For any person operating the chainsaw, it is imperative to know How Chainsaw Carburetor Works.
Undoubtedly, all gasoline engines require just the right amount of air to mix with the fuel so it burns properly.
The majority of people face issues with the chainsaw bogging down. Apart from this, issues like a clogged air filter, fouled spark plug, a saw that does not run smoothly or start are all related to a whacky carburetor.
What gets the right proportion of the fuel-air mixture?
A carburetor is basically a simple mechanical gadget in the form of a tube which works solely to get the right amount of air-fuel mixture.
So, read on and see all your questions being answered related to the working of the carb.
How Chainsaw Carburetor Works – Know When it Works its Magic
It should be noted that a carburetor works in a very simple way. Moreover, it works only under the following 3 conditions:
- It comes into action when you start a cold engine. A saw that has not been in use for a couple of hours.
- Also, it works when it is running very slow or idling.
- Last but not least, it comes into action when the engine is on full throttle.
1. What Makes Up the Carburetor as We Know it?
A number of components come together to make the carburetor.
Essentially, it is just a tube which is comprised of the following parts:
- Throttle plate: First comes a little adjustable plate made up of brass known as the throttle plate. It controls the flow of air inside the tube. When it is fully open, more air flows in. On the other hand, when it is fully closed, no air flows into the tube.
- Venturi: Next, down the tube comes a little narrowing known as the venturi and it makes a vacuum in the tube.
- Jet: Furthermore, in the venturi is a little hole called the jet. The jet lets fuel be pumped in the vacuum to mix with the air in the carburetor.
- Idle Jet: a little hole on the carb’s tube side.
- Choke plate
2. How Does it Actually Work?
You must be wondering how this air and fuel in the carburetor makes the saw go?
Well, for knowing How Chainsaw Carburetor Works all you need to do is look at all these working in synchronizations under 3 different conditions mentioned above.
All it does is that it accurately measures the amount of fuel that mixes with the air in the carburetor to make the engine of the saw work.
3. Work that Carburetor does under Normal Conditions:
Now usually, the carb runs at full throttle. Under these circumstances, the throttle plate comes parallel to the tube lengthwise. Consequently, maximum air flows into the carburetor.
Furthermore, it produces a fine vacuum for drawing in the maximum fuel to mix with the air.
Moreover, if you look closely, you see a little screw labelled as Hi. This lets you control the amount of fuel flowing in the venturi.
Here we need to talk about the Throttle stop:
This is the level of throttle valve which will remain open when you release the trigger. If it is too low, the engine will not start as the carburetor will not be able to give the appropriate ratio of air-fuel mixture to the engine.
Likewise, if the adjustment is low, the engine will start for a second and die again.
4. How Does it Work When it is Idling?
In this situation, the throttle plate starts to close partly.
Consequently, sufficient air does not come in through the venturi. Moreover, it is not sufficient to create the vacuum required. Hence, the airflow is restricted.
On the other hand, there is a large vacuum on the other side of it. Here, this vacuum draws in more fuel from a tiny hole known as idle jet.
Here also you can see a little screw marked Lo. This lets you control and adjust how much fuel will flow in from the idle jet.
5. What Happens When the Engine hasn’t been Used?
When you try to start a cold engine or are starting the saw after a long time duration, it needs more mixture to work that engine.
Therefore, high consistency of mixture can also lead to choking of the carburetor. In turn, it chokes the engine.
How can we get around this glitch?
Well, in this case, the choke plate comes into play.
In the face of a cold engine, the throttle opens fully and the venturi is fully covered. As a result, a large amount of fuel comes in the carburetor through both the idle and main jet.
Usually, this results in the firing of the engine, or it runs slowly.
Here, the choke plate comes into action and makes the running of the carburetor and engine smooth.
Without a doubt, you need to have full knowledge of How Chainsaw Carburetor Works? As it is critical to the overall efficiency and performance of the saw.
Learning how the throttle plate, venturi, jet and idle jet work together to make the carburetor work is very important and has been explained in detail here. No more worrying about a carburetor that chokes or does not perform well.