With the development of gasoline powered tools, a chain saw with a gasoline internal combustion engine (ICE) appeared in almost everyone who lives in the countryside or has a cottage. Household models, semi-professional class tools and professional units, start up approximately the same. But not everyone knows how to start a chainsaw correctly. We will try to understand this issue and find out how to get a chainsaw.
Chainsaw Start Algorithm
In order to start a chainsaw, several processes must occur simultaneously. This is the supply of the fuel mixture under the engine piston, its maximum compression and the supply of sparks at this moment to ignite and start.
All these processes occur at the moment when we pull the starter handle. If you have a new chainsaw, then do not forget that it must be run-in.
But not everything is as simple as it seems, the fuel for starting in cold and hot engine mode should differ in the quality of the air mixture. For example, a hot ICE can start with a normal air level at which it works stably and confidently keeps idle speed. The same amount of air will be too much in order to start a cold engine, and before starting a chainsaw, you will have to pull the starter 10 times, or maybe more. How to solve this problem?
To reduce the amount of air and increase the fuel supply, manufacturers of chainsaws installed a special damper in the carburetor, which is responsible for the process of adjusting the amount of air at the time of starting the engine.
It is possible to start the saw engine with it several times faster, which increases the duration of the starter and the entire saw as a whole.
It is dangerous to start a saw in the place where it was refueled.
So how to start a saw? The start-up algorithm is as follows:
- Completely shut off the air damper. To do this, in all chainsaws, a special lever is installed, pulling which closes.
- Using a primer, pump fuel into the carburetor. This is necessary so that the internal combustion engine does not require several working cycles to fill the carburetor.
- Make a few movements with the starter until the first ignition in the cylinder. It is called the first flash. At this point we dwell in more detail because of its extreme importance for a proper start. It is at the time of the initial ignition that optimal conditions are created for the subsequent launch. Under the influence of temperature from the first outbreak, the fuel in the cylinder evaporates, forming gas vapors, and as everyone knows, they are involved in the internal combustion engine. Therefore, the next step is to complete the process, and finally start the chainsaw engine.
- Open the choke halfway and move it with the starter. After these actions, the chainsaw should start and start working at high speeds, to normalize them, press the control lever for the number of revolutions to the maximum and immediately lower it. After these steps, a properly adjusted engine will go into idle mode and reduce engine speed.
What happens if you do not open the choke after the first flash? The answer is simple, the carburetor will not reduce the fuel supply to the cylinder, and it will fill the spark plug electrode. After which, even a large number of movements by the starter, will not allow you to start a chainsaw.
Video: How to Start a Husqvarna 240 Chainsaw
Purge after violation of the algorithm
If you did not manage to start the chainsaw the first time, do not worry, this happens, most likely the problem lies in the excess fuel in the cylinder. It is necessary to carry out preparatory operations, namely, to remove fuel from the cylinder, and try to start again.
To fix the problem, you have to unscrew the candles and blow the cylinder. To do this, it will be necessary to turn the tool with the candle hole down, turn off the ignition button and make a few movements with the starter in this position. Due to compression, the engine will squeeze out excess fuel, after which you can try to start the saw with the damper fully open.
How to hold a chainsaw
To conduct the correct start of the chainsaw, an important point is how the saw is located at that moment, or rather, how the operator holds it. Two options for the correct holding of the saw at the time of starting are allowed.
The first option: the saw is mounted on a flat surface, the operator’s left hand is straight and holds the saw by the upper handle, the right leg is mounted on the protection for the right hand and presses the saw to the ground.
In this position, it is most convenient for the operator to start the tool, since the right hand is free and the tool is securely locked.
Before starting the saw, no matter what position it is in, it is necessary to apply the chain brake.
Option two: The operator stands, the left hand holds the upper handle of the saw, while the operator gripped the rear handle between the legs.
This position allows you to easily make a low-power saw, and at the same time reliably fix it, warning yourself against accidents.
Before you start a chainsaw, make sure that there are no people or animals in close proximity to it.
Watch a video on how to start a chainsaw and visually study the steps at startup below. In the video, a Stihl specialist talks about how to properly operate the tool and start it using the Stihl MS 211 chainsaw as an example. The video is very informative and contains reliable information from the manufacturer.
The answer to a popular question about the launch of a chainsaw
On the Internet, you can often find questions about how you can start a chainsaw without the help of a starter. The answer is simple. to start a chainsaw without a starter is impossible in principle. Manufacturers do not provide for any alternative starting methods, because even if you remove it and start the saw in some way, it will be impossible to work, due to violations in the cooling system. In it, a snail is installed, which transmits a stream of cold air from the flywheel impeller to the cylinder.
If you remove it, the engine will overheat and most likely will jam.
A method of starting a hot engine and an engine equipped with a decompression system.
A hot engine does not need to enrich the fuel mixture with air, so you can start a saw without closing the air damper. The ignition is simply turned on and the starter is moving, after which a serviceable chainsaw should start.
High-volume engines have quite serious compression, which extremely complicates the cranking process. To reduce the effort required to start the saw of large volume and power, manufacturers use special decompression valves, when pressed, the compression is noticeably reduced and the engine rotates more easily.
Valves can have a different look, so read the instructions for the tool in advance.
Thus, before any type of launch, whether hot or cold, it is necessary to press this valve, designed to reduce resistance, and thereby increase the service life of the starting device.
To conclude the article, you can summarize the key points of starting a chainsaw. First, you need to start with maximum safety. Second, any deviations from the startup algorithm are not allowed. And finally, a chainsaw without a starter can not start! Consider the information from the article and use your tool correctly.