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How far does the high and low screw need to be unscrewed or screwed in on the carburetor. of the chair saw

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The position of the screws is set while the motor is running, The screw nearest the cylinder is the low speed adjustment and the other is the high speed adjustment. Start the engine and adjust the slow screw till the motor idles smoothly without wanting to cut out. Then open the throttle and adjust the other screw till the engine runs at a good, steady speed without over revving. If the setting of the screws has been totally upset, start with the screws about 2 turns out from the stop and work from there until it starts and runs, then you can set the optimal running settings.

Posted on Mar 26, 2011

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Saw will start but will not idle


Someplace near the carburetor should be an idle mix screw and an idle speed screw. There may also be a high-speed mix screw. Try turning the idle speed screw in 1/4-turn at a time until it idles. If you turn it too far, the clutch will always be engaged so the blade will never stop.

Once you get it to idle, adjust the idle mix screw in or out 1/4-turn at a time until it idles at the highest speed. Turn the mix screw in JUST until the idle speed starts to drop a little, then back it out 1/4 turn.

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When you buy a chainsaw the carburetor is set to run at sealevel basically. The fun thing about chainsaws is you can go to the top of the mountain and cut firewood. There is a lot of difference in elevation so the carburetor settings you use at your house might not run good at the top of the mountain so it is benificial to know how to quick tune your chainsaw.

You need to set the mixtures for the carburetor. There is usually a rubber grommet on the side of the housing near the carburetor. You will find a Low and High adjustment screw. The default setting for the H and L carburetor jet is usually to turn them in all the way till they stop and back them out a turn and a half. You should start the chainsaw and warm it up untill it will run without choking. Make sure that the air filter is cleaned. Start by turning the low adjustment screw out. You will notice that the rpms should start increasing. keep turning it out until the rpms start to drop then turn it back in a quarter of a turn from where it idled at the fastest rpm. At this point you may need to adjust the idle adjustment till the saw idles at a good speed but not fast enough that the chain turns. You may need to readjust the idle speed so the chain doesn't turn during idle. To set the high adjustment screw will require that you run the saw at max RPM. It may be a good idea to get someone to hold the saw so the bar doesn't hit anything while you're doing this. Hold the throttle trigger all the way down and then turn the high adjustment screw in and out until you find maximum rpm. Turn the screw back in a quarter turn. Your saw is now tuned for the elevation you're currently at.

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1 Answer

What is carburetor setting on a2.3 chainsaw


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There should be an idle screw on th carburetor labeled H and L for High speed idle and Low speed idle, adjust the screw to where it'll run....

I hope this helps....

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You need to reduce the minimum on your carburetor. Usually a chain saw has three screws to adjust. One is when you press the accelerator on the high revs. Then adjust the vividness of the saw. Another screw on the carburetor when the throttle is released and that the chainsaw works well at low revs. The third screw is the minimum and you can stop the chain here.
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1 Answer

What is h and l screws for we have been moving them around to try make the saw tick over as it keep cutting out


"H" is high speed and "L" is low speed. Turn both screws in full, then unscrew them one and a half turns each. Start the saw, you may have to adjust the trottle screw to keep it running.Then adjust the "L" screw a little, in or out, with the trottle screw until you are happy with it ticking over. then adjust the "H" screw to get it to run full. You need time and patience. Stephen.

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1 Answer

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You need to set the mixtures for the carburetor. You will find a Low and High adjustment screw. At idle turn the screw in or clockwise until the rps starts to decrease. Then start turning it out till you hit max idle rpms. Turn screw back in a quarter to half turn and it should be idling smoothly. Be careful here and get someone to hold saw if necessary but hold in throttle to full speed and do the same with high adjustment screw. turn it in till rpm starts to drop then back it out until you get to max rpm and it won't go any higher then turn it back in a half a turn.

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1 Answer

I have a craftsman chain saw model 358350280 i need carb adjustments i cleaned it but need to know where to start with screws one is red one isblue. thanks to all who help. dave


The screws are for high and low. Start by tighting the screws . Then unscrew both about 1-1/4 turns. Work on one at a time. Get the high adjustment dialed in first, then work on the low or idle.

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5 Answers

Husqvarna chainsaw carburetor adjustment


Find the 2 screws. There will be a (h) high and (L) low. These are for hig rpms and low rpms. First tighten the screws. Then unscrew them about 1-1/4 turns. Then start the saw and let it warm up. Start with the high rpms first pull the trigger all the way then adjust the screw in 1/8 turns either way until it is running good at high rpms. Then work on the L rpms. Get the saw to idle then pull the trigger, there should not be any hesitation when going from L to H rpms. Just adjust the low same as the High. They have to work together so if the high is good and the low is not just right turn the h a small amount. If you have any more questions let me know

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