Question about Husqvarna Forest & Garden 125l 18" Gas Trimmer

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How to set the jets on a 125 weed trimmer. The revs are too high and adjusting the idle screw makes no difference.

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The idle screw is just that, for idle. The second screw is for high speed. I'm not real familiar with this motor. Try turning the second screw in or out slowly but not to far, you'll want to make sure you still maintain good throttle response. Hope this helps

Posted on Apr 26, 2010

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1 Answer

WEED TRIMMER CARBURETTOR ADJUSTMENT


Three screws. On some, there are only two screws. Some have only one screw. A few have none at all.

If there are any screws, one is nearly guaranteed to be an idle mix adjustment. With the engine warmed up & idling, turn that screw in (clockwise) 1/4 turn at a time until you can hear the idle speed drop a little. Back it out 1/4 turn and leave it alone. If the first 1/4 turn drops the idle speed, turn it OUT 1/4 turn and see if the idle speed rises more. When you get idle speed that stays the same when you make a 1/4-turn adjustment, go back to the beginning if this paragraph and repeat the first part.

If there are two or three screws, the next screw may be either an idle speed screw or a high mix screw. If it's an idle speed screw, turning it in 1/4 turn will immediately RAISE the idle speed and turning it out will LOWER the idle speed. Adjust that screw until the string head (that cuts weeds) isn't quite turning at engine idle. If it's a high mix screw, its only effect will be at full engine speed. If the engine sounds throaty, turn that screw in 1/4 turn at a time at full engine speed At some magical point, the engine sound should turn brassy. If you turn the screw in past that point, the engine will lose power because it's running too lean.

If there are three screws, then you have all three - idle mix, idle speed, and high mix.

There may be markings near the screws to identify them. Each manufacturer marks them differently, if at all. Some manufacturers simply rely on the screws' locations to indicate what they do. It'll be up to you to figure out which is which and make notes accordingly.

Aug 01, 2014 | Ryobi Garden

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 many turns out is the factory setting on the high and low needles


Hi stanw71
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 | Husqvarna 128LD 17" Gas Trimmer

1 Answer

How to adjust carburetor settings


Hi Norberto Mora
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 10, 2012 | Toro 2-Cycle 25.4 cc Straight Shaft Gas...

1 Answer

What are the carb settings for ryobi rct 2800 cb trimmer ,they have been adjusted so the correct position of the screws is not known


Hi peter beaufoy...
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

Sep 20, 2012 | Ryobi Garden

1 Answer

What is the high / low carburetor adjustments and the fuel mixture for the UT21566 Homelite trimmer


Hi dcheddy...

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 tried to adjust them already then this should get it running...then do your final adjustment when the engine is 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.
Free Answer...Please take time to rate me

Jul 09, 2011 | Homelite Mighty Lite Lawn Trimmer

1 Answer

How to adjust carburator on weed trimmer


Hi bobbiewil512..

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 bottom the 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 bottom seated position to open when you go to replace them, if you remove them for cleaning or replacement.
Normally you 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.
The high speed jet is normally adjusted when the engine is warm to 1 1/2- 1 3/4 open from the bottom seated positon.
Then re-adjusted by turning the High Speed adjustment screw in or out till the motor runs smoothly at high speed.
Free Answer...Please take time to rate me

Jun 06, 2011 | Garden

1 Answer

It runs normally at high revs but dies on idle


the units came out with EPA carb's some have idle screw adjustment and preset high jet, or the other way depending on the unit. try and change the fuel, use only high octane fuel for 2 cyc no ethanol with fresh oil mix, run for about 5 to 10 min's. if your carb has adjustment screws set your low side idle screw but still change the fuel.

Sep 03, 2009 | Homelite Mighty Lite Lawn Trimmer

1 Answer

What are the factory settings for the "Hi" & "Lo" Carb Jets for the Husqvarna 125L (Weed Trimmer). 1 turn out, 1/2 turn out, etc. Can't get to idle at all, have idle screw all the way in and does...


find L on your carbruetor and turn it clockwise 1/4 turn to see what difference it makes
it should begin to idle by itself?
zama carb. 1 turn out from closed
walbro 1and 1/4 from closed settings are only preliminary

Jun 14, 2009 | Husqvarna Forest & Garden 125l 18" Gas...

1 Answer

Need to adjust fuel and air mix to start trimmer.


Hello gwturley201:

I am Including the Carburetor Adjustment File Also.
From your Description it Sounds like the Exhaust Port or Muffler is Restricted with Carbon Deposits, the Carburetor Metering Pump Actuator Gap is Incorrect.
>>The Following is a Basic Instruction File for Doing a Diagnostic on the Engine for this Problem. Any Input is Appreciated.
>>**Remove the Muffler and Make Sure the Exhaust Port is Clear.
>>If it is, then Try to Start the engine with the Muffler Off.
>>If it Starts and Runs Properly, then Clean the Spark Arrestor Screen in the Muffler or Replace the Muffler if Required.
Is the Fuel Line from the Fuel Filter Staying Full of Fuel?
The Carburetor Metering Jet Actuator is Set so the Pump Diaphram Dowl is Just Touching the Actuator Arm. These Components are Located Under the Cover with 4 Small Screws Holding it to the Carburetor Body.
>>The Following is the Instruction File for Setting the Air Mixture Screws. Any Input is Appreciated. The Procedure is the Same for 1 or 2 Mixture Screws, Just Use the Instruction File and Skip Over the Section with the Missing Mixture Screw ( Usually the H Mixture Screw).
>>Now Setting the Air Mixture Screws:
>>****Turn the Idle Air (L) and Main Air (H) Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Set the Throttle Full Open, Start the Engine.
>>Turn the Main Air (H) Mixture Screw Clockwise Until Proper Revs are Obtained. **Carefully Use your Finger and Move the Governor Arm to Rev the Engine (on Chainsaws and Trimmers Use the Trigger to Rev the Engine) Until you Reach Max RPMs (on Chainsaws and Trimmers, the RPMs are Not Set to MAX. Set to Max and then Reverse the Setting Screw 1/4 or 1/2 Turn. If the H Mixture Screw is Set too High; the Engine will be Starved for the Oil in the Gas and Damage the Piston and Jug/Cylinder) and the Engine is Running Proper at Full Throttle Up a Grade or for Chainsaws and Trimmers; they Operate without Bogging Down. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs.**
>>Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required.
>>Now Set the Idle Air (L) Mixture Screw so there is No Hesitation when Rapidly Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.****
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)

May 13, 2009 | Craftsman Garden

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