A spark arrestor is a tool to prevent sparks from escaping from some opening or a chimney. It averts starting a fire.
It helps and gives time to look for blockages in the screen, and you can ensure the screen is not clogged with other debris or soot.
What is the need for a spark arrestor on a chainsaw?
Chainsaw manufacturers add a spark arrestor on each model of chainsaw to avert combustion of byproducts during saw operation.
It prevents the combustion chamber from escaping and starting a fire. The arrestor is a screen located behind the muffler.
Spark arrestors are necessary for a chainsaw so that it seals the end, and restricts it from catching with flammable debris.
However, good maintenance for the spark arrester is essential as poor upkeep of it results in increased fire risk and poor equipment performance.
Spark arrestors on a chainsaw are the screens limiting the particles found in the outdoor power equipment exhaust gases. The idea is to limit the exhaust particles size.
How to know the spark arrestor needs cleaning?
The indication that a spark arrestor needs cleaning is when the RPM is slower and quieter than in normal running conditions. Lack of power also results in spark arrestors requiring cleaning.
Tips to check a spark arrestor if your chainsaw fails to start
The spark arrestor on the chainsaw averts dangerous sparks from igniting fires, right while it is functioning.
In case the arrestor becomes dirty or clogged, it arrests the exhaust within the motor and prevents running.
The spark arrestor varies with each model. It is in different places but is an integral part of any exhaust system. It is mostly near the spot close to the motor where air leaves.
There is a need to remove the plastic muffler cover on most chainsaws to access the spark arrestor. You may unscrew the muffler cover and reach the rectangular or small square mesh screen.
A single screw mostly holds it in a small metal frame. Remove the screen and look for debris and dirt. It may be clogged by dirt, sawdust, or the exhaust black carbon.
The common working is to allow air to pass through the spark arrestor screen. However, if it is dirty, air cannot leave the engine, so the chainsaw will stop working properly.
Clean the screen using cleaning fluid or replace it with a new one. Choosing to clean regularly ensures the best performance.
You may use a soft brush, and you may ensure you do not puncture or bend it.
Removing of Spark Arrestors from Chainsaws
The majority of chainsaw manufacturers include on each model a spark arrestor to avert combustion byproducts from breaking out from the combustion chamber during operation.
Thus, it prevents starting fire. This arrestor is a small screen fitting behind the muffler. It covers the port of the engine but clogs with carbonized soot thereby affecting the saw performance.
Cleaning and regular removal of the spark arrestor is a crucial maintenance part, and most manufacturers design products making it a simple task.
However, to access the spark arrestor, you have to take out the muffler.
- To remove the spark arrestor, allow the chainsaw to cool if you have been using it for a while. You may set it on a level surface.
- Pull off the plug wire of the spark arrestor to prevent any accident that may cause serious injury.
- Identify the muffler. It is mostly on the engine housing behind any of the two louvered covers. Usually, the muffler is on the housing front behind a small cover. The larger cover of the engine is the air intake port.
- Unscrew the cover using a screwdriver. Some may have placed hex or Torx screws.
- Remove the cover and see the spark arrestor featuring a fine mesh screen attached to the engine housing. Pull off the screen or check if there is another screw to unscrew and release.
Cleaning a Spark Arrestor
Cleaning a spark arrestor is in 2 ways. The design of the spark arrestor is to hold up the heat coming from the engine.
You can clean easily a dirty spark arrestor using a blowtorch. It requires you to hold the spar arrestor using long pliers or tongs and to burn the oil and carbon debris off. Allow the spark arrestor time to cool before placing it in the chainsaw.
If you do not have a blowtorch, use a carburetor cleaning and loosen the debris. Using a carb cleaner allows you to rinse the spark arrestor properly and dry it well before reinstalling it onto the vehicle.
These typically spark arrestors work to remove accumulated particles, if any. It requires a cleanout plug, snaps ring, removable end cleanout, or removable end cap.
A cleanout featuring removable is secure to the muffler using a retaining band or a few screws that help shake out the particles if any. Without fail, inspect and ascertain:
- The spark arrestor is perfect for the application and is in position.
- The exhaust system should be between the spark arrestor and the engine in good condition.
- The spark arrestor is the right fit for the application.
- It should create no modifications to the exhaust system.
The engine failing to come to full rpm is a sign that your spark arrestor on the chainsaw is not working. If so, remove the spark arrestor and clean using a wire brush.
Check the plug, if there is gunk on the electrode, and clean it. The spark arrestor screen is stuck, and with time, it may clog with soot and debris, restricting the operation of the engine.
Many reasons hinder the starting of a chainsaw. Even if you do not use the chainsaw for long, it will refrain from starting.
Thus, run it once a week at least, and if you do not use the saw once or twice a week to keep the parts active. After every use of the chainsaw, give a chain sharpening and good cleaning.