A chainsaw is a technically sophisticated tool that needs to be serviced from time to time. Cleaning, replacing filters and, of course, adjusting the carburetor of the chainsaw will help to serve the entire life set for it. In this article, we will consider the issue of carb settings. How and why it is carried out.
Situations in which adjustment is necessary
New chainsaws are supplied from the manufacturer with adjusted carburetors. This is called standard adjustment. But for the normal passage of the break-in process, it is necessary to lower the maximum engine speed, to adjust the carburetor. After running in, the chainsaw needs to be fine-tuned to achieve maximum engine efficiency.
Also, a signal for cleaning and adjustment is increased fuel consumption, which negatively affects the operation of the exhaust system. Simply put, the chainsaw begins to smoke very much and the muffler becomes clogged with carbon, which in turn will lead to a decrease in power. With a lack of fuel in the mixture, engine parts are poorly lubricated, and premature wear occurs. Also, a poor-quality mixture can cause the engine to jam due to overheating (this is one of the reasons why the chainsaw does not start).
Adjustment is necessary when the engine does not keep idle, stalls or does not develop full power.
The carburetor must be adjusted with clean air and fuel filters.
Correct adjustment of the carburetor of the chainsaw should be carried out using a special tool. a tachometer. It allows you to most accurately determine the maximum number of engine revolutions and adjust them according to the requirements of the manufacturer. To adjust, you need to have a small slotted screwdriver. For some models of chainsaws, you will need a special adjustment key, without which it is impossible to carry out work.
The key for adjusting some carburetor models is available only in service centers authorized by the manufacturer for the repair of chainsaws. This measure is aimed at reducing damage due to improper settings by inexperienced users and those involved in the repair, without official permission to do so.
Setting up the chainsaw should, if possible, be carried out in official service centers that have a certificate from the manufacturer.
How to adjust the carburetor
Video: No Idling On Chainsaw
The algorithm for setting up the chainsaw is quite simple and consists of the following steps:
- Adjustment of the engine for smooth operation at low speeds.
- Setting the carburetor to the correct flow of the fuel mixture at maximum speed.
- Fine carburetor adjustment for idling.
- Checking the chainsaw in all modes.
The carburetor must be adjusted after the engine has run a little and warmed up.
Now we will consider how the correct adjustment of the carburetor of the chainsaw goes in more detail. Almost all carburetor models have three adjusting screws. The screw (T) is responsible for fine tuning in idle mode. Screw (H) setting for maximum speed. The screw (L) controls the formation of the mixture at low speeds. By tightening the screws (L) and (H), the fuel supply and the mixture are leaner, respectively, revolutions increase.
If the carburetor of the chainsaw is not adjusted, and it is not possible to start the chainsaw, then the setting is started by setting the screws (L) and (H) to the standard setting. This is 1/5 turn of the screws until fully tightened. After which, it is necessary to start the engine, let it run for a bit and warm up. The next step is setting the low speed mode. Optimum engine operation at the “bottom” can be achieved by adjusting the screw (L) and idle speed (T). To do this, first screw (L) is tightened until the maximum engine speed is obtained, then it is released by 1/4, and the screw idle is normalized by screw (T).
After adjusting the work on the "bottoms" is the adjustment of traction and maximum engine speed. To do this, slowly tighten the screw (H) and check the speed using the electronic tachometer.
exceeding the maximum engine speed declared by the manufacturer is unacceptable.
An important step is to check the saw in all operating modes after adjusting it, for this you need to let the chainsaw cool, and then start according to the cold tool start algorithm. If the saw starts up normally and is idling smoothly, you need to check how it saws. If in the process of checking deficiencies in the power of the chainsaw are found, it is necessary to repeat the adjustment of the screw (H) by unscrewing it and checking the traction in operation.
loss of traction at maximum speeds recommended by the manufacturer is an indicator of CPG wear or poor fuel quality.
Carburetor adjustment for Chinese chainsaw
Carburetors mounted on Chinese-made saws are made similarly to European ones and have the same tuning screws.
The carburetor of the Chinese chainsaw is adjusted according to the algorithm presented above, and is distinguished by the fact that during the initial adjustment of the screws (L) and (H) they must be turned out two turns. Further, the carburetors of the Chinese saw are regulated in the same way as the European ones.
The setting of the carburetor of the saw can be studied in the video below. In this video, the wizard shows how the step-by-step adjustment of a Chinese-made chainsaw is performed without using a tachometer. Carries out after adjustment check in various modes.
Adjusting the carburetor of the chainsaw, although it seems a fairly simple process, but requires a very careful and responsible approach. The article describes the process in sufficient detail, however, if you have never regulated a chainsaw, it is worth contacting specialists, this will help save time, nerves and money.