Why Does My Chainsaw Bog Down When I give it Gas?

If you are in the lumbering industry a chainsaw bog down is not only frustrating but an economic problem. You want a reliable, efficient chain-saw that gives you fewer headaches. Here is a brief explanation as to why your saw is misbehaving.

A Problem With the Air Supply System

Air supply is as crucial as fuel supply in any internal combustion engine. Any internal or external factor leading to less supply of combustible air results in bogging down. This is partly attributed to clogged filters because of long working hours, and less air supply to the carburetor.

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.

Old Unstabilized 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.

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.

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.

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.

Check this too: Best Chainsaw Chain For Hardwood

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.

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.

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