The LA setting on Stihl chainsaws is controlled by a screw on the outer housing of the engine that adjusts the flow of fuel and air through the carburetor. This screw is inside the engine housing on the carburetor, but is accessible through a hole or gap in the outer housing of the saw.

Also asked, what does LA mean on a Stihl chainsaw?

low speed air adjustment

Also Know, why does my chainsaw dies when I give it gas? Carburetor Adjustment

An engine stalls when it's getting too much or not enough fuel from the carburetor. Stihl chainsaw carburetors usually have three adjustment screws: one each for idle, low speed and high speed. If the saw stalls while it's idling, adjusting the idle screw, which usually is marked LA, should help.

In this way, how do you adjust the carburetor on a Stihl chainsaw?

Carburetor Adjustment Procedure

  1. Before you start the saw, locate a small flat-bladed screwdriver.
  2. Begin by checking the saw's air filter.
  3. Check the fuel level.
  4. Start the engine and warm it up.
  5. Begin by setting the idle speed.
  6. Set the low speed fuel adjustment.
  7. Go back to step (4) and reset the idle speed.

What does H and L mean on a chainsaw?

"On every saw the "h" means that's the "high" side adjustment. It regulates the fuel/air mixture that is being passed into the motor during high rpm's. The "L" means that's the "low" side adjustment. It regulates the fuel/air mixture that is being passed in the motor around the low rpm's"

Related Question Answers

Why does my Stihl chainsaw bog down?

The Job of the Carburetor

Without the right amount of air and fuel in the piston cylinder, the 2-cycle engine in a Stihl chain saw runs inefficiently and the saw loses power. When the saw bogs down during cutting, it's usually the high-speed screw you need to adjust.

How do you date a Stihl chainsaw?

Call Stihl customer support at 800-610-6677. Give the customer representative agent the serial number and they, in turn, will be able to look up the year the saw was made.

How do you adjust the high and low on a Stihl chainsaw?

They are the high-speed, low-speed and idle adjustments respectively. Determine the carburetor type before adjusting the high- and low-speed screws. To do this, turn the "L" screw clockwise as far as it will go, using a flat-head screwdriver, then turn it counterclockwise as far as it will go.

Where is the high speed screw on a Stihl chainsaw?

This screw is inside the engine housing on the carburetor, but is accessible through a hole or gap in the outer housing of the saw. On Stihl models with adjustable carburetors, the LA screw is accompanied by the L and H screws. These screws adjust the engine's output at low and high speeds.

Why does my chainsaw dies at full throttle?

If your chainsaw engine dies at full throttle, check the following parts: the carburetor, fuel lines, fuel filter, air filter, and muffler. When the carb becomes clogged (which is often the result of old fuel sitting in it over a long period of time, like over the winter), it will not perform this task effectively.

How do you adjust the carburetor mixture on a screw?

Locate the idle mixture screw and turn it clockwise until the needle lightly touches the seat. Then, turn the screw counterclockwise 1-1/2 turns. If your carburettor has a main jet adjustment screw at the base of the float bowl, turn the screw clockwise until you feel it just touch the seat inside the emulsion tube.

How do you adjust a carburetor?

Carb Quick Guide
  1. Verify carburetor is set to stock settings:
  2. Start bike, bring to operating temperature.
  3. Set idle speed adjusting screw, clockwise to increase rpm, counter-clockwise to decrease rpm.
  4. Adjust idle mixture by turning idle mixture screw slowly clockwise until the engine runs poorly.

Why does my chainsaw start and then stop?

The carburetor might be clogged. A clogged carburetor is often caused by leaving fuel in the chainsaw for a long period of time. This sticky fuel can clog up the fuel filter and cause the engine to stall. If old fuel was left in the chainsaw, drain the old fuel from the fuel tank and replace the fuel filter.

What are the two adjustment screws on a carburetor?

There should be two screws on the front of the carburetor, which are used to adjust the air and fuel mixture. Often these look like flat-head screws and you can use a screwdriver to turn them, adjusting the amount of fuel and air mixing in the carb.

How do you adjust air fuel mixture screws?

Set the idle screw so that the engine is idling at a normal RPM. Take a small screwdriver and start turning one bleeder screw on one side of the carb inward until the idle either drops or rises. If it drops, you are going the wrong way, so turn it the other way until the you hear the engine's idle rise back up again.

What do the screws on a carburetor do?

Once the air filter has been removed, and the carburetor is exposed, locate the air fuel mixture adjustment screws, these are often plain, flat head screws. These screws are responsible for controlling the amount of fuel that enters the engine, and improper adjustment will result in decreased engine performance.

What is the T screw on a chainsaw?

The T screw regulates how much fuel is sent to the carburettor while idling until the throttle is pressed. L Screw - With the chainsaw still running, take a screwdriver and turn the L screw clockwise. Keep turning it until the engine almost stops turning.

How does idle mixture screw work?

Once the air fuel mixture screws have been properly adjusted, and the engine runs smoothly both at idle, and when revved, it is time to locate the idle mixture screw. The idle mixture screw controls the air fuel mixture at idle speed, and often is located near the throttle plate.

Why does my chainsaw idle fast?

The most probable -- and easiest to fix -- cause of chain rotation while the chainsaw engine idles is a poorly adjusted idle setting on the carburetor. The result is that too much fuel is delivered to the combustion chamber when the throttle is released, and the engine doesn't really slow.

How do you lean a carburetor?

The first thing to do is not set up the idle speed, but to set the Idle mixture screw to lean best idle setting. First, turn in the mixture screw until the engine dies or runs worse, then back out the screw (recommend turning ¼ to ½ turn at a time). The engine should pick up speed and begin to smooth out.

Why does my 2 cycle engine stall when I give it gas?

When a weed eater starts okay but dies when throttled, it often indicates that there is restricted fuel flow. A fuel filter can get clogged with impurities to a point that it allows a small amount of fuel through (enough for starting and even idling) but won't let it through at a rate sufficient to rev up.

What happens when you run straight gas in a chainsaw?

If you've put straight gas in the fuel tank, don't start the engine. If straight gas is used, it can damage and ruin the piston and crankcase within a minute, as the gas doesn't take long to burn out these sensitive parts. Drain the tank immediately into a separate fuel container.

Why does my chainsaw only runs on choke?

If your chainsaw only runs with the choke on, it is likely an issue with your carburetor. However, if the engine is plugged, the choke will pull more fuel through the carburetor's idle circuit and allow it to run. When the choke is turned off, the engine will die.

What does it mean when your chainsaw smokes?

While a chain saw does produce some heat while in use, it should never overheat or begin smoking. The most likely causes of smoking and overheating are a lack of air and/or a lack of lubrication to the engine or the chain saw chain guide bar.

How do you fix a chainsaw that won't stay running?

Why Won't My Chainsaw Idle?
  1. Make Sure Choke is Off.
  2. Air Filter Clogged.
  3. Bad Gas.
  4. Fuel Line and/or Filter Clogged.
  5. Fouled Spark Plug.
  6. Primer Bulb is Clogged or Leaking.
  7. Idle Ports are Clogged.
  8. High/Low Screws and Adjustment Idle Screw Needs Calibrating.