If you have a new saw, this won’t apply to you, as new regulations require saws to be built so that only a qualified technician can tune the carburetor. If you have an older saw, here’s how to quickly tune it yourself. Less than five minutes of your time can make a big difference in how well your saw runs.
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.
how to adjust chainsaw idle Related Question:
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.
Why is my chainsaw idling high?
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.
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.
Why does my chainsaw stop when idling?
Blocked or damaged Idle Port – Check the idle port Oil, dirt, and debris can block them, preventing the air from flowing into the engine. If the idle port of your chainsaw gets blocked or damaged, your chainsaw won’t stay running. Check the idle port for damage or blockage.
Why is my chainsaw revving on its own?
If your chainsaw is over-revving, it indicates a lean air-fuel mixture is supplied to the engine. The carburetor might need tuning, or there might be an air leak behind this. Clean the air filter and adjust your carburetor’s screws that control the amount of fuel in the fuel mix.
Why does my Stihl chainsaw not idle?
Firstly, the air filter might be clogged. Secondly, a jammed-up spark arrestor can be a cause as well, this is a result of putting excess oil in the gas-oil fuel mix. Corroded electrodes of spark plugs could be another problem. The rest of the article will show the reasons behind the Stihl chainsaw not idling.
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.
Why does my chainsaw only runs on choke?
When your chainsaw only runs if the choke is on the problem, in most cases, is a result of fuel supply problems or a faulty carburetor. To fix the problem you should check and clean the fuel system and carburator.
What is the H and L on a carburetor?
They are typically labeled L (low speed jet), H (high speed jet), and I (idler jet).
What does H and La mean on a Stihl chainsaw?
One marked “H”, for high speed, one marked “L”, for low speed and one marked “LA”, which is your low speed air adjustment for idle.
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.
How do you adjust the idle on a Stihl 026?
Start the saw and run it to warm it up with the bar and chain on it. With a tach, set the idle to 3300 RPM. Then turn the L screw in or out to get the highest idle speed. Reset the L/A to 3300 RPM again, and redo the process until you get the highest idle from the L screw.
Why does my chainsaw stop running after a few minutes?
Re: chainsaw shuts down after a few minutes Sounds like a fuel supply issue. Fuel line, fuel filter, carb diaphragms, impulse hose, plugged carb screen, bad fuel, etc.