How to Rebuild a Two Cycle/Two Stroke Engine Carburetor

In this video Mark shows you how to rebuild your two-cycle engine carburetor using a manufacturer's rebuild kit. Parts in the carburetor wear down due the the ethanol content in gasoline, so it's important to maintain your carburetor when parts begin to crack and become brittle.
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Don't forget to LIKE and SHARE this video to help pass along helpful information to your friends! Your feedback and inquiries are also welcome so let us hear what you have to say with a comment below.

[@FIXTechGuides]

@memberson Good question. It's true that most carburetor rebuilds should include a cleaning as well, either with carburetor cleaner or--like you suggested--with an ultrasonic cleaner. There are two reasons why we didn't include a carburetor cleaning in this video. 1. We already have two carburetor cleaner videos posted explaining the procedure. 2. We want to keep the focus of this video on just rebuilding the carburetor. Because of your comment, we may annotate this video to link to the others.

[@FIXTechGuides]

So far I haven't found carb that wouldn't run like new with just a good cleaning with the Welch plug left in place. Removing the plug would complicate the repair beyond what most of our viewers would be comfortable doing. A Welch plug removal video is a good idea and I will definitely add it to our list. Thanks for watching! -Mark

[@ITUMBLE4U]

I'm a big fan of your videos and have used several to rebuild various tools/equipment. I'm surprised you didn't suggest blowing any air through the fuel line pick up/purge lines or using any carb cleaner on it. Any reason not to?

[@Sky1]

clean it and make sure the ports are clear before reassembly

[@JohnJones-wo8dw]

Just come in after watching your video and rebuilding my Walbro carb. Brilliant, easy to follow instructions. Strimmer now starts and runs as good as new. Thanks for sharing your expertise.

[@jawz1946]

Mark < Do you have any video's for sale on reassembling a chainsaw ( crankcase to starter assembly) .I have a Husqvarna 445 . engine I need to reassemble and would like some assistance . Thank You // Sonia A

[@FIXTechGuides]

+John Allen All of our videos are on line and free to help with your repairs. We don't have any going as deep into the engine as that. There may be some online. They are usually free to view.

[@shaggyda2758]

Husqvarna 455 rancher teardown and rebuild, bolt for bolt! part 1 on U Tube

[@davevanschuyver4536]

I watched your video and ordered carb. parts for my weedeater featherlite. Your lady was very helpful. Parts worked like a charm. Thanks so much.........:) Dave in Kansas

[@andrewtaylor1662]

Finally a video I can learn from because the closed captioning was clear! I'm deaf. Many thank yous!

[@brutonuk]

when you replace the needle lifter you NEED to adjust the lifter using a tool

[@loverofyahshua]

My friend handed me a craftsman blower, 32cc. I discovered the fuel line broken. I was able to make it run. But, it will not idle. Do you think this 12 year old blower, might need new carb gaskets?

[@FIXTechGuides]

That sounds like the fuel lines to the carb might have been crossed. Take a look at at our video about how to replace fuel lines. It will help to confirm the correct line placement. Thanks, -Mark

[@ngas10]

I have a husqvarna trimmer 128R (Zama carburetor C1Q-W40A), which is suitable tool to remove the set screws of the mixture? Thanks in advance. Living in Brazil. Nelson Silva.

[@spaderism]

Hi Mark, Thanks for the video! I am about to go try out a rebuild(something I never thought I would have tried due to horror stories I've heard about the process). Your video was clear, concise and professional. I am impressed. Thanks again, I will let you know how it goes.

[@gregles1180]

Thanks Mark, very informative and well carried out

[@Dishtech48]

I would have taking the time too have blown the Carb out with air,before I put it back together!! There could have been foreign matter fall of the screen,or anywhere in carb. Don't skip this step...Thanks

[@1HBPlayer]

Ok. In this video, you assemble carb, gasket, diaphragm. In the "cleaning" video, you do the opposite. But this time, you re-assembled the same as you disassembled, I think. Not being critical; i'm just looking for clear direction. I do appreciate this video.

[@arthursmith3154]

Thanks for the good video... I have a Stihl weed eater model FS 55 about 3 years old. I can crank burn one tank of gas then when I try to crank. It will fire up about one time shut down and won' start. I think it needs carburetor rebuild kit. What are your thoughts? Thanks, Art

[@jaker5555]

Thanks Mark. That part that goes in the hole under the needle/spring at 5.12 was my lesson. Didn't spot that on my McCulloch Powermac 6 when I pulled the carby apart in the first two occasions. On the third dismantle, I pulled it out and cleaned the channel. Put it back together, and fired up after a few pulls. Adam. Australia.

[@rayrogers5758]

+jaker5555 Yes mark left out several key points like cleaning, and adjustment in an outside of carb

[@pward17]

too clean but that's the only complaint, great video very clear

[@buddyfrederick121]

you just won a new customer! Thanks for the well-explained videos! You Rock!

[@mfbradley]

Good information saved heaps of time 😎

[@allanwells4886]

Top video; thanks very much. I've just rebuilt the Walbro carb from my Mitsubishi grass trimmer using your instructions-VOILA! Goes like a charm. Thanks again.

[@jorg0370]

Thanks for posting, I liked the way the parts were laid out. A simpler rebuild, left out discussion for cleaning and also adjusting the needle lever.

[@larrylund2682]

Thanks! I had it right but, just wanted to confirm before I buttoned it all up. Huge help. Really hate finding out I did something wrong when going to start the machine.

[@ewowen]

Fantastic video. Thank you!

[@robertmcgonigle3032]

Thank you. Excelent procedure. I just cleaned a lawn mower carb. for the fist time from another video. Never attempted this work in the past and I am 53. Now that I have seen the steps I feel confident to rebuild the carb. on my Dad's chainsaw.

[@steveweinberg3272]

Great video. I've disassembled that exact carb and cleaned it with a Carburetor soaking cleaner on several different 2 strokes. Sometimes it fixed the problem but from now on I will buy a Carb Kit and do it right the first time. I've started using only Non-ethanol gas in all my small engines, it really cuts down on gas line disintegration. Two strokes are very simple engines but if you let them sit without draining the ethanol gas for more than a month you will get dissolved plastic!!

[@noahloves1]

Please explain if it is possible to put your needle lift bracket on upside down. I fear i did this. Now my primer bulb collapses on itself. I thought the lil lipped ring on the needle lift bracket or Fulcrum is what one end of the spring goes up against. Now THERE'S NO PISTON MOVEMENT TO THE NEEDLE. ANY HELP? And could you tell me what model carburetor goes to a weed eater power pro edger. Thxs a ton. Robbie

[@FIXTechGuides]

It is possible to get the lift bracket upside down. That could cause the primer bulb to collapse. I would open that carburetor again to see if that is the problem. I'm not really sure anything else you cause the problem. Send me the model number to your Weed Eater Pro Edger and I'll be happy to get you the price and availability for the Carburetor.

[@kevingander]

Thanks you so much for all your simple to follow repair vids, saved me a fortune and also given me the satisfaction of doing the repairs myself. Top man. 👍

[@tonyclo9110]

Great video. Thanks

[@FIXTechGuides]

Glad we could be of help!

[@ignantmike]

thank's mark....helped me big time

[@Heather22056]

Thanks for the video...

[@gottaflychris]

Very informative video. I'm feeling braver about attempting the repair myself.

[@TheShaddy123456]

I have wt 990 carb. I recently bought new and only after a few tanks it stopped delivering gas. The punter bulb was full and it ran perfectly the prior day. What could be the cause of this ? The fuel filter was recently replace about the same time the carb was,Also I'm running this carb in a very dusty environment, How necessary is it to place a filter over the small inlet hole on he rear of the carb to prevent dirt from entering it? From my understanding the carb partially breathes thru that tiny square hole just below the primer build ? Thanks

[@FIXTechGuides]

It's unusual for a new carburetor to give problems so quickly. The Ports on these carburetors are so small, the smallest bit of debris can plug them. Sometimes the diaphragm in the bottom of the carb gets damaged. The diaphragm acts as the fuel pump so if it is damaged or not working, the tool will not run either. Ethanol is really hard on these smaller carburetors.

[@MFL92028]

You left out a lot of important issues related to cleaning, and adjusting .. anyone can buy a kit, and replace the new parts with the old. As you say.. "it's really quite easy" Knowing that, why did you bother making the video? The idea is to get the motor running properly with the new rebuild, and understanding why the carb was failing in the first place, what to watch out for when an engine starts, runs a few seconds.. then quits. Stuff like that .. something that might really help the home fix-it person save a hundred bucks.

[@artgoat]

Some mention of the check valves (which can also require replacement) would have been useful. If the primer bulb is sucking bubbles no matter how clean the carb is, the check valve is probably bad.

[@LeveeJohn777]

Thank you very much, this is EXACTLY the information I needed to get my old Stihl trimmer running again!

[@gavinstrang7284]

Hi , I bought a brand new maverick for Christmas, it has done 4 tanks, but last two tanks it was cutting out, and dying down, noticed that tankis sucking itself in, took cap off tank, and it hissed, but now it will not start at all, engine sparks, but will not fire, high and low spd needle has been adjusted, should I try readjusting them from factory settings again, any idea.

[@FIXTechGuides]

I would set the carb back to the original settings. The problem you've described, even though its a new tool, sounds like a plug in the carburetor. Try putting a drop of fuel in the carburetor throat to see if it is a fuel issue. Also, most of the caps for these are vented to help control a vacuum issue in the tank. Thirdly, if the carb is plugged after such a short time, check inside the tank to see of the fuel filter has become unattached.

[@youknowvin]

I was surprised that he didn't take the opportunity to blow some carb cleaner through all the ports. Shoulda pulled adjusting screws too if it had them. In related video he used carb cleaner sprayed down carb throat to start the engine. Maybe OK but it seems carb cleaner would strip away all the oil in the cylinder.

[@ultrakool]

he used starter fluid, not cleaner

[@ghostmoh3442]

Hi when I use carb cleaner it just keeps shooting down after a few seconds is it just the diaphragm our something else I double check the gas theirs no water in it an it's not a electrical problem the sparks plug is new help please.

[@ultrakool]

could be: bad coil? too high/low compression?

[@dwayneb1644]

Ours has 2 red screws that only allow 1/2 turn, you don't know them on this? Are they the l and h adjust or caps to stop further adjustment?

[@FIXTechGuides]

Some of the carburetors have the limiters on the air adjustments that do only allow 1/2 turn for adjustment. The EPA has changed their standards. Most of the carburetors are set at the factory and the air adjustments are capped so there's no adjustment and others are jetted internally.

[@jimfstein]

Very helpful.Have WG - your process is excellent.

[@randallmontes9126]

What's the best way to clean the carb. I have changed all parts but it still won't run, I think it is a jet or port that is blocked. The one in the throat I can't get to or remove.

[@FIXTechGuides]

+Randall Montes Your right. Some of the ports on these are very small and can easily plug. I've had the best luck with carb cleaner and atube. If it still won't come free I use an Ultrasonic cleaner.

[@LUVKUZIXO]

I have a viza v2 gas scooter, it takes a while to start up and when it does it just dies down when i press the throttle.. any thoughts? Is it just the carb?

[@byrysh]

kam maldonado if it has good compression its the carb. If not compression ring is bad. rings are bad

[@ktanchau]

You are a good teacher . We can follow you easily . Thanks .

[@Australia4031]

Excellent video very helpful. Thankyou

[@theresablair9262]

good job thanx alot this was very helpful.

[@goddale2002]

Hey Mark, I have an Echo PE 200 edger. I replaced the throttle body that somehow was broken on the inside of the carb. Once I was done, the unit would start and run but not while in idle. It only runs if the trigger is fully depressed. I replaced the spark plug, gas lines and grommet, air filter, gas filter, bulb, rebuilt the carb and changed the intake gasket. I use new fuel and oil mix. I used carb cleaner and air. Made sure the spark arrestor was clean and my edger still stalls when I release the trigger. I'm out of ideas??? Help!!

[@chijanngo]

Good video ! Thanks !

[@djbruss0859]

My TORO single stage snow blower(38445) carb. appears to be a composite material. In another of your super videos you show the use of a 'Lyman Sonic Cleaner' to really get the job done. My question is does the composite carb. hold up in the Lyman without damage, does it require a specific milder cleaner, should cleaner not be used at all. I know this question is a little outside the realm of this re-building video, but, I would need to cover the carb. body question in my attempts on the rebuild. Your carb body appears to be all metal. ??????

[@JarrodZerr]

He makes putting the needle valve back in look way easy. That was a pain. A tip, if your carb has a primer bulb on the top, rebuild the bottom first so it sits flat and you can get the needle valve in easier! No, really, do the bottom first, you'll thank me later!

[@leelafarlett3535]

Has anyone bought any of those smaller weed eater echo, etc. new carbs off the internet that sells any where from $6 to $20 or so? The $6 to $10 ones are from china and says two to three weeks delivery. The ones from $12 to $20 are here in the U.S. and ships in two or three days.If they work like new, I'm never going to rebuild another carburetor.

[@SurferJoe46]

I find a lot of warpedparts, like the Thicke aluminum over with the single screw. This seems to be the situation on mostly the Chinese versions that some manufacturers use now. What I've been doing is surfacing them one a piece of 180# wet/dry paper, masking taped to the surface of a piece of glass. These warped parts are showing in Craftsman/Poulon and a few Stihls. Husky has not had any that I've found to be Chinese.

[@tpilot1]

HELP. I bought a new kit, but still got trouble that its not priming with the bilb, I see that the valve in the prima goes straingt to bottom of carb? all cleaned, Any help

[@jeffminton6454]

You do a great job! Thanks.

[@jameslin8026]

I don't understand why some 2cycle carburetor don't have rebuild kits. like homelite 26bv carburetor #308028007 Do we replace the whole carburetor in this case?

[@FIXTechGuides]

+James Lin Some of the older carburetors are not EPA compliant and some of the manufacturers suspend the sell of parts and kits for this. Luckily in this case there is a replacement carburetor.

[@Hunyoatnobyembre]

+eReplacementParts.com our grass trimmer will starts but after a minute stops. i think i need to replace or rebuild its carburetor. where can i purchase it? it is a Kaaz Td40 unit.

[@bsully2]

When do you know that you need to replace the Welch plug? Do you just puncture the plug and pull it out in order to replace it? Also do you seal the plug with anything once it is in place?

[@les4lifepaul]

I agree with Mark, i have fixed many of these small carbs over the years and have never remove a welsh plug, and so far, never had one I couldn't get to run. 99% of the time take it apart clean it and you won't even need a kit. They take a little patience and experience but these carbs are hardly rocket science.

[@dannymagoo]

I rebuilt mine using your video as a guide as I did it. My problem still exists the thing wont run. I have a troy bilt string trimmer and it just decided not to start this season.

[@arado240dd]

good job, but what if the needle and seat leak, youll flood the engine

[@brucehampton1545]

I have a sears self propelled mower engine model number 143..986700 and I took off the bowl of the carburetor and used a bread tie wire to put in the holes and cleaned real good then replaced everything. The mower now acts like it isn't getting any gas at all. Before it would start and would stay running unless constantly priming huum what can I do now and a few questions if you don't mind. Why on earth does just a new kit make things all better. I don't know what the gasket type thing that goes on with the gasket actually does and I also have a lettile tube that sticks down from the carb and goes into the botton bowl not sure what that does either and I may in fact have a spring missing but wasn't sure ass I didn't see one when taking apart. I couldn't find a video for this particular carburetor. Thanks for any help.

[@FIXTechGuides]

+Bruce Hampton The reason a new kit helps is usually because most carburetor have a rubber piece in them that acts like a fuel pump. Over time the rubber becomes less pliable causing the motor to starve for fuel. You can usually tell the rubber is getting old by having to keep priming the mower to keep it running. These carbs are commonly made by 1 of 2 manufacturers. If you have the carburetor off it should either be a Zama or Walbro and kits for most of these are readily available and pretty well priced. The whole craftsman carb is available for around $96.00. If you can find any numbers on your carb, write back and I'll see what I can find to get you going again.

[@brucehampton1545]

thank you

[@mythril4]

I remove the welsh plug to clean the tiny jets inside. Besides, to remove it you srill just through it's surface, use a pick and pluck it out. To install the new welsh plug, set it in place, use a small round tube one half the diameter of the plug and give it a couple light wacks to stretch the plug out into place, easy.

[@richardf512]

The needle valve & spring reassembly with 76 year old eyes and fingers is a bit slower and requires the use of multiple words not generally used in mixed company.

[@RandallFlaggNY]

My spring did indeed go "PING" across my workshop and was lost to history. Now I have two replacement springs on order, and the weeds have not been whacked....

[@ellisonrepair]

Nice video Mark. Only one comment or question. You didn't show the correct metering lever height. I believe on this Walbro, it should be even with the carburetor machined surface. Eric

[@LLStacheLarry]

I guess I'll have to start all over I went through that and still doesn't work right mine is different both tubes you hock the hoses to are on the same side I have wt520.

[@tdnick60]

I did all this but I have 1 question I have a blue gasket, where does it go? And On the primer bulb, or under it, Is there a gasket

[@paulmarkowski9794]

Thanks, Mark. With the kits not having printed instructions, this video was very helpful, organized and brief- perfect. Wo ever liked the printed instructions anyway? With all the junk on u-tube, this is certainly one of the jewels- Thanks!

[@raymiller777]

Hi Mark, I have a ryobi 700r. It will run on the primer bulb. I cleaned the carb but no fuel getting through, Any thoughts?

[@FIXTechGuides]

I would try to clean it again and replace the diaphragm. The ports in these are so tiny it takes next to nothing to plug them and they almost impossible to open once they are plugged.

[@byrysh]

Ray Miller oh man... get a very skinny piece of wire. and wiggle it in all the little holes. Buy a can of parts cleaner with a basket and let it soak for 24 hours. And then blow it out with comprssed air. If it only runs on the primer reed valves arent working and letting fule be pulled in. rebuild with he right kit.

[@tatenormandin8724]

what if the new gaskets or reed valves are not identical to the ones on the carb already? can I use them or did I buy the wrong kit?

[@jted68]

Thanks..... Very helpful video. I followed your advice exactly and had no trouble whatsoever completing the rebuild. I found it helped to use a bench-mounted, lighted magnifying glass to install the needle valve/spring assembly. I also installed new fuel lines and a carburetor gasket.... The old IDE weedeater started on the third pull. :)

[@MMFoliage]

So where are the o rings, rubber pieces etc that supposedly get brittle? I need to rebuild mine as I left gas in it from last year.

[@bfriendly100]

Best video like this I have ever seen! I just received my kit and should have no problems rebuilding my Ryobi Carb that uses a Similar Diaphragm, rather than a Float. Thank You!

[@jamesnall6921]

nicely done. even I as a mechanically challenged individual should be able to do it. Thanks for doing this. the job at hand is to rebuild my chain saw carbuerator. I got the kit from a local shop after taking the carbuerator in to them to verify the P/Ns.

[@hoopy1318]

mark is this video the same on my stihl c1q-s97 carb to rebuild or do you have that video for stihl carbs thx

[@powas13]

Very informative. Nice simple video. Confirmed that the film I found on top of the screen was not an important part but indeed just junk that was clogging operation and needed to be removed. Thanks.

[@maxmouse8276]

so do the hoses need to be air tight, and also does the bulb when you prime it always is it supposed to always have fuel in it....

[@leapord503]

That's interesting. I'm 15 an I know carbs normally with the bowl and floats. Last time I did a carb like this it was on a 1978 little buster go cart. Same process and everything. Thanks a lot!

[@dbrown51spoke]

thank you so much saved me

[@mikedundee65]

Thanks for the video. I didn't realize there was a spring for the needle pivot until I watched it. Fortunately, I found it.

[@HazelAndrewsAcupuncture]

great vid, it's given me the confidence to rebuild the carb on my mantis. Not sure if it will fix it...bit it will be fun trying!

[@djordan4056]

Mark Great video, question is what is the setting for the needle valve? That would be good to post.(in thousands of an inch) Thanks.

[@MENDOZA84PHANTOMBLAZE]

When the rubber gaskets inside carberator get hard does it flood the and leak gas out the carberator

[@albertogranados6520]

por favor escribir referencia de kit de las partes de este carburador, gracias

[@TrakturBuff]

OMG! I watched this video and could not believe it could be that easy. My Echo SRM 2400 circa 1993 is running like new after years of sub-standard performance.

[@rattmann36863]

Great group of help vids. I will be coming back, and ordering parts. Thanks.

[@StagrLee]

Didn't see that the video mentioned cleaning (maybe I missed it). Teardown -> Clean with carb cleaner -> Rebuild.

[@TheHarvey1941]

I like Marks videos and eReplacementParts; many hours watching the videos.This one helped me rebuild my 1994 featherlite carb...yesterday!

[@lucianopires3983]

Excelente. completo didatico. eu estou sem dinheiro e busquei um melhor video que me ensinasse a limpar o carburador de minha moto serra;muito obrigado; forte abraço,luciano

[@adansaenz8752]

Is this carb similar to a zama off a echo trimmer srm210 to be exact?

[@ross4329]

Where can i find the fuel lines for the WA 226? mine is a craftsman weed wacker?

[@willmagoo43]

Mark,,Your video is very helpful.You are so knowledgeable and make it so simple.. Thanks again for this video.

[@mickey52149]

hey thanks mark , been a while since i done one , guess zama are the same as walbro to rebuild

[@prigkipastouerwtismou3992]

Mark thats the same way to rebuilt a carburetor for a aqua scooter?

[@tommcbride8328]

I thank you....that was very short and sweet and interesting as we'll ...real good job , thanks again

[@buckm4313]

Mark --- before you removed the base plate, the hole in that plate was oriented at the top of the carb. When you reinstalled the plate, the hole was positioned to the side of the carb. Does this make any difference?

[@FIXTechGuides]

Hi Buck, and thank you for your question. As near as I can tell, the base plate is simply a cover for the carburetor and therefore it probably wouldn't matter all that much. However, I would advise re-assembling the carburetor exactly the way you took it off. It must have been a simple oversight in this video. Thanks again for the question, and good luck with the repair!

[@jberzinski2]

good video i just had a issue with fuel lines on chainsaw and thanks to these videos it runs like new

[@jimmiejameswright1309]

Great video, I took it apart and forgot how it went back together, it shows me how to do that. Thanks Mark

[@prakashamendra7027]

Please show video on replacing carburetor parts on a Husqvarna 455 Rancher Chainsaw.

[@FIXTechGuides]

+Amendra Prakash We don't have a video dealing with your specific model. The following link shows how to work on a 2 Stroke carburetor. Most are basically the same as far as the repair goes. www.ereplacementparts.com/article/4582/How_to_Clean_a_2_Cycle_Engine_Carburetor.html

[@elmuneco53]

All of u videos are helpful.. you the man .. thx for shering

[@alisalemhumaid7123]

Thanks :)