Single Tuning Screw Adjustment Weed Eater & Strimmer Carburetor (Adjusting only 1 of the 2 screws)

There is two fuel-to-air adjuster screws on this type of Carburetor, but this video shows you how to get results with adjusting just the largest and most accessible of the two.
In this video I'm going to show you how to adjust the type of 2 Stroke Carburetor with a single adjuster Screw. This style of carburettor fits Weed Eaters / Weed Wacker / Line Trimmers/ Strimmer / Brushcutter, but also Hedge Trimmers and some Chainsaws. But aside from what the carburettor fits, we have the single adjuster screw. I have been asked many times how to adjust this type of carb.
Ok, so, the adjustments on these are actually very simple indeed. Much more simple that the type of carburetor with the a 'H' and 'L' screw setting such as what we see on some other chainsaws etc.
First of all then, we will look at how to adjust the High RPM. The following is an explanation of how I do this procedure, and I am NOT saying it the the best or quickest way.
With all safety precautions met, I start the engine. I Revv the engine to MAX RPM. I take an appropriate screw driver to the single adjuster screw at the center of the carb (Not the single screw situated at the top of the Carb. This one is adjusted later!). I then start to slowly turn the screw Anti- clockwise until I can hear the engine start to change it's tone to a Rich/Lumpy sound, and the engine RPM starts to reduce slightly (If I was to keep turning in this direction, the engine RPM would continue to lower and the engine would probably stop due to too much fuel flooding the engine). When I then turn the screw back in the opposite direction (Clockwise) slowly, so I can hear the engine RPM start to increase and become smoother.
If I was to keep turning the screw in this direction then the engine RPM would increase for a very short time before reducing and becoming weaker whilst continuing the turn. This would be due to the engine not receiving enough fuel. So I bring the screw back to a nice medium point somewhere between the two extremes, but, just on the edge of being very very slightly Rich of fuel. This is to make sure that there is a good supply of 2 stroke fuel going into the engine with it's accompanying lubricating 2 stroke oil, but not too much that the engine efficiency suffers for it.
Well, that is the High RPM sorted, now for the Idling Speed. The Idling adjustment screw is the small single adjuster screw situated at the top side of the carburettor, above the High speed adjuster screw that we have just set. So from idling, I screw in the screw (Clockwise) if I need higher idling RPM and outward (Anti clockwise) if I need less idling speed. I usually reduce idling speed enough so that the strimmer head (if on a weed eater) stops turning but maintaining a good RPM, and increase the speed (screw clockwise) if I feel the engine is running very low, of course. It's really that simple!
The Two Stroke Carburetor can seem complicated initially, but with some explaining this can be de mystified.
I hope you find this video useful, and I really hope you enjoy it.
Many thanks indeed
Craig Kirkman (Owner and Creator of The Repair Specialist Channel)
#CarburetorAdjustment
#2StrokeCarb
#WeedEater
#ChainsawCarburetor
#StrimmerMaintenance
#EngineAdjustment
#CarburetorScrews
#HighRPMAdjustment
#IdlingSpeed
#DIYMechanic
#EngineTuning
#SmallEngineMaintenance
#ChainsawTips
#WeedWhacker
#EnginePerformance
#CarburetorExplained
#2StrokeEngine
#CarburetorScrew
#CarburetorTutorial
#DIYEngineCare

[@juicyfruit-kq1bo]

You have just saved my strimmer from the scrapper! The engine kept cutting out and I tried everything new plug, new fuel filter but no luck but I found your video and I turned the screw just a fraction to the right and now it's running fine I can finally cut the grass, Thanks very much!

[@TheRepairSpecialist]

Thank you for your kind and motivating feedback. I really appreciate it. Craig 👍👍👍👍

[@noahhamilton9028]

Was just about to go to work on my weed wackers carb, very clear and digestible explanations that will be very appreciated by me in the next 35 minutes as I rebuild this carburetor. I’m sure it will be appreciated by others as well. Thanks man! Keep up the good videos!

[@The-Mandolorian]

Really clear and informative video. Thank you.

[@TheRepairSpecialist]

Thank you so much 👍👍👍

[@bigdan7281]

Thank you for this! Just the right amount of detail and brevity.

[@misopo111]

Thank you for your tips, helped me a lot with setting up the new trimmer

[@leeBoB4257]

Best video channel on KZbin. Thanks very much.

[@user-vs9iw7ic5u]

Thank you friend. It was the first time I found someone talking about this carburetor. Thank you very much. I'm talking about Penha Beach SC - Brazil

[@TheRepairSpecialist]

Awesome. Thank you for your kind feedback. It sounds like an amazing place you live 👍👍👍

[@motionhits]

Thanks for the explanation, animation exsaples make it much easier to understand... Keep going

[@bimalnandana9679]

Very helpful to understand your creative video with well explanation .Thank you very much .

[@AndysDogHouse]

Hey Specialist. Good video. I always learn something when I watch your videos. Thanks for sharing.🍁🍁👍

[@PatGreen1830]

I learn best from your pictures. The pictures help me understand what each piece does.

[@user-hg7lz3el7b]

Hello.Thanks.I was looking for a video of this type of carburetor tuning for a long time and found it today.Thanks again.

[@TheRepairSpecialist]

My pleasure! Thank you. Craig

[@JOEZEP54]

Been doing this for awhile but always enjoy your videos. Nice work. I believed I mentioned this before, wish I had something like your channel years ago. Would have saved so many hours. But a lot of newbies still have to learn & some of us older guys getting a refresher. Stay well, Joe Z

[@andrewcostello8626]

Great video,really explained clearly,just set my echo strimmer up,running great now.thank you 👍

[@TheRepairSpecialist]

Awesome. Thank you for letting me know and for your kind feedback. Craig 👍👍👍

[@johnsomerset1510]

A great video. Thanks a lot. Incidentally, my hedge trimmer had the adjusting screw in a recess and with a pacman head (slot on one edge). So I jammed a nylon rawl plug onto its 5mm dia head and unscrewed it fully and then cut a slot in the top for a normal screw driver to fit, as I don't have a pacman screw driver.

[@BikingVikingMTB]

Banging just what I needed to watch cheers 👍👍

[@Kotagali]

Great video. Thank very much, I've learnt a lot with it!

[@donquixote9813]

Great video. my T272x run great now

[@nwsights6301]

Single screw? What about the tiny hidden screw at the top of the carburetor? It's usually hidden under a little rubber piece inside the gold circle piece on the throttle cable hookup.

[@martinlang9615]

He is calling it a “single screw”, because most are a double screw (high and low). Yes there is the idle screw, and I have another (on the single screw carby) but this one has about 4 settings and is on the metal cam the throttle cable attaches to. Not quite sure what this does.

[@TheRepairSpecialist]

Hi guys I just wanted to Introduce to you my other Channel "Kirkman's Academy" - which i'm just getting started. It's a go-to channel for simple explanations for hard to grasp subjects such as physics, maths and chemistry etc. Here is the link: www.youtube.com/@kirkmansacademy/videos . Thank you so much for looking, and if these topics interest you then I hope to see you the there. Many thanks indeed. Craig 😊👍

[@rishimakhanlal8905]

Very well explained!

[@user-rf2qt8ou8w]

Just found this after repairing a friends trimmer(bmc g wizz make) which had been stood for a while.Evenrually found the fuel pipe in tank had split so would not prime up unless it was tilted.Just fitted new and ran up engine but struggled to rev ,tweaked thus screw and improved it but this video will be a big help to re adjust settings as i have no owners manual,,thank you .

[@TheRepairSpecialist]

Thank you and good luck with your set up. Craog

[@chrisjones-dr2db]

Love your video simple and easy to follow and understand from Sydney Australia cool keep going thanks

[@TheRepairSpecialist]

Awesome, thank you! Craig 👍👍👍

[@gregoryross.303]

Thank you for sharing your knowledge. Now I know how to adjust my trimmer carb mixture screw.

[@TheRepairSpecialist]

Thank you so much 👍👍👍

[@danielbaldi320]

Simply brilliant!

[@gunterbecker8528]

I'm impressed with you

[@TomDobyMowerRepair]

always love your videos!

[@jstil444]

Very well explained, thank you!

[@TheRepairSpecialist]

Thank you so much 👍👍👍

[@tommystanding8091]

Earned yourself a subscription sir. Good stuff

[@TheRepairSpecialist]

Thank you so much. I really a appreciate it. Craig

[@TheRepairSpecialist]

All Episodes -for 2-Stroke Carburetors Here. Thanks. Craig: kzbin.info/aero/PLrlXp3PlwgRI5OLvm3P91LJr1CYnO5TRD

[@agtakaitilak645]

Thanks for the information very helpful.

[@TheRepairSpecialist]

You're welcome! Thank you

[@mammothmotouk]

Cracking video. Very happy with that. After a day tinkering with my strimmer getting it to run right. Your video did it in minutes. Subscribed!

[@TheRepairSpecialist]

Awesome. Thank you 👍👍

[@TheRepairSpecialist]

Hi guys. What I should have mentioned is that these carburetors, on these strimmers have two adjuster screws. The one shown, as well as a tiny screw at the very top of the carb. I didn't include the adjustment of the latter screw because i was trying to keep my explanation simplistic. The adjustments I made in this vid are a more common, quick adjustment, but if this does not correct your adjustment issues, then the other screw at the top will need to be adjusted. I will make a video on how to do this. Thanks and sorry I didn't include it in this video. Craig

[@contraband1543]

Great video and visual explanations. Glad I found your channel. What should I do if the engine never bogs down when I turn the fuel mix screw all the way out until right before it completely unthreads? If you could include that in your new video I would appreciate it very much.

[@fa046192]

Thank you , very helpfull movie.

[@Kooq5]

Very informative, thanks!

[@TheRepairSpecialist]

You're welcome! 👍

[@dianemousso4858]

Well explained. Thank you.

[@TheRepairSpecialist]

You're welcome! 👍👍👍

[@gregio6295]

Hi there love your videos there so informative thanks so much I really appreciate them. I have a question I got a shindaiwa trimmer with that same type of carburetor I think its a walbro wyk series, anyway I changed it and it ran perfect but the next time I went to use it I won't start. Could you give me some tips I should check on, I changed all the fuel lines and grommet and like I said its a new carb and gasket.

[@bobs12andahalf2]

Looks like the exact same carb as on a Chinese trimmer I picked up for dirt cheap second hand, and maybe even the exact same trimmer. Except they're sold here under a brand that pretends to be German 😅 anyway, it's a good enough trimmer. It was sold as broken, I dismantled the carb and the only thing that seemed to be wrong was that the metering valve was sticking. Gave it a few wiggles, put it back together, started on the second pull and runs like a charm.

[@henkiejong1136]

I wish you did sell parts for those small carburetors , which are not easy to get here in New Zealand.

[@mrodriguez5259]

Magnific

[@davidruiz5383]

Thanks for the video, question Echo SRM 230 will start only if sprayed with carb. cleaner..what may something for me to check. Again, thanks and God Bless

[@iboss2569]

Great video. Can you do a video on how to clean the engine without damaging the engine, thanks.

[@teodomietumakay1973]

you're the best 😊,...

[@TheRepairSpecialist]

Thank you so much 😀

[@thelusienorchestra]

Grazie mille Ora ho capito tutto...se domani senti un botto sono io :) 😀

[@TheRepairSpecialist]

Thanks

[@CharlieTaylor-lv8gy]

Thanks for this Craig however…….. I’ve had a couple of replacement carbs for strimmers (with single fuel adjustment screw), however, it won’t start so I can’t begin to follow your video instructions (will run with fuel under the plug) Please advise on how to adjust screws to start it even……….

[@vedatsozen]

Spinning part of my grass cutter was spinning without steering. Repairer changed the pressure plate and its container. After i use cutter it again started spinning by itself. Repairer said may be i need to adjust speed by you told in video ? Spinning front cutter side can be adjusted by this way ?

[@sekhon6o4]

I’ve got the exact same carb on my 2-stroke pocket bike, however I can’t seem to get it started it constantly floods or is too lean I don’t really know. I think I might’ve messed up the idle speed screw along with the air/fuel mixture screw. Any ideas on how I can get my bike to start again?

[@martinleska4292]

Chainsaw carbs has two visible screws on side marked as HI and LO. This trimmer style carb has one on side like on video and second screw is on top of throttle flap inside needle covered by little black plug. Adjusting of this screw Its not very important if you have original carb where it was set by manufacturer. There is large margin between stall low speed and clutch engage speed and you can compensate little wrong adjustment of low speed screw by increasing or decreasing idle speed. But if you rebuild carb with new membranes or change whole carb with non OEM part you need adjust LO-speed screw too because it has huge impact on acceleration performance. If its too much offset engine can chokeing or full stall after aggressive full throttle applied or stall after throttle is released quickly even if engine running good on idle by itself. This two screw setting affecting each other little bit, you need to adjust first, then second and return to first and second again. Its better adjusting carb in neutral weather condition. Not in garage in rainy day when it is too humid, not on hot sunny day when temperature attacking 35°C because with this setting engine can run rough two weeks later when temperature drops to 20°C.

[@TheRepairSpecialist]

I totally agree with you that there is indeed a screw at the top of these types of carburetor. What I should have done though, is mentioned this in the video. I was trying to show a more basic and common adjustment to the carb without going into too much detail and keep things simplistic for the viewer. Thank you for your detailed explanation.

[@idkwho999]

I just bought new grass cutter with this carburator and ir only runs on choke, without choke it idles good too, but when i press the throttle without choke it bugs down fully.

[@FerNando-ys5hc]

Hello,TRS I just wanted to make a video about how to fix stuck piston for 2-stroke engine pls?

[@williamalbiso2681]

Can you make tutorial video how to tune up carburetor Ey 15 for Robin engine. Thank you

[@kraftzion]

I have a question for you. I have a carb just like that other than it has the low jet adjustment down through the center of the rotating shaft. I have a tanaka trimmer that has almost the identical carb with the exception that it doesn't have the primer bulb on the bottom and doesn't have the high speed jet adjustment. The primer bulb is part of the air filter housing. It runs rich at wide open throttle. Can I take the primer bulb off this carb, install a plain cover and use the primer bulb that is part of the air filter housing. This would give me a high speed jet adjustment.

[@phongnguyenthanh7215]

Cảm ơn thầy

[@mad2strokeguy694]

I have replaced this type of carburetor with a chainsaw carburetor on my brushcutter

[@ramsunthar7459]

Just seeking your advice as to how to remove the carburetor cover? I don't know how to remove air filter cover

[@howardwayneroberts93]

My 40-5 Honda weedeater,only will run at half choke..can you give me some advice,thank you sir.,it is a two stroke,single carb adjustment.

[@wadebarnes6720]

Can you put a bigger head and piston on weedeater motor to get more power out

[@user-sp4gv3ze6z]

Hi i have a Trueshopping long reach saw. i have not been able to use this item due to health problems i have cleaned the carb change the fuel but cant start it, do the elec cables from the starting switch have anything to do with this, just tried everything i can think of would be glad of any advice you can give please

[@BikingVikingMTB]

Ok so the fuel pipe on the left as you look at the machine came off and made a hissing sound now the bleeding thing won’t start.! Any ideas as to why? I’ve done the basic checks ie fuel, fuel filter there’s a spark on the spark plug!

[@jasonputtock4428]

Hey budddy. You have the same strimmer as me. Got an issue. Please can you demonstrate the Spark ignitor defective and working. I have a multi meter at hand. Does not matter if the switch is on or OFF. I have continuity in both positions On and Off. This is definately not correct. Please can you demonstrate..... Thank you.

[@mgomez5606]

What about the ones that do not have adjustment screws?

[@tedmiller1745]

I see no adjustment H Or L screws on my Shindaiwa 22T using a WYL Walbro Carb. Only Idle adjustment. Any ideas?

[@martinsurina6620]

Hy, sir. Could you please tell me what RPM is most optimal for this kind of weed eater? Thank you.

[@manuelfungke9457]

Hi. I have changed the piston rings because one of them broke. After changing it I am having trouble to get it started. Need help please?

[@KolbyYT]

hey can you help me i just replaced my carb and its going on max speed while on idle

[@user-fy4bu8dx1y]

Hi morning sir I am having a problem with my weeder when I start it to weed n try to Reve the engine it stick n continue to reve

[@hdkdante]

This is the exact carb my gas scooter is using. I played with it enough to understand this video but they problem im having is that the scooter keeps going forward on its own.

[@FerNando-ys5hc]

Great explanation but I have a question what's the use of the third screw on the top?

[@TheRepairSpecialist]

Thank you for your kind feedback. Im currently in the middle of making a video on all about the small top screw. It should be ready for upload in a week or two hopefully, so please stay tuned to the channel go see it 👍

[@abzar.baghbani]

👏👍

[@JennieMartin-nk7ms]

Hello, mom just got a new (YQM5200) 2 in 1 Petrol Grass Trimmer 52cc 2stroke almost same as one in episode 20 backpack kind. Instructions suck can't see most pictures, and I have to install throttle wire and can't find how to do it. Episode 20 shows how to adjust not install.... Help

[@user-vs9iw7ic5u]

Is this single-adjustment carburetor better than the double-adjustment one?

[@TheRepairSpecialist]

Hi. No I wouldn’t say these carb are better than the carbs with two accessible screws. In fact, this particular carb does have two screws, but the other screw (low screw) is not very accessible.

[@GuysPlayingWithTools]

I am not a big fab of cylinder style carbs,. They are reliable but I don't feel like I can tune it the way I can with the good old H\L screws

[@TheRepairSpecialist]

Yes. Heard this said before and even though its much more simple, there isn't quite the same quality of tuning. Thanks. Craig

[@GuysPlayingWithTools]

@@TheRepairSpecialist I didn't day it and should have, good video. 🙂

[@michaeldominy2084]

Hello Craig, I have just got my McCulloch 210 strimmer working but, the speed is a bit higher than it should be, it does reduce for about a minute, but any idea why not an instant reduction.?🤔😊

[@TheRepairSpecialist]

Hello, I'm delighted to hear that you've managed to get your McCulloch 210 strimmer up and running! It's always a great feeling when equipment starts working again. I understand your concern about the idling speed taking a bit of time to reduce. Let me offer some insights: Warm-Up Period: It's quite common for two-stroke engines, like the one in your strimmer, to have a brief warm-up period during which the engine runs at a higher RPM. This initial high-speed phase helps the engine reach its optimal operating temperature, ensuring smoother operation. This warm-up period typically lasts for about a minute or so, as you mentioned. Idle Adjustment: You may have an idle adjustment screw on the carburetor of your strimmer. If you'd like to achieve a quicker reduction in speed after startup, you can try adjusting this screw slightly. However, please exercise caution when making adjustments and refer to your strimmer's manual for specific guidance. Routine Maintenance: Regular maintenance, such as cleaning the air filter and ensuring the fuel lines are in good condition, can also contribute to smoother idling and overall engine performance. Fuel Mixture: Verify that you are using the correct fuel mixture as recommended by the manufacturer. An incorrect fuel mixture can affect idling speed and engine performance. Professional Inspection: If you've tried the above suggestions and the issue persists or worsens, it might be advisable to seek the expertise of a local small engine repair specialist. They can inspect the carburetor and other components to ensure everything is in proper working order. Remember, your safety is of utmost importance when dealing with machinery, so exercise caution throughout the process. I hope these insights help you achieve the desired idling speed for your strimmer, and that you can enjoy its efficient performance for all your trimming needs. Happy gardening! I hope this helps a little but please understand that I have had to be quite broad with my answers because its not always easy to diagnose something unless I am with the saw. See if you have any luck and feel free to mesage me again if you nee to. Thanks Craig

[@michaeldominy2084]

@@TheRepairSpecialist Thank you very much Craig for that very informative info’, to get it running I had to strip fuel tank out, replace filter and fuel lines , new filter , and strip the carb down and replace the filter, needle etc, which enabled me I hope to get it running at least. I have never experienced the speed like it is happening but I am going to do as you suggested and see what happens. Again, many thanks, and hope I can call on you in the future,. 🤔😊👍

[@michaeldominy2084]

Can different carbs be fitted on a machine, or is there something to look for to be sure.?

[@TheRepairSpecialist]

Hi. Thank you for your inquisitive question, and I will try to answer it based on my knowledge, but the answer is both yes and no in my opinion. I've laid down my reasons below: Carburetors are indeed specific to particular engine types and applications (In most cases), and there are several factors to consider to ensure a proper fit. Here's what you should look for when determining whether a carburetor can be fitted on a machine: Engine Compatibility: Carburetors are designed to match the specific requirements of an engine, including factors like engine size, fuel type (gasoline or diesel), and the engine's air and fuel mixture needs. It's crucial to choose a carburetor that is compatible with your engine's specifications. Throttle Type: Different engines use different types of throttles, such as single-barrel, two-barrel, or four-barrel carburetors. Make sure the carburetor you are considering matches the throttle type of your engine. Airflow Capacity: Carburetors come in various sizes, which determine the amount of air and fuel they can mix. The size of the carburetor should be appropriate for the engine's power requirements. An oversized or undersized carburetor can negatively impact engine performance. Mounting Compatibility: Check the mounting pattern and arrangement of the carburetor to ensure it can be securely attached to your engine's intake manifold. Adapters or modifications may be needed if the mounting doesn't match. Fuel Type: Verify that the carburetor is designed for the type of fuel your engine uses. Some carburetors are specifically made for gasoline, while others may be suitable for alternative fuels like ethanol or propane. Jetting and Tuning: Carburetors often require tuning to optimize the air-fuel mixture for a particular engine. Understanding the jetting and tuning requirements of the carburetor is essential to achieve optimal performance. Manufacturer Recommendations: Consult the manufacturer's guidelines and specifications for both the engine and the carburetor. They often provide recommendations for compatible carburetors based on the engine's requirements. All that said, some carburetors can be changed (re-jetted etc, to fit different engines that are similar in size, and require air/fuel ratios similar to the Carbs original application, just 'tweaked' a little basically. In summary, carburetors are not one-size-fits-all components. To ensure compatibility and optimal performance, it's essential to carefully match the carburetor to the specific engine type and requirements. If you have a particular engine or carburetor in mind, it's a good idea to consult with the manufacturer or a knowledgeable mechanic for guidance on the best fit for your application. I hope this helps a little Thanks Craig

[@glennmckinley3058]

Isn’t there one more adjustment screw underneath the black plug on the top of the carburetor? Usually there is.

[@tedballou]

It's defiantly there is on mine, Idle mixture I think or they may be reversed.

[@SuperMARKNORMAN]

On the top of the throttle on mine is a tiny brass screw, any idea what that is! Thanks

[@jeeprenegade1985]

Low speed (acceleration screw)

[@williamfurniss6442]

So what does the adjuster do that's under the plastic bung on the throttle body ?

[@ciprianwinerElectronicManiac]

That little screw is the low speed adjustment. It's responsible for keeping the correct air/fuel mixture ratio for low to medium speed or thereabouts. It also adjust the throttle response speed.

[@williamfurniss6442]

​@@ciprianwinerElectronicManiacyes indeed just surprised this guy who obviously knows his stuff never even mentioned it

[@josephfollante7200]

I do that already adjusting air fuel mixture, but a few minutes the problem returned ,, what is solution, can i replace like a paper gasket manipold carburetor gasket?

[@TheRepairSpecialist]

Well if you have set the carburetor correctly then it could be a whole host of issues. Main crank seals leaking, Carburetor in need of cleaning and service, fuel tank cap kit venting incorrectly, inlet manifold gaskets leaking, to mention a few. It might be best to take it to a mechanic if you are still having issues. I hope you get it fixed ok soon though. Craig

[@kevinmckee9324]

Hi. Big question with hopefully some help, as it’s driving me made. I have a strimmer that uses the same carburettor. I have 3 of these carbs. 1 works fine, starts when cold etc. 2 + 3 won’t start when cold. However, when the strummer is warm, they work fine. I have stripped/cleaned and replaced gaskets etc, but still no difference. What am I doing wrong? Thanks for any possible help.

[@TheRepairSpecialist]

Hello there! First off, it sounds like you've been really thorough with your maintenance, which is great! Small two-stroke carburetors can be finicky, and the issue of cold starts can indeed be maddening. Since one of your carburetors is working fine, you're clearly doing a lot right. Considering that Carburetors 2 and 3 work well when the strimmer is warm, it suggests that your cold start issue may not be related to the fuel mixture or the gaskets. Here are a few things you might want to check: Choke Functionality: Make sure the choke is functioning properly. The choke helps enrich the fuel mixture when starting cold by reducing the amount of air. If it's not engaging or disengaging correctly, it can cause starting issues. Primer Bulb: Since you mentioned they're purge primer type carbs, the primer bulb should be firm to the touch after a few presses when cold. If it's not, it could be a sign of an air leak or a problem with the primer itself. Fuel Quality: Double-check the fuel mixture. Stale fuel or an incorrect mix of oil and gasoline can cause starting problems, especially in cold conditions. Spark Plug: Inspect the spark plug. A dirty or worn-out spark plug may not provide a strong enough spark for a cold start but can perform adequately once the engine is warm. Air Filter: Even though you've replaced gaskets, ensure that the air filter is clean. A clogged air filter can restrict the airflow, making cold starts difficult. Carburetor Adjustment Screws: Your carburetor actually have two adjuster screws on these. The common large screw on the side that adjusts for High RPM and there is another, hidden screw at the very top of the carb. This is for the LOW RPM. This usually doesn't need adjusting but in your case it might. Take a look at the top where the throttler turns. In the center there is a screw (you might need to remove some tiny plastic bung to get to the screw). Adjust this at LOW RPM if you feel there is any idling issues. Carburetor Internal Passages: While you've cleaned the carbs, there may still be some small passages that are clogged. Sometimes, ultrasonic cleaning by a professional can resolve issues that standard cleaning can't. It can be a process of trial and error, but don't lose hope! It's always the little details that make the difference with small engines. If you've checked all the above and still can't find the culprit, it might be worth taking them to a professional who can give them a once-over. Sometimes a fresh pair of eyes can spot something you've missed. Keep at it, and I'm confident you'll get those stubborn carbs to cooperate. Good luck! In the meantime please let know know how you get on with it! Thank you Craig

[@kevinmckee9324]

@@TheRepairSpecialist Thank you for the quick reply. I checked 2&3 again. 2 has a split pink non return valve, which must let air in somewhere and not hold the fuel. The fuel itself is new (or constantly replaced ) as it is used a lot. The plug could do with a change, but as it starts with No1, I thought that it would be ok. I have ordered some more parts etc. With new carbs being as little as £11, it’s not a massive issue….but, I hate not knowing why, and it’s worse when they work with a warm engine!! . Also I would rather fix than throw away. Thanks again. The battle continues!! 🤣

[@gazbullen]

Hi i have the same carb on a g scooter but it also has an adjustment screw in the top where the throttle cable goes what does that do?

[@jeeprenegade1985]

Low speed (acceleration screw)

[@williamfair]

👍🏾

[@KensSmallEngineRepair]

I've never seen a large screw on a barrel-type carb here in the US, wonder if it is a UK only thing? Great Video Craig, Knowledge is Power!!

[@GuysPlayingWithTools]

Most have it, it's under a plug

[@KensSmallEngineRepair]

@@GuysPlayingWithTools I meant the large screw, which isn’t under a plug.

[@TheRepairSpecialist]

Thanks for your kind feedback again Ken. I didn't realise there was a difference between the US and UK regarding these carbs. Thanks for letting me know. Craig 👍

[@GuysPlayingWithTools]

@@KensSmallEngineRepair I see them both ways all the time.

[@TomDobyMowerRepair]

i've never seen that style adjustment screw here in the US either

[@danfirtat6436]

One question if you're so nice... I have a Procraft Gd 62 49cc engine and I can't idle it (throttle to minimum) because the engine dies. No matter how much I adjust the carburetor or the idle screw (the one connected to the throttle cable), the engine dies when I turn the throttle to minimum. It works (I hit about 50-60 holes with it) but I have to keep the shock half way and it's not ok because it gets hot. I have it for a few weeks and it has been like this for nine ... What could be the causes? Impulse hole partially plugged? Any other adjustment from another screw that I don't know about? Should I purchase another carburetor? Thank you very much!

[@williamfurniss6442]

There is a screw to set the idle that this fella didnt mention , it's at the top of the throttle body in the brass ring but it has a rubber bung in it , remove the bung and the screw is under it , it's a very fine flat screw head and adusts the idle mixture

[@danfirtat6436]

@@williamfurniss6442 thank you very much!

[@1naequan]

@@williamfurniss6442should it be screwed in all the way small brass on top?

[@williamfurniss6442]

@@1naequan no I dont think so adjust the screw till you hit the sweet spot for tick over and low revs

[@EriaBanda-fg3eu]

how do i use new brash cutter for the first time

[@TheRepairSpecialist]

Hi. Please read your new brush cutters owners instruction manual. There you will find the best information specific to what make and model of brush cutter it is. Thanks

[@savannahtropix615]

I JUST BOUGHT A WILD BADGER & IT DIES AS SOON SS I HIT THE GAS THROTTLE --BUT I CANT FIND THE ADJUSTMENT SCREWS ON IT !? HELP ANYONE??

[@craftbrewer5401]

I am working on an Echo GT-2010 trimmer with a Walbro single adjustment screw carburettor. It idles nice but runs to rich at full throttle. When I adjust it to run perfect a full throttle, it will not idle. I took the carburettor apart, cleaned it and replace diaphragms etc. but nothing changed. It has 190 psi compression. Any ideas ?

[@TheRepairSpecialist]

Ok, it's good to hear you have cleaned the carb. Have you set the idling with the separate idling screw? I would get it to idle by adjusting the idling screw first, then rev up and set it with the single adjuster screw for high rpm. then see if it works better. Thanks Craig

[@craftbrewer5401]

@@TheRepairSpecialist its a single screw carburettor, so no high/low screw.

[@TheRepairSpecialist]

The single Screw is for both the High and Low fuel to air mixture adjustment, but there still should be a separate screw for the idling speed. Usually above the single screw adjuster, at the very top of the carb where the throttle cable meets the carb

[@johnlight460]

factory carb settings? mine wont Rev with out the choke applied

[@TheRepairSpecialist]

Sorry to hear you have been having problems. A small 2-stroke weed eater that only operates on the choke setting is frequently the result of a lean fuel mixture or a restricted fuel supply. By limiting the amount of air that reaches the engine, the choke setting can temporarily make up for a lean mixture by enabling a larger concentration of fuel to enter the combustion chamber. Here is a more thorough explanation of the causes of this problem: Fuel Flow Blockage: Inspect for any obstacles or blockages in the fuel tank, its lines or blocked fuel filter. A restricted fuel flow may lead to a lean fuel mixture. The fuel tank cap also has a special valve allowing air into the tank as fuel leaves, make sure this is venting well. To test this I run the engine with the tank slightly cap loose for a few minutes and see if the the engine runs better. If so, the tank is not venting correctly. Of course be sure not to allow fuel to spill out causing any dangers. To find out if the fuel filter is at fault, remove it and run the engine for a few minutes (providing there is not too much dirt in the tank) and see if it runs better. Then you will know if it is the fuel filter. I would then do the same with the air filter. Just for a very short while to see. Next, Dirty Carburetor: The engine may not be receiving enough fuel due to clogged jets, passageways, or a filthy needle valve in the carburetor. It might be necessary to clean or overhaul the carburetor. Lean mixtures can occur in engines due to air leaks in the intake system (inlet boot/manifold) which can be caused by cracked crankshaft seals, defective gaskets or the boot itself. Look for any obvious leaks, or while the engine is running, check for air leaks using a carburetor cleaner. Insufficient Fuel Delivery: It's possible that the carburetor's diaphragm or fuel pump aren't providing enough gasoline. Check for damage and make sure these parts are operating properly. Inaccurate Fuel Mixture: Verify that the fuel tank's oil-to-gasoline ratio is precisely as directed by the manufacturer. A lean state may result from an improper combination. Broken or Stuck Primer Bulb: Make sure it's operating properly. A broken primer bulb can prevent fuel from getting to the engine. As it is common, I will emphasize again here about a Blocked Fuel Filter: Look for obstructions in the fuel filter. Fuel flow to the carburetor may be restricted by a clogged filter, producing a lean mixture. Again, with the Clogged Air Filter: A clogged or dirty air filter can impede airflow, leading to a state of being too lean. As needed, clean or replace the air filter. Condition of Spark Plug: A worn-out or fouled spark plug can interfere with combustion and cause a lean mixture. If the spark plug is damaged or old, replace it. Problems with the Throttle Cable or Linkage: Check to make sure the throttle cable and linkage are not stuck or bound, since this might impact the air intake and throttle responsiveness. I have a query concerning your weed eater now: Has the problem of it only running on the choke setting recently been caused by any modifications you made to the carburetor, parts you replaced, or fuel mixture you altered? I look forward to hearing from you Craig

[@johnlight460]

@@TheRepairSpecialist the labining on the choke was reversed... Open was closed and closed was opened 🤣

[@jeevanpoovaje1147]

👏👏👍👍

[@TheRepairSpecialist]

👍👍👍

[@paulimamaeva2326]

2 stroke engine overheating

[@user-py7rr3wy3m]

how many Rpm can that engine produce

[@TheRepairSpecialist]

Thank you for your question! The RPM (revolutions per minute) that a small strimmer (string trimmer) engine can produce can of course vary depending on the make and model of the engine. Small strimmer engines typically operate in a range of 6,000 to 10,000 RPM, but this can vary. To be honest, I haven't measured the RPM on this particular machine but i would put a guess at it being something like what i have mentioned. Thanks. Craig