Been working on a Walbro carb today on a strimmer and this tutorial has helped immensely with the workings of one .Thanks for taking the time to explain everything ,my head didn't hurt at all watching the video.
Hello! 🌟 Thank you ever so much for your kind words! I'm thrilled that you found my explanation helpful and that it resonated with you. Teaching and sharing knowledge is a true passion, and it's wonderful to know that I could assist you effectively. If you have any more questions or need further guidance in the future, please feel free to reach out. Keep the curiosity alive, and happy learning! Craig
Thank you very much sir,your videos should be required course work in school. Having this instead of half-assed metal shop would have saved me so much time
Excellent, brilliant, really outstanding explanations and description for this carburetor. I would not have thought that it was so sophisticated. I can now work and repair the exact same unit that I own ! Great thanks !
I just picked up a free non-running 49cc sit-on scooter and have no knowledge about two-cycle carburetors. I've removed all components from this scooter to overhaul everything. This video is insanely helpful for me, thank you!
Wonderfully done tutorials - I finally feel that I understand how these little carburetors work. There's one thing I didn't see in them - some of these carbs seem to have a little one- way valve (not a reed type consisting a flap of plastic sheet) situated between the gas chamber immediately under the main diaphragm and the point from which gas then gets to the carburetor's throat. There are often three separate lines leading from that point to those holes spaced along the throat - one or two of which may have flow adjusting needles. That valve is especially troublesome because it's in a blind hole and can't readily accessed. One thing that seems to get them working again is to forcefully inject hot soapy water into them with a Water PIC. That's also the best way I've discovered to blast particles/crud etc. out of any of the other holes & lines. It's more forceful than is compressed air and has the additional advantage of being visible - water squirted into a orifice should come out somewhere. Anyway, I've got a question: Most of these little engines seem to have "corrected" compression ratios", (total volume above the piston's exhaust port /combustion chamber volume) of about 7:1. Consequently, it seems unreasonable that one should expect to see cold cranking (with the pull cord) compression test results as high as the experts often recommend; e.g.," >150 psi". Because the heat capacity of the gauge is far greater than that of the air being pumped into it, it seems that the highest absolute pressure reading that any such engine could generate under such conditions would its "corrected compression ratio" times local atmospheric pressure; i.e., at sea level, 103 psi ( 0.7 MPa). Is that reasonable?
Impressive tutorial ! Incredible that someone took the time and effort to make a so well crafted tutorial on something like this, a small carburetor. So good that hundreds enjoyed it! ¡gracias por compartir!
Hi I wanted to include this video because many of my viewers have mentioned to me that the carburetors i have shown in the past look quite different to their carburetors form their Strimmers and Chainsaws. This particular one in this video is such a Carburetor, which is indeed quite different in structure and function to the conventional two stroke cycle carburetor. This one also has a primer bulb system fitted and both the metering system and the fuel pump system are on the same side of the carb. This is quite different indeed to the more common type of two stroke carburettor. I hope this is of benefit to you. Thanks Craig
@TheRepairSpecialist - Bula vinaka from the islands of Fiji. A very well and detailed explanation. Hats off to your hard work and preparation for this video.
Very well done sir i have three scooters a 150 cc and a 250 cc i'm working on now i got a better understanding of what i'm doing now on the scooters that mixes the oil do you have any videos on that.
That was fascinating and brilliantly explained….two questions though…..1. Would I be right in assuming that you cannot then over-prime by pressing the bulb too many times - simply because the engine is not yet running?….2. Is it possible to test the carb by, firstly removing the spark plug, holding open the throttle to release the jet seating and pressing the primer bulb in order to force fuel up into the Venturi? ie would I be able to see file spray and so deduce that the carb was, at least, providing some fuel?….many thanks 👍
Thank you, so much for your tutorials. I find them very helpful. This carburettor is similar to mine. I have just replaced the disintegrated fuel lines and grommet after the machine being rested up for a couple of years. I put in the ready mixed styhl fuel in it. I cannot undo the spark plug as it is too tight. I am experiencing bog down and the machine dying on me when it gets warm always needing to run on choke. There is a little smoking from the exhaust, but better than it was. I am continuing to play around with the screws to see if it helps, but if you can think of anything else please,let me know.... I have watched your video on always needing choke. This particular machine is a Timberpro earth auger. Next machine for me to start is my styhl chainsaw after two years rest 😬🥴. all the best, Julia
This carb is very similar to a lawnmower type engine. So far I haven't seen a carb on any two strokes like it. In respect the primer bulb is doubling as a fuel bowl on a four stroke engine. Trying to remember if my stihl tree pruner has this type of carb. Hmmm,, thanks for another great video.
Souldrinker There are many carbs with the primer attached to the carb, but a single fuel -air mixture screw and barrel style throttle closure is different. But as u say they're out there, I think my stihl pruner has a similar carb. Only a single adjustment screw. much more simple to adjust.
Peter Ford Yeah I don't know why my strimmer has this type of carb, with the single screw and barrel throttle instead of a butterfly valve. Is there any reason they aren't more common? I've noticed they're ever so slightly bigger than the more traditional option, but other than that...
Souldrinker That's cool. The new design seems like just new and improved. Happy for u, u have one. Bet it's so much easier to adjust. Not that u need to very often. Take care.
This was outstanding , Must of taken a wealth of time for you` a big thank you from me for your efforts, Question, What should the main jet screw be set at in the Ventura, I taken it out to clean but for got to count the turns,
Wonderfully explainned....thank you so much for this hard work. Your video was so interesting tht watched all... Bcz of your video i am able to repair my carburetor for GX 31 engine. TC Boss
Such an informative video, many thanks. However I've just been asked to look at one of these and I have a problem. The throttle barrel doesn't seem to want to return fully to the adjuster screw and its not the cable. Do the springs lose their tension? I wondered if I could rotate the spring to give it more torsional power? Also should the barrel rotate enough to completely shut off air flow or leave just a minute gap to allow tickover?
@@TheRepairSpecialist Yes sir, thank you for taking the time to put these in depth videos together. I am trying to advance in my small engine knowledge and create a business. I have been dabbling in it for the last 4 years and have been studying and getting my theory together these last few weeks. You have given me a great deal of clarity with your video!!!
2- storke Carburator explained by V- for Vendeta ,,first fourteen minutes I undestood nothing,all I know is the return line looks like Erectile disfuntion
HEy Craig, i see that this video is 5 years old but you responded to a commentor 3 months ago. I have been looking high and low for that carburetor (bottom primer bulb. you show 2 cycle. COupld you tell me the make of that thing.BY the way, this is for a cheap chinese post hole auger. Thanks.
Sat and watched 48.5 mins. video on the working of a Carburetor which I found very informative, unfortunately I was looking for an answer to a question why my hedge trimmer runs O.K. whilst it is sitting flat but cuts out if you try to raise the cutting blades up. anyone with any ideas ?
when press the priming its send air to fuel tank and priming start vacuum but upper side of diaphrame has main jet nozzle and its ope directly to the athmosphere so why vacuum not broken while priming on upper side of diaphrame?
I know what you mean by asking this. I should make a video on it to explain better. I have taken main jets apart in the past and have found that most of them have very small one way valves. They will let pressure out into the venturi but not allow suction back in. I failed to mention this so you rightly questioned it. Thanks. Craig
At 3:43 it shows the yellow needle going into the main jet/venturi. There is a screw at the top that allows this needle to move up/down. Some have suggested that this should be checked as part of a carb tune-up along with the throttle speed screw and air/fuel screw. Any thoughts on this? Is this really a high-speed idle adjustment?
That screw is part of the needle, it is one solid metal piece not individual parts. It serves to fasten the needle into place, it is not really an adjuster, however there is a washer in there that I suspect if removed, would mean the needle would screw in slightly slightly further possible making low idle cut out however high speed RPM's would still work.
Hi I have a 2 stoke engine for my boat The one with the red top I no the pully is going but on top of that when I the water and I just start it when I leave it on a small speed it's ok but if I push it to full speed it will make a nize from the shaft and a few seconds later it will cut out ,what's the problem do you no? Is it got to do with this carb?
Question: how come when you disconnect a fuel line from the carb, with fuel in the tank and the tank's cap on, fuel spills out of the disconnected fuel line? is it because the fuel tank is above atmospheric pressure?
Yeah, I think it's the effect of the evaporative properties of petrol. Like when you open a jerry can it hisses (much more in hot weather). Inside the tank any air space is full of Petrol vapour, this expands from heat and agitation, leading to a pressurisation of the liquid petrol and thus the fuel line.
Excellent explanation. However, "Crash Course" is not an accurate description. This is verbose, detailed, and borderline repetitive. And 45 minutes long. Exceeds "Crash Course" considerably. Thanks for doing a good job sharing your knowledge.
![[TH] 2024 PMGC League | Survival Stage วันที่ 1 | PUBG MOBILE Global Championship](http://i.ytimg.com/vi/FVFT-PFwU80/mqdefault.jpg)
I thought that I was watching high class technical university explanation lesson.Astonishing video. Very professional.
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
@@TheRepairSpecialist please keep making these videos! I learn so much from your videos, wonderful channel. Cheers.
Been working on a Walbro carb today on a strimmer and this tutorial has helped immensely with the workings of one .Thanks for taking the time to explain everything ,my head didn't hurt at all watching the video.
Thank you for your awesome comment. I really do appreciate it. Craig 👍
Your videos are exceptional. If there are awards for You Tube videos, you certainly deserve the highest awards given. Better than college classes.
Hi sir
I have never found such a way to explain. You are genuinely an expert teacher.
Hello! 🌟 Thank you ever so much for your kind words! I'm thrilled that you found my explanation helpful and that it resonated with you. Teaching and sharing knowledge is a true passion, and it's wonderful to know that I could assist you effectively. If you have any more questions or need further guidance in the future, please feel free to reach out. Keep the curiosity alive, and happy learning! Craig
Outstanding! You can always tell a persons deep understanding by their ability to explain something in a simple manner.
Leny Freeman, wow, that is what I call good feedback. Thank you 😊 so much. I really do appreciate it
1:25 X-Ray Vision, my favorite part :-D - the best animation and drawing work right there. Kudos to You Mr. Repair Specialist!
You are hands down the very best at explaining carburetor function. Nobody does it better and I have tried. lol. Thank You
ulitepilot aka Zombie Dave, thank you so much for kind feedback. I really do a appreciate it.
Thank you very much sir,your videos should be required course work in school. Having this instead of half-assed metal shop would have saved me so much time
Excellent, brilliant, really outstanding explanations and description for this carburetor. I would not have thought that it was so sophisticated. I can now work and repair the exact same unit that I own ! Great thanks !
Glad it helped. Thank you so much for the great feedback!
A lot of time and effort went into this video, thank you for sharing!
My pleasure!
I just picked up a free non-running 49cc sit-on scooter and have no knowledge about two-cycle carburetors. I've removed all components from this scooter to overhaul everything. This video is insanely helpful for me, thank you!
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
Wonderfully done tutorials - I finally feel that I understand how these little carburetors work.
There's one thing I didn't see in them - some of these carbs seem to have a little one- way valve (not a reed type consisting a flap of plastic sheet) situated between the gas chamber immediately under the main diaphragm and the point from which gas then gets to the carburetor's throat. There are often three separate lines leading from that point to those holes spaced along the throat - one or two of which may have flow adjusting needles.
That valve is especially troublesome because it's in a blind hole and can't readily accessed. One thing that seems to get them working again is to forcefully inject hot soapy water into them with a Water PIC. That's also the best way I've discovered to blast particles/crud etc. out of any of the other holes & lines. It's more forceful than is compressed air and has the additional advantage of being visible - water squirted into a orifice should come out somewhere.
Anyway, I've got a question: Most of these little engines seem to have "corrected" compression ratios", (total volume above the piston's exhaust port /combustion chamber volume) of about 7:1. Consequently, it seems unreasonable that one should expect to see cold cranking (with the pull cord) compression test results as high as the experts often recommend; e.g.," >150 psi". Because the heat capacity of the gauge is far greater than that of the air being pumped into it, it seems that the highest absolute pressure reading that any such engine could generate under such conditions would its "corrected compression ratio" times local atmospheric pressure; i.e., at sea level, 103 psi ( 0.7 MPa). Is that reasonable?
Very very clean explanation! Doesn’t get any better than this 👍🏻
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
Brilliant explanations and visual guides, jives with my style of learning perfectly, many many thanks.
Impressive tutorial ! Incredible that someone took the time and effort to make a so well crafted tutorial on something like this, a small carburetor. So good that hundreds enjoyed it!
¡gracias por compartir!
Thank you so much for your nice feedback and I’m really pleased you like my video. Thank you. Craig 👍👍
Hi
I wanted to include this video because many of my viewers have mentioned to me that the carburetors i have shown in the past look quite different to their carburetors form their Strimmers and Chainsaws. This particular one in this video is such a Carburetor, which is indeed quite different in structure and function to the conventional two stroke cycle carburetor. This one also has a primer bulb system fitted and both the metering system and the fuel pump system are on the same side of the carb.
This is quite different indeed to the more common type of two stroke carburettor.
I hope this is of benefit to you.
Thanks Craig
Ty bud
TheRepairSpecialist thank you so much, for making this video :)
Thanks for making these videos. They're great to watch, helped me fix and tune my whipper snipper
@TheRepairSpecialist - Bula vinaka from the islands of Fiji. A very well and detailed explanation. Hats off to your hard work and preparation for this video.
Enhorabuena ¡muchas gracias por la master class.
Thank you I really appreciate it
Bravo, enfin une explication complete , claire et super bien faite . Merci merci MERCI.
Very well done sir i have three scooters a 150 cc and a 250 cc i'm working on now i got a better understanding of what i'm doing now on the scooters that mixes the oil do you have any videos on that.
Very good explanation sir. I never see any one explain like this . Thank you very much for your great tutorial
That was fascinating and brilliantly explained….two questions though…..1. Would I be right in assuming that you cannot then over-prime by pressing the bulb too many times - simply because the engine is not yet running?….2. Is it possible to test the carb by, firstly removing the spark plug, holding open the throttle to release the jet seating and pressing the primer bulb in order to force fuel up into the Venturi? ie would I be able to see file spray and so deduce that the carb was, at least, providing some fuel?….many thanks 👍
Fantastic video really helps me understand the carb I've fitted on my strimmer thank you.
Thank you, so much for your tutorials. I find them very helpful. This carburettor is similar to mine. I have just replaced the disintegrated fuel lines and grommet after the machine being rested up for a couple of years. I put in the ready mixed styhl fuel in it. I cannot undo the spark plug as it is too tight. I am experiencing bog down and the machine dying on me when it gets warm always needing to run on choke. There is a little smoking from the exhaust, but better than it was. I am continuing to play around with the screws to see if it helps, but if you can think of anything else please,let me know.... I have watched your video on always needing choke. This particular machine is a Timberpro earth auger. Next machine for me to start is my styhl chainsaw after two years rest 😬🥴. all the best, Julia
nice explanation and clarification 👍
long but very thorough and well worth a listen!
Very very neat and clean explanation, and ur efforts, u r the best professor also ha aha keep going sir, from india
Very nice video. It took a lot of engineering to figuring all this out when they designed it. Thanks for asking it.
Your one heck of an instructor.
Superb production, thanks so much for such incredible attention to detail.
Amazing and ingenious design and brilliantly explained
Aha, Matt, fancy seeing you here! Yes this is a brilliant tutorial..and the overhaul that I've done on a similar carb makes much more sense now!
This man is a straight legend
This carb is very similar to a lawnmower type engine. So far I haven't seen a carb on any two strokes like it.
In respect the primer bulb is doubling as a fuel bowl on a four stroke engine. Trying to remember if my stihl tree pruner has this type of carb. Hmmm,, thanks for another great video.
My 2 stroke strimmer has a carb exactly like this.
Souldrinker There are many carbs with the primer attached to the carb, but a single fuel -air mixture screw and barrel style throttle closure is different. But as u say they're out there, I think my stihl pruner has a similar carb. Only a single adjustment screw. much more simple to adjust.
Peter Ford Yeah I don't know why my strimmer has this type of carb, with the single screw and barrel throttle instead of a butterfly valve. Is there any reason they aren't more common? I've noticed they're ever so slightly bigger than the more traditional option, but other than that...
Souldrinker That's cool. The new design seems like just new and improved. Happy for u, u have one. Bet it's so much easier to adjust. Not that u need to very often. Take care.
How can anybody put any down votes on some one that uses his time to try and help people to understand things.
This was outstanding , Must of taken a wealth of time for you` a big thank you from me for your efforts,
Question, What should the main jet screw be set at in the Ventura, I taken it out to clean but for got to count the turns,
Wonderfully explainned....thank you so much for this hard work. Your video was so interesting tht watched all... Bcz of your video i am able to repair my carburetor for GX 31 engine. TC Boss
Thanks God for your very clear tutorial.God may bless you more.
THE BEST explanation EVER!!!! THANK YOU!
Im so glad you found it useful thank you so much for your kind comment :D
-Craig
This video was worth the effort. Godd job sir and thank you
Thanks, love your teachings!
Very nice n illustrated indeed. Thanks a lot.
Harvard Uni misses you in their Mechanical department.
Thank you! Very well done. I was able to get mine going with your help.
Very well done!!!
Really good video, now have a much better understanding. Thanks.
Im gald this could help you, Thank you so much for your nice feedback :D
-Craig
Such an informative video, many thanks. However I've just been asked to look at one of these and I have a problem.
The throttle barrel doesn't seem to want to return fully to the adjuster screw and its not the cable. Do the springs lose their tension? I wondered if I could rotate the spring to give it more torsional power? Also should the barrel rotate enough to completely shut off air flow or leave just a minute gap to allow tickover?
Very explanatory, thank you Sir!
Thank you so much for the nice feedback. I really appreciate it. Craig
Excellent video !!! Congratulations
Thank you so much for the nice feedback. I really appreciate it. Craig
Awesome video sir!!!!!
Thank you so much for the nice feedback. I really appreciate it. Craig
@@TheRepairSpecialist Yes sir, thank you for taking the time to put these in depth videos together. I am trying to advance in my small engine knowledge and create a business. I have been dabbling in it for the last 4 years and have been studying and getting my theory together these last few weeks. You have given me a great deal of clarity with your video!!!
2- storke Carburator explained by V- for Vendeta ,,first fourteen minutes I undestood nothing,all I know is the return line looks like Erectile disfuntion
Thank you for explane 👍👍👍
HEy Craig, i see that this video is 5 years old but you responded to a commentor 3 months ago. I have been looking high and low for that carburetor (bottom primer bulb. you show 2 cycle. COupld you tell me the make of that thing.BY the way, this is for a cheap chinese post hole auger. Thanks.
Sat and watched 48.5 mins. video on the working of a Carburetor which I found very informative, unfortunately I was looking for an answer to a question why my hedge trimmer runs O.K. whilst it is sitting flat but cuts out if you try to raise the cutting blades up. anyone with any ideas ?
So the high side screw if you screw it all the way in how many turns should you screw it out to get the engine running ?
Great video. Thx.
Just to know on how to clean this carburettor in case the engine starts and stops automatically after few seconds
Explained very clearly thak you
Thank you very very educative
Good explanation sir
Thank you so much for the nice feedback. I really appreciate it. Craig
Well done!! Thank you!!
watcher Rube
Great video
Thanks a lot!
Thanks God very well explain.
Great Video, its very knowledgeable Thanks.
Great, So many thank for your explaination.
when press the priming its send air to fuel tank and priming start vacuum but upper side of diaphrame has main jet nozzle and its ope directly to the athmosphere so why vacuum not broken while priming on upper side of diaphrame?
I know what you mean by asking this. I should make a video on it to explain better. I have taken main jets apart in the past and have found that most of them have very small one way valves. They will let pressure out into the venturi but not allow suction back in. I failed to mention this so you rightly questioned it. Thanks. Craig
@@TheRepairSpecialist you are Best at 2t motors but i don't have experiances enough on it. so some times i don't understand it well.
I have this type carburettor but without a primer bulb, will it function the same during runtime? It came off of a titan ttk587gdo brush cutter
At 3:43 it shows the yellow needle going into the main jet/venturi. There is a screw at the top that allows this needle to move up/down. Some have suggested that this should be checked as part of a carb tune-up along with the throttle speed screw and air/fuel screw. Any thoughts on this? Is this really a high-speed idle adjustment?
That screw is part of the needle, it is one solid metal piece not individual parts. It serves to fasten the needle into place, it is not really an adjuster, however there is a washer in there that I suspect if removed, would mean the needle would screw in slightly slightly further possible making low idle cut out however high speed RPM's would still work.
Hi I have a 2 stoke engine for my boat The one with the red top I no the pully is going but on top of that when I the water and I just start it when I leave it on a small speed it's ok but if I push it to full speed it will make a nize from the shaft and a few seconds later it will cut out ,what's the problem do you no? Is it got to do with this carb?
Question: how come when you disconnect a fuel line from the carb, with fuel in the tank and the tank's cap on, fuel spills out of the disconnected fuel line? is it because the fuel tank is above atmospheric pressure?
Yeah, I think it's the effect of the evaporative properties of petrol. Like when you open a jerry can it hisses (much more in hot weather). Inside the tank any air space is full of Petrol vapour, this expands from heat and agitation, leading to a pressurisation of the liquid petrol and thus the fuel line.
Just thought of a good analogy, imagine the tank was fuel of coke, with all the shaking etc..!
primer bulb was the worst idea for these small carburetors, would have been far better to put a little air pump bulb on the fuel tank.
What a problem of excessive heat of engene an working?
Sorry but i don't understand what you are asking. Can you write it again and i will answer. Thanks. Craig
Excellent explanation. However, "Crash Course" is not an accurate description. This is verbose, detailed, and borderline repetitive. And 45 minutes long. Exceeds "Crash Course" considerably. Thanks for doing a good job sharing your knowledge.
@Whoop!!!
in spanish plis
in spanish pls....
Ferg
All Episodes -for 2-Stroke Carburetors Here. Thanks. Craig:
th-cam.com/play/PLrlXp3PlwgRI5OLvm3P91LJr1CYnO5TRD.html
Hindi mein banao video
Φίλε μου συγχαρητήρια πολύ πολύ Καλή επεξήγηση συγχαρητήρια