You may notice that in addition to the chain not stopping the chainsaw has other symptoms, such as smoking and the engine racing, which can be caused by a rich fuel mixture. Achieving better performance from the chainsaw may be possible by adjusting its low-speed carburetor screw – usually marked “L” or “LA” – to create a slightly leaner fuel mixture. A dirty air filter also can be responsible for an overly rich fuel mixture.
Just before we look at the most likely reason your saw won’t idle, we’ll need to check some of the basics, and I’ll fill you in on why they’re important, or if you want to skip all this, go ahead and slide on down to the “Adjusting the idle screw” below. If the chain is moving while the saws idling, then back the idle screw out a 1/4 turn until the chain stops, this fine-tuning can now be done with the saw idling. If the saw still won’t idle, you have cleaned the air filter, got fresh gas mixed correctly, the plug is clean & gaped, and adjusting the idle screw hasn’t worked.
The correct carburetor adjustment will allow the saw to produce maximum power, extend the duty cycle of the engine, produce minimal smoke, idle smoothly, rev up nicely and give trouble free service. High Speed Fuel Adjustment – This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at cutting speed. If carburetor adjustment is required due to a new or rebuilt carburetor, it is best to start with the fuel adjustment settings one turn out.
why does my chainsaw idle fast Related Question:
What causes a chainsaw to idle high?
What is this? Surge is caused by erratic air leakage into the engine or the fuel unable to flow to form the air-fuel mixture. The air turns the air-fuel mix lean, thus further increasing the engine RPMs and its temperature. It’s not safe to run your chainsaw if it surges, as this may score the piston cylinder.
Why does my chainsaw bog down when I give it gas?
If your chainsaw is bogging down when you give it throttle, this is often a sign of improper gas-to-oil ratio. If there is too much gasoline in relation to the amount of oil used, this is known as a “rich mixture” and can cause the chainsaw to run poorly.
How do I know if my chainsaw is running rich?
If the chainsaw is low to get to idle, it probably works under higher rpm, which is a clear indicator that you’re running lean. On the other hand, if your engine is too loud and you feel like the saw is overheating, you’re probably running rich.
How do you adjust the H and L on a Stihl chainsaw?
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.
Is seafoam good for chainsaws?
At Sea Foam, we recommend overcoming saw starting issues by adding 2–4 ounces of Sea Foam Motor Treatment to a low tank of fuel, running it for about five minutes, then letting it sit a night or two to soak or clean. Add fresh fuel and proper two-stroke oil before operating and it’ll be good to go.
How do you start a stubborn chainsaw?
Try to start the chainsaw after priming the carburetor. 5. Activate the choke by moving the lever to the full choke position and pull the starter rope 3 or 4 times to start the engine. If that doesn’t work, move the choke lever to half choke and pull the starter rope, 6 times maximum, to start the engine.
Why does my chainsaw spark?
The most common cause of sparks from a chainsaw is metal-on-metal grinding. Whether it’s cutting through wood that has a nail in it or a grinding of gears in the chainsaw housing, a metal-against-metal grinding is the most likely cause.
Can you clean a chainsaw fuel filter?
Brush the air filter gently with a soft brush or wash it in warm soapy water then dry it. Do not use compressed air to clean it – compressed air can blow holes in the filter, allowing dust and debris into your carburetor.
Why does my chainsaw bog down when I pull the trigger?
The reason for that may be you’re using the saw at altitude or the carburetor adjustment has simply slipped. The saw also won’t operate well at speed if the air filter or spark arrestor or carburetor are dirty.
What is a Stihl 311y?
The MS 311 is a high-tech workhorse with a step up in horsepower and features over the MS 291. With our improved engine technology, you get higher fuel economy for longer run times. The MS 311 also has larger fuel and oil tanks for even longer extended use. You’ll stay productive – while you’re saving money on fuel.
What is the LA screw on a Stihl chainsaw?
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.
Can you clean a chainsaw carburetor without taking it apart?
To clean a carb, you have to take it apart. If it needs cleaning, the parts that need cleaning can’t be seen from the outside.
How do you clean a carburetor without removing it?
To clean a motorcycle carburetor without removing it, you’ll need to remove the bowls at the bottom of the carburetor. Once the bowls are removed, spray some carburetor cleaner up inside, wait a few minutes, then spray again to ensure coverage. Then replace the bowls and start the motorcycle to assess how it runs.
Can you spray carb cleaner in chainsaw?
You can use Sea Foam Spray to clean your chainsaw carburetor effectively. Sea Foam spray has a petroleum cleansing solvency. And adds lubricity to various components of the carburetor. It is a fine cleaning agent for chainsaw carburetors.
Can you spray starting fluid in a chainsaw?
Removing the air filter, spraying starting fluid into the carburetor and pulling the starting rope is another quick way to clear out the engine. Starting fluid creates a leaner fuel mixture that ignites more easily, and the operation of the engine clears out the combustion chamber automatically.