run flushes gunk out of the jets as an alternative to rebuilding the carburetor.
  • Confirm for water and debris in your fuel tank. if t present cleaning your tank isn’t an option.
  • Inspect the fuel line condition. Older saws have degraded lines which need replacement.
  • Clean or replace filters located in the fuel tank of your chain saw.
  • The removal of the carburetor fuel line is very sensitive. Make drawings drawing on the lines connections to allow easy re-assembly.
  • Use big lines will for fuel filter lines connected to the inside of the tank. Also, use smaller of two lines for return to the fuel tank from the carburetor from the primer bulb.
  • Replacement of carburetor is the best option if you have an old chainsaw. This is because the diaphragm gets hard making it hard to crank.
  • However, if you decide to clean your carburetor use a thinner to clean the gum buildup. Ensure the important plastic parts are removed due to the thinner’s ability to dissolve plastics.
  • Follow the re-assembly instructions which are usually supplied with the carburetor kit (Assuming all the jet screws and small parts are accounted for). Alternatively, you can use professional help. Usually, after thorough cleaning of the carburetor and filters, your stalling issues should disappear. However, if the problem persists you may need to enlist the help of a professional.

Final Words

Chain-saw requires constant maintenance to be efficient. Even without an incident of stalling, it is important to carry out regular repairs. Stalling is a symptom of a complication in the chain-saw. A well-maintained chain-saw seldom stalls.

About the author

Chris Ross

My name is Chris Ross. I'm an arborist by profession & a blogger by passion.Currently I live in Austin, United States. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. I love to write about chainsaw for homeowners and professionals. I hope my epic guides will help you to choose,buy and maintain chainsaw.


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