Husqvarna Forest & Garden 125l 18" Gas Trimmer Logo

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Anonymous Posted on May 31, 2014

Husqvarna 2-cycle trimmer starts fine, idles fine, but won't run with the throttle open. it will rev up but any kind of load will just about kill it.

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Jack Youngblood

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  • Posted on May 10, 2022
Jack Youngblood
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My LD128 had the symptoms, starts an runs at idle and low speeds. Give it full throttle, and it starts to speed up, then die.
Tried all the fixes:

  1. Cleaned then removed spark arrestor. NO CHANGE.
  2. Changed spark plug. NO CHANGE.
  3. Replaced air filter, carb, fuel lines and fuel filter. NO CHANGE.
I noticed when adjusting the new carb the engine would spit and backfire. First indication of a timing issue.
Replaced ignition module, now it runs like a champ.

This is the first time in years of working on small engines that a timing/ignition problem was the problem.

Richard Haynes

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  • Husqvarna Master 673 Answers
  • Posted on Dec 12, 2017
Richard Haynes
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May need to have the unit checked. Could be something as simple as a clogged muffler, air filter, fuel filter or engine wear or damage.

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5 Related Answers

#1 Taper

Jim Parker

  • 1041 Answers
  • Posted on Nov 26, 2009

SOURCE: Husqvarna 323L Line Trimmer - Runs for about 5-10 seconds,

Check the fuel lines for cracks/breaks. If they are o.k., then:

Youwillneed to disassemble the carburetor and spray with carb.cleaner.Makesure the small screen is free of debris. (Should be able to seedaylightthrough it.)

Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152),to clean the small portals in carb. These portals can become blocked. Reassemble and start.

If the carb. parts are more than 4 years old, you may have to replace them.

If you need further assistance on:
1. Fuel line replacement or
2. Carburetor kit replacement

Just let me know.

Jim

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Anonymous

  • 42 Answers
  • Posted on May 17, 2009

SOURCE: Husqvarna 324LDx 4 cycle string trimmer. Have

Probably needs a carb kit, check main jet and main fuel inlet jet, is the spark crisp, fat and powerful, try running it with a borrowed coil as this may have an intermittent fault. Is fuel cap breather working or blocked, these small carbs are very sensitive. Make sure all is well with gaskets and diagrahms. Good luck the Yeti

panilling9

panilling9

  • 284 Answers
  • Posted on Jun 14, 2009

SOURCE: What are the factory settings for the

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

Anonymous

  • 28 Answers
  • Posted on Jun 23, 2009

SOURCE: I have a husqvarna 125L gas trimmer and dies after

Could be clogged gas cap. Take the cap off and see if you can blow air through it. If no air passes, the trimmer will become vapor locked and wont be able to get enough gas.

vincob

vince janis

  • 718 Answers
  • Posted on Jun 11, 2011

SOURCE: My brand new Husqvarna 128

Husqvarna is a good brand, if you are having trouble with running at full speed there is something inherently wrong with your unit you do not want to keep it around, it will lead to more problems in the future. I would recomend that you return it and purchase a Stihl they are very reliable if you want a machine that stands the test of time. Even a Weed-eater brand from Walmart will start better than the one you have right now and you will pay less or the same for a comparable unit, That will run great! Good Luck...

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Related Questions:

1helpful
1answer

Looks like oil and fuel is leaking or blowing from exhaust.

John - Husqvarna makes really good power equipment that seldom offers trouble. The unit you are talking about is a 2 cycle system, meaning you mix oil and gas together in lieu of having an oil sump at the bottom of the engine like 4 cycle motors have. First question, did you mix a bottle of One Mix 2 cycle oil to a gallon of regular gas to start off using your machine? If you did, then I would think your unit is badly flooded, which happens a lot with 2 cycle equipment. Try taking out the spark plug and see if the spark plug looks wet from too much fuel. If it is, leave the spark plug out for a day or so to allow the cylinder head to vent the gas fumes. Replace the wet spark plug with a new one and try to start the unit again. Here's a tip: If you do flood a 2 cycle piece of equipment (trimmer, chainsaw, blower, etc.) again, make sure the choke is off and hold the throttle trigger wide open. Pull the started cord several times until the unit starts to run. Keep holding the throttle wide open until it clears itself out. Remember, you run the equipment, it does not run you :-)
0helpful
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Weed wackier gas trimmer

didnt specify the make and model so generic answer ---check fuel mixture is correct --check the filter in tank is not plugging up--look for damaged / crack in fuel feed lines-look at spark plug --carb may need cleaning --exhaust port may need cleaning
Jul 04, 2016 • Garden
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Km90 starts but won't run on full revs

The KM90 is a 4mix engine that has valves. You may need to check the valve clearance, using the clearance tool.
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Won't run full throttle

try and clean the screen inside the muffler
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Poulan Pro PPB250E trimmer won't idle

clean and repair carb, make sure the mounting gasket is ok. and does not have a vacuum leak.
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High / low speed jets both turned into base completely, how many rotations out before fine tuning for performabce.

Hello:

>>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 and for Chainsaws and Trimmers they Do Not Bog DOwn Under a Load. 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 I Missed Something or 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 15, 2009 • Garden
3helpful
1answer

I need a manual for a homelite gas hedge trimmer HT-19 I need the factory settings for the carb. bottom out screw turn out 1 1/4 turn? Have to hold throttle wide open to run.

Hello cosorio70:

You can Get a Manual from the Following Site Addy;
https://register.homelite.com/contact_us/new and Fill Out the Required Information. Remember to have the UT Number if this Unit has One.
>>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 and for Chainsaws and Trimmers they Do Not Bog DOwn Under a Load. 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 I Missed Something or 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)
3helpful
1answer

Hard to start

Hello judy_keough2:

>>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 and for Chainsaws and Trimmers they Do Not Bog DOwn Under a Load. 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 I Missed Something or 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)
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