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Need to know low and high air screw adjustments

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Turn both of them in all the way then back them out one turn. This should let you start it. Then turn the high air screw clockwise until it begins to stall, then turn it counter-clockwise until it begins to stall. Then turn it somewhere in between the two where it sounds smooth. Same with the low.

Posted on Apr 28, 2010

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How do you adjust and which screw is the Idle air mixture screw?


The idle screw is the largest of the three and will generally have spring on it and it will be above the low and high adjusting screws. Turn the idle screw clockwise to increase idle speed. But before you do that, adjust the low and high settings to one full turn out.

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1 Answer

Craftsman chainsaw will not keep running


Most saws will have a high, low and idle screw adjustments.

First make sure we are dealing with a clean air filter, clean with air or tap air filter and brush to remove saw dust. Replace fuel if it is a season old or older. (Fuel filter replacement if it has seen years of use.)
2nd GENTLY turn the high screw clock wise until it bottoms out and then counter clock wise 1 and a quarter turns.
3rd do the same for the low idle.

It should run and idle at this point, let it warm up before making final adjustments. If it dies when giving it gas then more than likely it will need further adjustment on the low idle screw.

If it is really stubborn, often times the the ports are full of sludge from the bad fuel. I prefer to remove the bar and chain especially for the novice. Start the saw, secure with another set of hands if need be, turn the idle screw in to quicken the speed a little. Now you can work the low and high screws back and forth 1/4 turn while the saw is running, periodically giving it full throttle. That should be enough to dislodge buildup replace bar and chain and then your final adjustment.

If not you may have to look else where as in an air leak.

Good luck and be careful!
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1 Answer

Carburetor air screw adjustment


Hi Hya
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
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Bud

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1 Answer

Need to tune sthil fs74 line trimmer


Hi chris tanti
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Please take time to rate me
Bud

Oct 13, 2012 | Stihl Garden

1 Answer

How do you adjust the idle on th poulan p3314 gas chainsaw and is there a special tool you need it just wont idle


Most poulan chain saw have three screws idle, high, and low.. if you look air filter cover you will usually see three holes and the high and low will usually have plastic covers on it.. adjust the low 1/4 of a turn and the idle screw in about 1/4 or until the idle picks up... On the plastic cover where the three holes are you will see H which is High L which is Low and I which is Idle... Let me know if you have any problems.. thanks

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1 Answer

I would like to get the proper settings for my low and high fuel jet screws on my 371k chain saw motor


theres no exact setting to use. and they are high and low air screws. the small flat head screw by the throttle lever on the carb is for fuel. but the best way to figure it out is to turn both air screws all the way in and the back out 2 and 1/2 turns. that a good starting point. from there adjust the low with the saw ideling till it sound good and the adjust the high with the throttle wide open till it sounds good.

Jul 08, 2011 | Husqvarna SM 125 Motorcycles

1 Answer

What is the air-gas settings on the carb?and which is the gas or air?


Hi windsordew67...
Normally the larger of the two screws is the fuel needle, the smaller of the two is the air needle.
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
Normally you will adjust your idle jet to 1/2 to 3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2 to 1 3/4 open from the bottom seated position, after the engine is warm. Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
But always use the "lightly seated" method if you have not changed the settings.
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Jun 16, 2011 | Ryobi Garden

1 Answer

How to adjust idle on McCulloch Mac 2214av chainsaw


Look for 3 adjustment screws on the carb. should be three total. 1 screw is for idle adjustment. the other 2 should be close to each other, one is low speed fuel/air mix and the other is high fuel/air mix. Adjust the low fuel/air mix screw until it will idle un-added with the throttle then adjust the idle on the throttle to get a good idle speed. Next adjust the High fuel/air mix until it gets the RPM's you want it to have. It should go from idle to high speed with out hesitation or cough. . Start with 1 1/2 turn out from all the way in. Be sure the filter is clean, You can use starting fluid or old school lighter fluid to aid starting if has been sitting for some time.

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1 Answer

Need to set low level on my compressor


That would depend on the type of pressure control switch it had on it, but all of the ones I've ever seen have it near the high pressure adjuster under the pressure switch cover- VERY HIGH VOLTAGES- RISK OF INJURY OR DEATH- UNDER PRESSURE SWITCH COVER WITH UNIT STILL CONNECTED TO POWER-

On the common switch used (A condore mdr 5) the differential is adjusted by DEPRESSING the nob & turning it.

On MDR 4 the adjuster is directly behind the high pressure adjuster. it is a flat bladed screw attached to a spring-screw in to increase cut in pressure.

You can also get pressure switches with a higher cut in pressure.
In Australia from a company called Ross Brown Sales in N.S.W

Hope this helps
Regards Andrew

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2 Answers

I have a hb180 homelite leaf blower and want to know how to adjust the 'two' little screws on the side and what they do


if its the carb screws your talking about
one it for fule mixture the other is for air,,,
air for tickover fule mixture for rev's
if its running well leave them be?

Oct 30, 2009 | Garden

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