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My stihl fs120 single screw model, what is correct method of mixture screw adjustment

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Https://www.youtube.com/watch?v=4SN89-x-M88
youtube has a ton of info on the STIHL

Posted on Dec 30, 2018

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5 Suggested Answers

Anonymous

SOURCE: STIHL CHAINSAW MIXTURE SETTINGS

one turn high and low 66 has compesator carby willrun rich up high but will lean under load

Posted on Sep 03, 2008

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Anonymous

  • 1 Answer

SOURCE: ryobi 31cc lawn trimmer carb adjustment

As with all 2 strokes if you have compression and a reasonable spark, you only need fresh fuel with correct oil ratio) and they must go !(as long as you haven't fiddled first and all gaskets are sealing) I start mine by(1) pumping the primer till it is firm,(2) full choke,(3) pull till it kicks ONCE,(4) half choke, pull till it runs,allow to warm up and(5) switch to run (you may need to apply a bit of throttle while pulling as in (4)(or give it a few more pumps if it dies) If all is ok, check that when properly warmed up there is a smooth transition from idle to full revs, if it hesitates it may need the LOW SPEED mixture leaning (clockwise) SLIGHTLY.If it dies the LOW SPEED mixture may need richening(anti-clockwise)(adjust 1/8 turn at a time) Make sure that motor is just peaking at full revs and is on the RICH side of peaking (HIGH SPEED mixture)(this will avoid seizing it Adjust both till it revs cleanly and is JUST rich at full, and idleing nicely and it should start without too much trouble.(If you have fiddled and are lost,-about 2 1/2 turns out from closed on both needles should get you started)

Posted on Nov 24, 2008

motor1258

Mike Butler

  • 6674 Answers

SOURCE: I don't know where the air/fuel mixture screw is on my carb

There should be one screw (I'm assuming it's the Carter YF carburetor 1 barrel) that's by itself away from linkages etc, more to center at base of carb where it meets manifold, that is angled approx 45 degrees going in to base. That should be your mixture screw. What symptoms are you experiencing anyway?

Posted on Apr 04, 2009

rpenningt79

  • 8 Answers

SOURCE: What is the correct fuel mixture for this machine

Every Stihl I have ever touched requires 40:1 fuel mixture.

Posted on Jun 02, 2009

Anonymous

  • 1 Answer

SOURCE: stihl chainsaw

I have a stihl ms 180 that leaks bar oil all the time

Posted on Aug 11, 2009

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1 Answer

Adjust idle on stihl chain saw


adjust it at the throttle end on the carby
if you have the correct tool you can adjust the idle mixture as well

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it may need the metering screws adjusted to maintain the correct mixture at open throttle
Take it in to a Stihl shop for a diagnosis and quote

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I would like a service Manual for a Stihl FS 120 brush cutter


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Turn the High mixture screw out 1 1/4 turns from fully seated position.
Turn the Low muxture screw out 1 1/2 turns from fully seated position.
Make sure that your fuel mix is 50:1 and that your Air Cleaner and Spark plug are clean.
If your Stihl is still not running correctly, clean your exhaust screen and muffler thoroughly as this can cause performance issues if not clean.

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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

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1 Answer

What do you mean by LA in the chainsaw?


Locate the adjustment screws near the carburetor labeled with an "H," an "L," and an "LA." The "H" screw adjusts the high speed fuel-air mixture; the "L" screw adjusts the low speed fuel-air mixture; and the "LA" screw adjusts the idle speed.

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1 Answer

There are three adjustments to the carbureter of the stihl wipper snipper model F585AV. One being the idle adjustment. one of the other two is the mixture adjustment. Question is, which is the mixture...


Low idle speed is one and high speed screw is the other. The idle screw is usually the one located closest to the throttle plate (closer to engine)

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