Rest Carburetor back to Factory Settings like this….

Turning the fuel adjustment screws all the way in (clockwise) until they barely seat and then turning them out (anticlockwise) by a certain amount, usually one full turn, are common procedures for resetting a tiny two-stroke chainsaw carburetor to its factory settings. These factory settings serve as a starting point for further modifications. Here is a thorough, step-by-step instruction:
Tools and Materials You'll Need:
Small screwdriver or carburetor adjustment tool
Safety glasses and gloves
Owner's manual (if available)
Procedure:
Safety precautions: Before you start, make sure the spark plug is disconnected, the chainsaw is off, and you're wearing the proper protective gear, such as gloves and safety glasses.
Finding the Adjuster Screws: Locate the carburetor's fuel adjustment screws. These are normally found on the side of the carburetor body and are referred to as the "L" (low-speed) and "H" (high-speed) screws. For safety, they could have plastic coverings or caps.
Find Factory Settings: It's important to be aware of the factory settings that the chainsaw's maker suggests. These settings can differ based on the brand and model of the chainsaw, so consult your owner's handbook or the manufacturer's documentation to find out what they should be.
Initial Adjustment - Clockwise Seating: Begin by lightly seating or bottoming out the "L" and "H" screws by clockwise (inward) rotating each of them. When doing this, use caution to prevent harm to the screws or carburetor. The "closed" position is the default setting.
After lightly seating the screws, give each one a complete anticlockwise (outward) turn before backing off. For further fine-tuning, this one-turn anticlockwise adjustment serves as a starting point.
Put on your safety gear and start the chainsaw after reconnecting the spark plug. So that it reaches its operational temperature, give it some time to warm up.
Low-Speed Adjustment (L Screw): Slowly and incrementally crank the "L" screw anticlockwise (outward) while the chainsaw is operating. As you listen to the engine, keep an eye on the chain to see how it moves. The objective is to locate the point where the engine operates without hesitating or stalling. The ideal low-speed setting is indicated by this.
After making the necessary low-speed adjustments, run the engine to full throttle and slowly spin the "H" screw anticlockwise (outward) in tiny increments. The goal is to achieve error-free, fast functioning without too much smoke.
Final Check: After making these modifications, run the chainsaw for a few minutes at full speed and idle to make sure it maintains stability and doesn't stall. To fine-tune the settings, make any little tweaks that are required.
Verify with Factory Settings: Compare your adjustments to the factory settings if you have access to them in your owner's handbook. If there is a sizable difference, modify further as necessary to comply with the manufacturer's instructions.
Lock the Adjuster Screws: Once you're happy with the settings, you can mark the screw positions with a little bit of thread-locking compound or paint to prevent unintended change.
Remember that these are only general instructions for returning a two-stroke chainsaw carburetor to its original default settings. Consult the owner's manual for your chainsaw for exact factory settings. To guarantee optimum performance and safety, consult a qualified chainsaw mechanic if you have questions about carburetor adjustments.
I hope you have gained something from this video.
Thank you
Craig Kirkman (Owner and Creator of The Repair Specialist Channel)
#ChainsawMaintenance
#CarburetorAdjustments
#EngineTuning
#ChainsawRepair
#SmallEngineMaintenance
#ChainsawSafety
#CarburetorSettings
#FactorySettings
#ChainsawPerformance
#TwoStrokeEngine
#CarburetorTuning
#DIYChainsaw
#SmallEngineRepair
#CarburetorCalibration
#ChainsawCare
#EngineOptimization
#ChainsawTips
#ChainsawExpert
#ChainsawWorkshop
#DIYMechanic

[@peglegjim57]

I’m a long time 2 stroke service tech, and I’ve had much better luck at just under 1-1/4 turns out from the seat position. And very importantly, ALWAYS adjust the High Speed before the Low speed. It will give you the smoothest transition from low to high speeds.

[@theobserver9131]

Amazing how long it took me to find this information! So many youtubers want to tell you their life story, and not the bits you're looking for. Thank you!

[@rickreid81]

Excellent video. That's the best way to start an adjustment from zero.

[@flycorvus]

oh, yeah YT is an open source high school for DIY enthusiasts thanks for sharing, bro'

[@rashardmcmillian2276]

This is my new go to channel for small engines! Thanks! Super helpful and easy to understand.

[@CervantesLeRoi]

Your channel is THE place I go to for any help. It's like the standard videos for anyone interested in small engine repair. They probably play your videos at colleges.

[@johnwade5747]

Always good to point out that you want to adjust the high speed, bigger flow adjustment first. Open the mixture screw until it slows down from flooding, then go the other direction past where you started until it slows down from starving. Then go back to the middle of the two, known as the sweet spot. Always adjust the low speed last, because it actually is a bleed off of the high speed and if you did them in reverse, doing the low speed first, when you got to the high-speed you would actually be changing the low speed as well. Hi speed is always the farthest away from the engine. If you run into an engine that you can’t adjust with a screwdriver, you can take a hacksaw and cut splits in the aluminum surround that is intended to keep you from adjusting them and at the same time let it cut the slot in the head of the adjuster. That oval surround is to keep in compliance with Californias air board.

[@deadtodriving]

Awesome video. I recently purchased a used stihl TS350 that I was told didn’t run and needed the carb to be replaced I came across this as I was about to pull off my carb and get a rebuild kit for it. One screw was out about 7 full turns and the other was out about 3.5 turns. I followed your advice and it fired up on the first pull and idled perfectly.

[@vapinbachelor289]

And he educated me again!!🫶🏼🫶🏼

[@Maddog2020RH]

Thank You very much! I did exactly what you said and my Husquavarna blower is working perfectly!

[@TheRepairSpecialist]

You're welcome!👍👍👍👍

[@Turbojonny5]

Straight to the POINT...Thank you

[@TheRepairSpecialist]

Thank you 👍

[@israellopez9147]

This is good for trying to “reset” a carb’s tune so you can get it to start and eventually tune it to run. Different carbs will have factory tunes set for the unit they’re attached to. That’s typically in the owners manual or a dealership workshop manual or something of the like. I work at an ECHO and Husqvarna dealership and we have carburetor adjustment manuals relative to the model and unit that tells us the factory settings for the carbs.

[@israellopez9147]

Obviously, if you don’t have the manual, this video shows you how you can work to get a random carb in tune.

[@TheRepairSpecialist]

Hi thank you for sharing your expertise and insights regarding carburetor tuning and factory settings. It's great to hear from someone with experience working at an ECHO and Husqvarna dealership, where you have access to detailed carburetor adjustment manuals specific to different models and units. These manuals are incredibly valuable for understanding the factory settings and recommended adjustments for optimal engine performance. As you mentioned, resetting a carburetor's tune can be a useful step in troubleshooting starting issues and fine-tuning the engine's operation. The factory settings provided in manuals serve as a reliable baseline for ensuring the carburetor is properly adjusted according to the manufacturer's specifications. For those looking to tune their carburetors, consulting the owner's manual or dealership workshop manual specific to their equipment is essential. This information helps ensure that adjustments are made correctly and in accordance with the engine's design and performance requirements. Thank you for sharing your knowledge and emphasizing the importance of using accurate factory settings when adjusting carburetors. Your insights contribute to a better understanding of carburetor maintenance and tuning for improved engine performance. If you have more tips or information to share, please feel free to do so. We appreciate your engagement and expertise within our community! Best regards, Craig

[@superflanker972]

This tips works on my stihl 038 & 381 too..👍👍

[@a_dog_with_sushi4250]

thanks you so much! i have a weedeater from my neighbors, and they said the engine was shot, turns it it just needed a tune !

[@yoanriera7154]

Excelente allí prende y allí vas girando poco a poco hasta carburar perfectamente 😊

[@paulnagy8551]

Thank you my British friend. Cheers!😊

[@TheRepairSpecialist]

Thank you too!

[@danielchrisronan2281]

How come there's no heart instead of just a thumbs up. This literally just saved me my weed wacker. I was about to throw it out. 🙏

[@saulsaldana2281]

Thank you so much I have been looking for this information. 👍♥️🇺🇸

[@ratumanoasuguta1038]

Thank you so much for your help.

[@TheRepairSpecialist]

You're welcome! Thank you 👍👍👍

[@UJLD]

How about the idle screw?

[@BenjaminCantu-d9x]

I just want you to know that this is the exact video instruction I needed. Thank you, sir 🙏

[@TheRepairSpecialist]

You are very welcome thank you

[@BrianHillary-ro2tr]

like this one. very clear advice

[@thomthorne7306]

Thank You. I'm still learning

[@bkrgls]

Thanks! I swear small engine carburetors get on my NERVES! For something so small and seems to be so simple...they can be a serious pain in a$$. Now I need to watcha video about the dang governor. 😮‍💨Working on my Holley 4 barrel was so much easier.

[@Antonio-gq6fx]

Thanks.I must look at my Honda next time I'm out mowing

[@albertsewell878]

Thank you for all the videos.i have learned a lot from them , i have one question about 2 stroke carbs that i have recently seen . What is the purpose or function of the hole on the diaphragm side with a hose going to the air box ? Not all have this .

[@mrtennessee6862]

Thank you for that tip.

[@magicvisualmedia4241]

Luv u dr I escaped from this situation with ur guidance

[@Davewutsup]

Great tip ✨

[@akmaldawson5187]

Good 👍 job

[@TheRepairSpecialist]

Thank you so much 👍👍

[@558vulcanxh]

Thanks Craig, that's decent gen 👍

[@dannystewart7106]

Grate mate ferry used idea

[@Syafira_record]

Saya baru saja memperbaikinya... Dan telah berhasil bisa digunakan kembali beraktivitas

[@TheRepairSpecialist]

Brilliant

[@thomasbyzewski2687]

Thank you

[@GlenB1963]

That is great advice 👍

[@TheRepairSpecialist]

Thank you so much for your kind feedback. Craig 👍👍👍

[@Mark-vd8oi]

THANKS FOR THE TIP HOPE IT WORKS

[@TheRepairSpecialist]

No problem. Thank you

[@kaboommushroomhead]

Very helpful. thank you, sir.

[@TheRepairSpecialist]

You are welcome

[@joeturcotte1935]

Great video.

[@gkrstini]

i thought it is 1.5 turns, or it depends on maker of carburattor, or i am wrong?

[@TheRepairSpecialist]

There is nothing set in stone with this. It largely depends on the engineers preference of how the prefer to set them and of each individual manufacturers spec. You’ve only been told one way of doing it

[@merrilleugenebowles6570]

I've always done it that way too... it works Everytime.. thanks for your opinion

[@sheilahsay]

Thank you very much.

[@TheRepairSpecialist]

You are welcome!

[@andrewurbanowski1666]

Mic mac you rule!!

[@Wackscave]

L is low H is high rev. Some chainsaw carbs is 1,5 turns. Depends on what chainsaw you got

[@justprc]

Works thank you 🤠

[@TheRepairSpecialist]

Awesome. Thank you 👍👍

[@justprc]

I have a 2 Stroke rc car and I messed up the carb screws and I spent hours working on it but it wouldn't start but looking at this video I set the screws and boom started right up

[@C-130-Hercules]

It's 1 & 1/4 turn each. 😊

[@AmrinderSingh-zx9hr]

Very good Explained 👍

[@TheRepairSpecialist]

Thank you for your kind feedback. Craig

[@buddyhaywood8469]

Good stuff

[@deanharrison7826]

Thanks

[@daisylopez5891]

Thank you.

[@TheRepairSpecialist]

You're welcome!

[@richardzubeck8704]

all these years i always able to start just about anything i never knew that

[@JaMaLKhan-rg4fx]

Uncle you're 💎💎💎💎

[@TheRepairSpecialist]

Thank you so much

[@JaMaLKhan-rg4fx]

@@TheRepairSpecialist welcome 🤗🤗

[@edmundocordero6031]

Lo hare y te cuento toma tu like joven

[@seekenergywithin4177]

Ms 250 saw installed a new carb. Question what about the idle screw how do you adjust that?

[@stormyswearengen9102]

This gal thanks you

[@TheRepairSpecialist]

Thank you 👍👍

[@todwyant6839]

Adjust as needed...just what he said

[@BerntDanielsson4535]

Which threads?

[@bhekumzijekwa803]

As the weedeater get older problems lead you to go fiddle with those H and L screws and sometimes you try in vain and nothing only to find out that the filfer inside the fuel tank is blocked or the diaphragm is faulty

[@obbiebeal3060]

10,000 TIMES thank !

[@kraftzion]

I'm at 2 turns out on the low speed and 2.75 turns out on the high speed. Maybe drilling my venturi out from 9.5 mm to 12mm had something to do with it?😅

[@silverdragontaylir8252]

I do two turns(then adjust H)

[@TheRepairSpecialist]

👍

[@WaynesAdventure]

Cool 👍

[@TheAcenightcreeper]

Umm my echo 2511t has 2 and 5/8ths for H and 1 and 7/8ths for low and 1 and 5/8ths for idle screw as the manual factory settings

[@TheRepairSpecialist]

Of course there are some differences between different brands but the way I have explained is a general way to bring a carb back to a general factory setting. Let’s say you no longer had the manual for reference then this would be the best and probably the only way to deal with it.

[@Goldenhand9]

Great❤

[@howardwayneroberts93]

If these aren't set correctly,will the carburator leak gas?

[@TheRepairSpecialist]

HI thank you for your question about two-stroke chainsaw carburetor adjustment and the possibility of gas leakage if the adjuster screws aren't set correctly. In two-stroke chainsaw carburetors, improper adjustment of the carburetor screws can indeed lead to various issues, including potential gas leakage. Here's how this can happen: Idle Speed Screw: If the idle speed screw is set too high, it can cause the engine to run excessively rich, leading to an overflow of fuel in the carburetor and potentially causing leakage. Idle Mixture Screw: Incorrect adjustment of the idle mixture screw can result in a mixture that is too rich (too much fuel) or too lean (too little fuel). A rich mixture can lead to fuel overflow and leakage from the carburetor. Float Valve or Needle Issues: If the float valve or needle is not functioning properly due to incorrect adjustment, wear, or damage, it can result in fuel not being properly regulated within the carburetor. This can lead to fuel overflow and leakage. To prevent gas leakage and ensure proper operation of your two-stroke chainsaw carburetor, it's important to: Refer to the manufacturer's specifications for the correct adjustment of idle speed and mixture screws. Use the appropriate tools, such as a tachometer and a screwdriver, to make precise adjustments to the carburetor screws. Regularly inspect the carburetor for signs of leakage, fuel overflow, or other issues and address any problems promptly. If you suspect gas leakage from the carburetor due to incorrect adjustment, I recommend consulting a qualified technician or referring to the specific carburetor adjustment guidelines for your chainsaw model. Thank you for your question and for engaging with our community. If you have further inquiries or need assistance, feel free to reach out! Best regards, Craig

[@Angry-Lynx]

Well each carb have own factory settings for our RC cars engines is usually around 1.5 turns out

[@N_Joji]

Thank u man, u saved my a,s

[@TheRepairSpecialist]

You are welcome!

[@johneppstv]

Ty cuz I just got lost on the 2 with 21t

[@TheRepairSpecialist]

Thank you

[@serhatzencirci7962]

than you frindly

[@dthundergunb3115]

Will this work on a chainsaw

[@abzar.baghbani]

Good

[@smackahoetribe1906]

IS There Anyway I can Send A Picture Mine has the Same Screws But there's Plastic on both and I can Only turn it so Much I don't even know what its called

[@TheRepairSpecialist]

I hope the link I sent you works out for you!

[@HarryManchester-x2v]

Hi I’ve got a petrol leaf blower. And I adjusted the low speed needle and high speed needle. There is only one screw which operate the same needle eg low speed and high speed. I can’t seem to get it to rev up properly what the course of this problem

[@hughiemaceachern5282]

And 2 strock in is richer out is lean

[@Someone91741]

Does this work for stihl trimmers?

[@TheRepairSpecialist]

Yes it should work fine depending on your model of Stihl Trimmer

[@redmanvola4230]

Ingco trimms have on screw

[@redmanvola4230]

Some carbo have one screw

[@theleafsprungjeeper]

I have a question. On my Pioneer 1200A, the throttle linkage is fine but the part on the carburetor won't move more than a millimeter. I disconnected the linkage going up to the carburetor and tried to move it with my fingers without success. I have never actually fired up this chainsaw. It was a gift and I just wanted to clean it up and that's when I noticed the issue. Any advice would be greatly appreciated. Thanks.

[@nagazinafireworks7594]

My chainsaw still bogs down not sure on how to put the screws exactly

[@TheRepairSpecialist]

Hi This video of mine should help: kzbin.info/www/bejne/bWXTanmCoq6eodk Thanks Craig

[@frankmolina3951]

Im a professional poor kid that grew up and could fix anything. I agree

[@TheRepairSpecialist]

👍

[@zm4710]

My favorite carbs

[@TheRepairSpecialist]

👍

[@mikeschoolcraft21]

First count how many turns in.

[@TheRepairSpecialist]

Thanks

[@strestuardostr4959]

Y si no prende maistro ?

[@hueman8607]

But i need throtle setting

[@d.s2432]

هل هذا الوزن يصلح لمنشار ياباني

[@terencescott3957]

Why couldn't they make all adjuster screws where you need a flat head screw driver???????????? I had to go buy a pacman wrench. Up until two weeks ago, I had no idea what a pacman wrench was. Good thing it was only $7.

[@anthonynagle]

Thank you

[@TheRepairSpecialist]

You're welcome

[@joemcintyre2090]

I have been doing 1 and a quarter to 1 and a half. I've tried the 1 full turn and the machines don't want to start. Maybe at sea level 1 turn would do.

[@ronaldnorris2179]

Same here 👍

[@Leigh-dj2cr]

I was told 1.5 turns

[@tjcambre5236]

Thank you so much it worked fist try

[@TheRepairSpecialist]

You're welcome! Thank you for your feedback. Craig 👍

[@MrOscaravendano24]

I have an issue right now with my idle it seems to fluctuate and speed up, but when I push on the throttle it’ll correct itself. Than do the same thing after a few seconds. Any suggestions?

[@Swampkiller1Tv]

Wht if it doesn’t start still

[@condoglaronde1920]

Most saws are happy at 1.1/4

[@MT_T991]

Husky 395 for some unknown reason use 3 turns out.

[@TheRepairSpecialist]

Wow. Thanks for letting us know! Craig

[@teafuse583]

Wait, i thought the L was 1 and H 1 and a half?

[@TheRepairSpecialist]

Yes I agree with you, its just that some people recommend one turn, others on and a half, and then go from there, that's all.

[@KemarrichardsGarth-lz3eb]

Does it work an a 29 still

[@TheRepairSpecialist]

Unfortunately this probably will not work for your 029 Stihl because as far as i can remember, these chainsaws don't actually have H and L screws. Don't quote me on this but I believe that, Instead, they have a compensator built into their design that alters Air/Fuel ratios automatically as they operate. If you are having running problems due to the carb, then it might be a good idea to have the serviced and possibly diaphragms replaced. That might sort it. Best regards, Craig

[@russclifton2026]

I have a Honda UMK-422, after changing carby still runs at max for 1-2 min then dies or stops, sounds starved of fuel, i checked the fuel cap breathes normally.. ? Would appreciate advice..

[@hueman8607]

Check intank fuel filter/location

[@samuelcasanova4579]

What about the bottom screw and your video is great ty.

[@TheRepairSpecialist]

The bottom screw is the idling screw. It sets the idling RPM. Thanks. Craig 👍

[@easytomove]

That's eco mode

[@amikadir5626]

L 1 1/2 H 1

[@davesmith9325]

There is no one standard. Different engines and carbs are .. different.

[@TheRepairSpecialist]

Very true, but in general you can get away with setting most of them this way. Thanks Craig

[@Ruel_SimpleLifestyle]

​@@TheRepairSpecialistFor my ms250 chainsaw to save fuel, H how many turns and L how many turns?

[@CalvinsCorner72]

Not working