HOW CHAINSAW CARBURETOR WORKS: Carburetor Working inside! (by Craig Kirkman)

[@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 😊👍

[@richardredcastle7911]

Easily the best series of videos on the working of the two stroke carby on you tube. Well done and thanks for your effort.

[@brianb5779]

So glad i came across your videos. nothing i like more than an exact description and operation of something. I feel like i just went to school for free. Thank you so much, i finally got exactly what ive been looking for. Take care

[@TheRepairSpecialist]

Brian B, thank you for your positive comments. Its feedback like yours that motivate me to continue making these videos.

[@kamn1]

2 strokes are such genius design, love it!

[@TheRepairSpecialist]

They certainly are. If you would like to see a two stroke carburetor working from another perspective then I've included another link here. Just in case: kzbin.info/www/bejne/oYXPqmd4jtuUq68 Thanks. Craig

[@kamn1]

@@TheRepairSpecialist I already watched all of the 2t related videos, the down to earth explanations are wonderful, thank you!

[@TheRepairSpecialist]

@@kamn1 Thank you so much

[@Falcon_Futura]

Thank you so much for spending a lot of time to make this video in order to transmit knowledge. Best wishes from Argentina 💪🇦🇷

[@markjones3121]

Bloody marvellous. This and his other videos on the 2 stroke are 'must sees' for anyone who has problems with pesky 2-stroke engines. Watch these and you'll know what to look for when the inevitable happens and your weedwacker or chain saw wont start or bogs down when you open the throttle. He's a bit long winded and his diagrams are kinda primitive - all old school, low tech stuff - but who cares, his explanations are top notch and deliver the required eureka moment. Keep it up and don't be discouraged by the odd negative comment. You've saved me hours of wasted time and frustration. Your efforts are much appreciated!!

[@trajano411]

Congratulations for transmitting your knowledge, it is remarkable the way you do it, very clear and objective. Thanks very much! It has been satisfying my needs ( my chainsaws ) and my deep curiosity on subjects where i always felt that i could hear for hours but normally nobody would like to passionate talk for hours ! Great work.

[@christophernunn943]

Superb absolutely superb. I’ve got a carb problem on my Stihl chainsaw now I can get to grips with it confidently knowing how it works. So grateful to you for such a valuable education.

[@TheRepairSpecialist]

First of all, thank you so much for your really nice feedback, and I'm the one who is so grateful for your support. Many thankd indeed. Craig

[@christophernunn943]

@@TheRepairSpecialist thanks mate. It’s great to get precise information from a pro and not getting pointless banter. Your accent is a treat to listen too also. I’m reminded of my school days when listening to some good teachers who had the knack of putting over point and fully understanding something new. Keep up the good work.

[@danz1910]

Amazing. I also love how as a french canadian, I can understand your UK english 100%

[@thewhitetdn]

Thank you very much for doing this video. I've been a master Audi/Volkswagen auto technician for 17 years, but trying to repair my leaf blower this weekend, this is the first time I've ever dealt with a 2 cycle engine. Thank you for helping me understand it.

[@budgillett9535]

Why would anyone give a thumbs down 👎? I very much appreciate this information. Great job!

[@winstonchurchill6033]

Excellent video. I dismantled my chainsaw carb yesterday when I had a starting problem, looked at the parts inside and could not understand how it functioned. Now having the benefit of your explanation, I do. So, many thanks.

[@snowdaysrule]

I really enjoyed this video! I was taking apart my little 25cc 2 stroke leaf blower carb to clean it out, and really enjoyed being able to identify all the parts you talked about in the video, as well as learn a little about how my carb works. So thanks! :)

[@nhikoid]

What an amazingly articulate and precise explanation. Your experience really shows.

[@TheRepairSpecialist]

nhikoid, I really appreciate your positive feedback, thank you so much

[@andrewjones2973]

Thank you very much. A very talented and patient man. If only we had more people like you in this country, (UK). I wish I had you and Allen Millyard as my neighbours.

[@TheRepairSpecialist]

Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍

[@poptartmcjelly7054]

Quite amazing to know what happens inside those little carburetors and how much more complicated they are than my motorcycle carburetor even.

[@mth32871]

Excellent video explanation! Prior to watching this, I had a fair understanding of how these types of carburetors worked, but not enough to confidently explain to someone else how they worked; now I do. Thank you so much!

[@learieramoutar7590]

Thank you sir for sharing your vast experience and knowledge. I had no idea how this worked until your videos.

[@rshutterbug47]

You BLOW MY MIND AS TO How Good You Show & Tell About it & EVERYTHING

[@donjackson8816]

I can't explain exactly how this works. But when you tell me it is so realistic and easy to figure. Thanks Don

[@ikrugerr560]

that couldnt have been explained any better. ive been having problems with my stihl carburetor on my chainsaw and i am familiar with all the pieces to the carb but not their functions. after watching this video i fully understand the way the carb works and its functions. so thank you for your knowledge and hard work on this video. its was really explained perfectly.

[@TheRepairSpecialist]

IKrugerr, wow, thank you so much for your motivating feedback. It's comments like yours that keep me motivated to continue making these videos. Many thanks again.

[@ikrugerr560]

yes sir. I should be thanking you though. To be honest i had 2 chainsaws that were bogging down and would die when pulling the throttle, so i messed with the high and low adjustments and nothing. so i sat down and watched your hour video on 12 reasons why a 2 stroke engines boggs down, this was after i watched your video on the carburetor and how it works. After these videos i had enough confidence i could get these chainsaws running. I did a little more studying on your videos, then started inspecting and cleaning the carb and engine in the areas you explained. and i now have 2 running chainsaws 1 day later. so thank you for your knowledge! i have never been more inspired to work on small engines than after these videos. cant wait for more

[@TheRepairSpecialist]

IKrugerr fantastic, thank you

[@observersnt]

Thank you so much for your generosity of spirit and sharing your knowledge and experience in a straightforward, sensible, jargon free manner and for the work you have put into preparing these videos.

[@Qalaska5]

Priceless to me. Clean and simple explanation. This will help me to diagnose my Chainsaw. Thank you.

[@NirHason]

Your videos are pure gold!! Thank you very much! don't stop sharing your knowledge with us :)

[@jeffdeluca1153]

You have just literally demystifies how the 2 stroke carb functions. Thank you. Will be helpful in trouble shooting my chainsaw

[@gjensen500]

Thank You So Much RepairSpecialist! That was an amazing illustration of how a carburetor works. I certainly enjoyed the animation which clearly illustrates how the it all works together.

[@cliffmccawley1950]

A well presented and informative description of a complicated fuel system we take for granted .Thank you

[@salvatoresireci2450]

Thank you so much, this is The first time I’ve ever seen this process diagramed. Got my chainsaw going again after learning how to adjust fuel mixture on a previous video. Much appreciated!

[@ZaphedBeebleBrox]

Thanks much. I wish that all knowledge is passed honestly like this. Most educated people hoard their knowledge or sell it slowly and not honestly. Kudos.

[@AdamCraigOutdoors]

not sure i have every seen an explanation as good as this. Awesome job and thanks for taking the time to do this!

[@timalexander4890]

This is an amazing video! Thank you for your excellent explanation of a 2 stroke engine and carburetor workings. It's helped me understand enough so that I can repair and maintain my 2 stroke mercury outboard and all the 2 stroke tools around my house without a lot of wasted time. It's an easier job now. Very well done!

[@TheRepairSpecialist]

Tim Alexander, thank you so much for your motivating feedback. It's comments like yours that motivate to continue making these videos.😊

[@JC-yz2dn]

Gracias por compartir sus conocimientos es muy detallado y rico en illustration gracias por su tiempo

[@DButch15]

Thank you for the way you share your knowledge. Not just in this video, but the others I have watched. Your diagram helped me a lot. Very much appreciated!

[@dannyboy768]

Thank you for providing such good education for free

[@TheRepairSpecialist]

dannyboy768 thank you

[@LucozadeClw]

excellent animation making the mystery carburettor simple. I could never understand how they worked without a float chamber and especially when running on it's side or upside-down even. now i know!!

[@zamfly99]

Thank you for giving a very clear and details explanation.👍

[@WV591]

The amount of work & awesome presentation this English puts into his video. Amazing. auto TU

[@BearE9090]

Your knowledge and experience should be put to pen and paper. It would be great to have a book on your repairs open on my work bench instead of my screen on my phone getting dirty. Fantastic job.

[@TheRepairSpecialist]

Roy E, hi, thank you for your great feedback. I really do appreciate it. Great minds think alike, I'm actually on the case with with paper form. Hopefully I will have something worth reading soon. Thanks again. 😊

[@bebopalooblog2877]

It's my understanding that rather than "ready pressure" (which a conventional liquid can't actually hold on its own) the fuel comes in on one side of the diaphragm on the intake stroke and is pushed to the other on the power stroke through another flap valve over a port in the cover. The same diaphragm movement which draws the fuel in to one side, pushes it towards the needle valve and return line on the other. On the power stroke the opposite movement evacuates the reservoir in the cover, moving the fuel to the reservoir in the body. The goal being to avoid pumping fuel through the jets under crankcase pressure, but rather allow it to be drawn in under atmospheric pressure. At least that's how a see it. Regardless, each one is a brilliant little masterpiece of industrial design. Minimal parts, simple construction, inexpensive materials, adjustable, versatile, gravity-neutral and durable. An astounding mechanical accomplishment in the palm of your hand for a few pounds and pence. Beautiful! Love your videos! Keep up the good work!

[@japojo1958]

Excellent explanation! Thank you for doing this for us laymen.

[@patrickburgess3254]

Awesome video lots of information thank you so much.

[@sunnysacto]

Knocked it out of park, best ever on these lit' guy carbs. Seems that my reed valve may be leaking or another finely tuned carb part. New Carb kit fix is on the way.

[@cheekychapman1]

fantastic presentation - loved it!

[@ianfryer1967]

Well done Craig, another brilliant description. Please go back a stage and show me a diagram of the pipe runs from the fuel tank, to the fuel pump

[@ZuraMotorized]

Helped me alot to make a separate gas tank❤❤❤❤

[@lmdetect]

Great job sir.

[@jarrettparsons8924]

Good on you. Excellent discussion of how carbs work.

[@ΗΛΙΑΣΑΓΓΕΛΟΥ-ε3σ]

Very nice videos!!!!@ Thank you for sharing with us your knowledge.

[@TheRepairSpecialist]

Thank you so much for the nice feedback. I really appreciate it. Craig

[@alexlubow2528]

Simply brilliant tutorial.

[@dineshr93]

Thanks for the good demonstration. That is a very clear explanation

[@sundial6919]

Excellent tutoral on this topic . Thanks

[@d2sfavs]

cool video.going to covert my 2 cycle engine with an external pulse tube using a cheap available carb.thanks

[@VincesEngines]

Great video thanks for simplifying something that has been baffling me for some time.

[@shango6164]

You are an outstanding instructor, I appreciate how you made this so logical and easy to understand. I think I am becoming addicted to your videos, I am finding myself binge watching. Just one thing I want to confirm, at around min 2:35 where you talk about the pulse line, that would be fuel and air mixture acting on the pump diaphragm, right?

[@arthurfricchione8119]

Another excellent video Craig. Your animations are spot on mate. Cheers Artie ❤️👍

[@TheRepairSpecialist]

Thank you so much for the nice feedback. I really appreciate it. Craig

[@ljmini732]

Thanks for all info on this, really help me to sort my McCulloch blower

[@johnlocatelli1768]

Excellent tutorial. Thank you for sharing.

[@kulandaivelsundararaj8985]

Thank you, Thank you so much. Could you please explain why fuel is leaking through the venturi?

[@marvinallen8935]

Just started doing my own repairs, and with all the research, I've understood nothing more clearly! Thx...

[@TheRepairSpecialist]

Great to hear! Thank you so much for the great feedback

[@hercegmj]

Thanks. Easily understood explanation.

[@TheRepairSpecialist]

Thank you for your positive feedback, I really do appreciate it. Thanks again.

[@cosminhusqy3138]

Nice video! 👍👍👍

[@rudiberrange3387]

You help me so much...thank you for sharing your knowledge with us

[@TheRepairSpecialist]

Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍

[@donspersona4800]

learn so much really great teacher all your videos big help,understand ing carburetor functions

[@matthewmahadeo6997]

Great job man

[@TheRepairSpecialist]

Thank you 👍

[@justharryjohnson7250]

How much pressure can the diaphragm produce. I'm asking because I want to fit an inline fuel primer bulb. This has a one way valve and can be bypassed with breath from my lungs so way less the 1psi. But will the diaphragm be able to easily pull the fuel through the primer bulb or will it wear out the carb quicker or even worse run lean because the fuel is not being supplied easily enough

[@palibhandal]

you are the best in your field.

[@TheRepairSpecialist]

It's feedback like yours that really motivate me to keep making these videos. Thanks so much, Craig

[@MegaHugro]

Brilliant job!

[@joshriver75]

Your work is appreciated!!!

[@GazYT1285]

Great video, the explanation shows your knowledge 👍. It’s helped me understand the process more clearly, but unfortunately, I’m still having the same issue as before...my carb continues to flood on my RC car and would be very grateful if you could help me with the problem I’m having. Cheers and all the best. Gaz

[@Jari_Kuusisto]

Thank you so much for very good explonation :)

[@TheRepairSpecialist]

Thank you for your comment. I really appreciate it.

[@bstevermer9293]

Again amazing!! More more more!!

[@amadigodwin437]

Good work. Very explanatory.

[@AlfredoSwift]

Excelent!!, Thank you so much!!! from Valencia, Venezuela

[@jaakkooksa5374]

What can cause a chainsaw to sometimes idle way too fast and at other times too slow? Since there are no moving parts involved in the jets themselves, one would expect that as long as there is fuel in the metering area, nothing could work differently, so as to explain the difference in the idle speed, right? Is it possible for instance that the metering needle valve does not close properly, so that fuel pressure in the metering area is higher than normal, forcing too much fuel through the jets, and then the saw might idle too fast?

[@CHIBA280CRV]

I enjoyed watching your Faaaaannntastic , informative video. Thank you for making it and sharing it..

[@robertgilmour8110]

Thank YOU so much

[@TheRepairSpecialist]

You are very welcome

[@RegSchmo]

Marvellous explanation. Would like to know where the pulse line is on a Stihl carb though??

[@ngl-kd7tn]

Excellent Video

[@bstevermer9293]

Can you ponder this? How is this made so precise and sold for $10. It baffles me...

[@neiltaylor4019]

Hi could you possibly tell me if the main jet or theH jet and the L Jet have any neoprene rubber in them.Great video many thanks.

[@donnajohnson2584]

Thank you so much Sr. know I know how those little things work.

[@TheRepairSpecialist]

thank you so much for your positive feedback, its very much appreciated. Thanks again.

[@Hydrogenblonde]

The more times I watch this the better it gets.

[@TheRepairSpecialist]

Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍

[@lukeloader]

Great video very informative.

[@TheRepairSpecialist]

lukeloader, thank you for your motivating feedback.

[@andrewwilson5631]

This helped me understand it a lot. Thank you.

[@normanziegelmeyer7693]

Excellent presentation, even I could understand it :)

[@josephasmr5241]

is there always enough fuel inside the carburetor to start the engine or does it need pumping? does any fuel enter the cylinder directly after turning the engine off?

[@rackum44]

I rebuilt my mikuni carb today it's for a 92 Yamaha waverunner 650. How high should the control arm be?When I placed the diaphragm on, the little piece of metal in the center of the diaphragm seems to be touching the top of the control arm. Should there be a little space between the two? Thanks in advanced

[@jamesrice3910]

I have a request for a video on the purge/primer check valves on a zama carburetor c1u-w43. There appears to be 2 methods for these check valves to work. One has a little red valve that is under the buld. The other has check valves that are built into the body. I have both of these. The problem is I ruined the one that has the check valves built into the body by running a wire through them. I was wondering if you could do a video showing how you could repair this if possible. Also, maybe do a video that says don't run a wire through these types of check valves. Also, it would help if it was better explained how they work. One of your videos mentioned a spring and a seat, but didn't explain where they were or how they worked. Thanks, Jim Rice

[@TheRepairSpecialist]

Hi Jim. Yes, well said. I will look into adding that to my list. I noted though, that you had looked at one of my other videos. Was it the one in this link? If not then this might be a very good place for you to start. It's not exactly your type of carb but it is close. It will give you a good idea whats going on. Again, i'm sorry if you have already seen this. Thanks Craig : kzbin.info/www/bejne/oJLPl6OlocmspZI

[@DanA-uw2nd]

WOW! Now I know how it works. Thankyou.

[@trevorwallace2323]

Wow i didnt really understand a carburetor until i payed attention to this video. Everything is important for it the function properly

[@ripjaws6229]

Wow awesome explanation thank you so much

[@wakefieldyorkshire]

Thanks a lot for this informative video, subscribed and thumbs up. THANK YOU

[@Shlomi_Azulay]

excelend video!! maybe you can help me: i have walbro 997 carb all settings is deafult, my pistone ring is ok, fuel tank and the hole are clean, pulse carb is clean, gaskets new. the problem is when i get full throttle and left the engine die, hope that you can help me, thanks :-)

[@unipreviews3301]

Thank you sir

[@kevinmckenney6845]

Wow thanks for your time that was great

[@STUDENTOFARNIS]

Love your videos

[@wotjonsez2560]

Very good, thank you.

[@1234tric]

To the Repair specialist: What is happening when the trimmer starts great, and goes into it's idle stage and then dies. It just won't idle. How do you fix? Is it the metering arm out of adjustment problem? Can you answer my question about this problem? Thanks!

[@nestorbl2105]

Check the tubing coming from the tank and if it is one coming from the crankshaft check it too. The ends should be tight as the pulsed gas pump is not forgiving of even quite small leaks that allow air to enter the lines.

[@josepeixoto3384]

Just *GREAT* Thank you.

[@steveforrester2217]

Great video. thanks

[@xx3868]

TOUGH WALBRO Carb problem i have if anyone want to try and diagnose? for whipper snipper (wacker?)- if anyone can help as this is REALLY tricky problem with fuel starvation? pulse hole? I get full power right through the range and idle ok and plenty of fuel left on the screws so fuel pump and flow seem to be GOOD. BUT after a while 10-30 mins she starves off and a quick flick of the choke saves the engine so indicates fuel drop off OR air leaking in suddenly ? i have cleaned and checked every passage and orifice short of Xraying it and all new parts of everything on it and filters ect. If the pump or lever height was too low or too high , i already tried diff positions but it still starves off after a period? and starts ok so getting fuel when col or barely maybe? Maybe the worn compression limiting the pulse channel as it dosent have a reed valve, just the hole the piston slides past. Hot piston or vaporisation causing fuel to drop off after a while? Inlet gasket surfaces all flat and multiple new gaskets so that cant be a bad gasket or idle would be affected but not when tons of of air needed, a small leak wouldnt shut the high speed down as it is now intermittently. Last time i used it was fine then for 5 mins i couldnt get it above half power even winding open the H screw, THEN it came good and roared perfectly again?? Perhaps pulse. pump pressure is minimal with low compression and its on the edge all the time and the thing just starves suddenly . I squirted a little oil in the pulse hole plastic boss and pull the handle and the oil didnt seem to move much. I might check the rings as its bit easy to pull over unlike other that pull tighter like there tons of compression. Pulse too weak? but why roaring for 20 mins plenty of fuel available on the H screw, i could easily exceed 9000 rpm. Never had a car carb do this . it either is sick or perfect for 10 years when set . Yes these are diff operation , but this machine/carb has had this fault forever it seems, always troublesome. i even put a chinese carb on it and that wasnt right either. Maybe it is a pulse weak problem. If i connect a vac gauge to the fuel inlet, i see no movement, should it pulse left and right of 0? Just too weak engine now? or borderline? as it does go nuts then die?? weird. Never had a engine that failed like this that i worked on. Perhaps a bleed crack somewhere letting in extra air ect?