Helped me solve my idle problem on my ATV. Been stumped forever. SEEING WHAT SHOULD BE HAPPENING helped my understand what was NOT HAPPENING. The second the choke was closed the ATV would "sneeze" and stall. I cleaned the idle circuit and nothing changed. I started by opening the pilot air screw in quarter turn increments until I was a additional 1.25 turns out from the starting point of 2. This is the first time it has idled right since I bought it used a few years back. Big thanks...seeing the concept of operations helped me understand what I was seeing and hearing and zero in on the cause. YOU THE MAN!
What a perfect animation of how that carb works. Slowing playback to .5 makes it much easier to understand. Now I know why my Honda Recon needs the choke pulled 3/4 out to run great for years. Adjust pilot mixture screw or pilot circuit is partially plugged. Great job, Thanks so much, Subscribed.
Hello, I have this kind of Mikuni on my '91 dr250. I've been having a hard time tuning it. I have a steady idle and with a light flick of the throttle it seems to react well. When I give throttle above 3000 it goes up quickly above and then stays at 4000 for 15-30 seconds. When accelerating I don't get much power at wide open.
Απ όλα τα βίντεο για τη λειτουργία των καρμπυρατέρ που έχω δει -και είναι πολλά - το βίντεο σου εξηγεί με τρόπο εξαιρετικό το κάθε τι. Προσωπικά με μόρφωσες περαν κάθε αμφιβολίας κι ερωτηματικού. Είσαι καθηγητής! Μπράβο για τον κόπο και τον χρόνο που αφιέρωσες για να κάνεις εύκολη τη ζωή πολλών ημιμαθών στο χώρο.. Ευχαριστώ πολύ!
I've always been able to picture it in my head but this is by far one of the best animations I've ever seen. This is why shimming the main jet seat can increase/richen up afrs in the rpms sooner
When I worked at a bike shop one summer, the mechanics would hook up IV bottles of gas to the carbs. Some bikes had 1, 2, or 4 carbs. They would point the exhaust out the door, and rev the holy beans out of them while doing all the carb adjustments to get the idle, off idle, deceleration, full throttle settings all working in harmony. Your ears play as much of a role as the screwdriver during adjustments. Earplugs a good idea.
I've watched more than 100 videos about the working of carburettor.. but this video explained everything without even a single word. now I've understood the working of carburettor and I'll adjust my bike s air screw for best mileage.
Awesome simply awesome explanation. Cleared up the fog in my head as to how this type Of carb works and the sequence with which components work together. Thank-you
Hi, I just wanted to point out that not all CV carbs have this same throttle vacuum passage that routes through the top cap. If you don't have that extra air tube running thru the top cap (not decelleration enrichment circuit), then you probably have a cylinder shaped slide with a hole in the bottom. High velocity air past that hole causes a vacuum to form above the diamphram and when it builds up it will overpower the spring and the slide will lift up. When you close the throttle the air velocity under the slide slows down, the vacuum above the diaphram reduces and the spring lowers the slide back down.
Thnx to you. Many people though that, when the slide valve opening, the pilot jet and main jet will supply gas together. This is wrong because I have also study with the video from suzuki it self. Thnx to you bro. Kepit up
It finally clicked. The butterfly valve works like an air plane wing. The carb then needs non turbulent air flow in order to not run like shit in a slight breeze. Thank you for the animation.
One of the best video in RUclips regarding Carburator.Excellent video.Please upload cooling system with thermostat in a Vehicle and more and more..Thanks.
Superb job. It should also show the filters that let air in/out of the carb chamber above the fuel and under the rubber diaphragm. If the foam in these filters deteriorates to particles, then the particles ca get into the carb chamber and cause all kinds of trouble.
a friend of mine has a scooter lml 150. It's running pretty rough. The other day the exhaust went pop and it cut out while riding in second gear when the choke was pushed in (not sure if you should push the choke in mid scoot, i tend to wait for the lights). She started again and although warmed up would only run without the choke pulled out.. She's also slow to react to the throttle. We were thinking dirty fuel, but looking at this i think it could be blocked pipe in the carb. Sorry i know nothing about engines, but i'm interested to figure this one out. I've got the LML 125 and she's running sweet. great diagram, i've replayed it about 10 times and i'm just getting my head around it. You have to watch one piece at a time.. Super informative! well done Athanasio. thanks..
I just saw this now, let me say thank you very nice explanation. Im doing some carburetor work for the first time, the one thing that took some time to understand is when the throttle is open there is no linkage to the slide its just vacuum that pulls it open?
Great explanation, however the diagram never showed the 2-3 additional transition jet holes situated behind the throttle butterfly(idle position) that flows from the pilot circuit, to supply the engine with extra fuel before the mainjet kicks in, also this particular carberator style, does not cover an accelerator pump circuit.
Hey thanks for the reply.. I did actually figure it out yesterday and ur exactly right.. I had to drill out the cap and adjust the fuel mixture screw .. Now it runs perfect!
That's fantastic.. Do you have the sound effects of a lean and or rich setting ..that way I know which way to adjust my settings ..to make it better ..
Excellent explanation and animation but notice of carb working ranges: from 0 to 1/4 throttle (jet pilot), from 1/4 to 3/4 throttle (needle jet and jet needle), 3/4-full throttle (main jet) and throttle valve cutaway is missing.
just suggestion..make video focus to ratio oil and air..how to set main jet and pilot jet,.thats too many questions actually in my head but i cant explain to you bcoz i dont know much english.. sorry about my english..thanks and you're very kind.;D
Awesome demo. Only thing it misses is the four tiny holes at the base of the butterfly throttle valve. Can you add that? Also, the air exchange passage for the diaphragm is missing and the choke / enricher passage is a little different on most carbs. Stil, an awesome effort! This fine points show how complex the carb is.
I don't like CV carbs very much. Everything has to be perfect with the diaphragm and the throttle slide for it to lift perfectly. If there is any sticking on the way up the engine will stutter & there'll be a flat spot (usually IMO between 3000 and 4000 revs), if there;s sticking on the way down, the revs will stay high (until you load the engine). Aftermarket diaphragms seem not to be the same rubber material as the original and maybe don't work too well. Didn't have this hassle with the Dellorto pumpers on my old Guzzi, they just worked!
Have cv on my ktm 950. And notice a flat spot, thanks for explaining how this comes. Also i find gas response is not so quick, engine not so aggressive as I want. Or as aggressive as an 990 injection. A way to make cv carb more aggressive?
My idea was jut to use a pipe T joint with a pipe going into a fuel tank. In the pipe to the T Joint is a piece of carbon felt wick. This wicks fuel up to the pipe T joint where air flows around or though the wick to make a fuel air mix. You can even use a small canister with a gas line and a return with a slow flow fuel pump of 30ml a minute. As long as most of the fuel returns to the tank and the wick is soaked in fuel. and you can have a fixed fuel level for the canister for the wick system. A spark arrestor and air filter are used on the top of the pipe T for the intake a small air filter and the output runs through a spark arrestor.
Very nice. Thanks. I would love to watch it in slow motion as I'm only able to read and process new information at a certain rate. Perhaps I'm the only one but I'm new to understanding carbs. Thanks again.
as i renember correctly ... the "pilot mixture screw" adjust: on 4t the amount of fuel drawn from float bowl, on 2t the amount of air added to mixture. On this animation it doesnt regulate any of those two. It should be placed just after "Pilot jet" or "Pilot air jet" (didnt even know that we have "pilot air jet") to control one of those.
The pilot screw regulates either the amount of air or the amount of fuel depending on the model of the carburetor which is identified by it's position on the carburetor body. On models such as mikuni bdst it regulates the amount of mixture because the air & fuel amounts are pre-regulated by the pilot air jet and pilot fuel jet. Also it doesn't matter at all on what kind of engine it is applied on, 2t or 4t. Hope this helps
thanks a lot dude..very helpful.my carburetor have a problem, when i start ,i see white smoke out from exhaust and smell like a petrol, maybe.. .please try to solve..
i dont remember actually,either white or blue.. this problem just happen after i install a component ..today when i start the engine, smoke still have and i try to setup air screw ..its work after 5 minute..disappear .thanks a lot dude for helping..;D
Helped me solve my idle problem on my ATV. Been stumped forever. SEEING WHAT SHOULD BE HAPPENING helped my understand what was NOT HAPPENING. The second the choke was closed the ATV would "sneeze" and stall. I cleaned the idle circuit and nothing changed. I started by opening the pilot air screw in quarter turn increments until I was a additional 1.25 turns out from the starting point of 2. This is the first time it has idled right since I bought it used a few years back. Big thanks...seeing the concept of operations helped me understand what I was seeing and hearing and zero in on the cause. YOU THE MAN!
What a perfect animation of how that carb works. Slowing playback to .5 makes it much easier to understand. Now I know why my Honda Recon needs the choke pulled 3/4 out to run great for years. Adjust pilot mixture screw or pilot circuit is partially plugged. Great job, Thanks so much, Subscribed.
Best Carburetor explanation on the youtube ever ,thank you very much...
Aravinthan Mahalingam
طيور لجنا
Hello, I have this kind of Mikuni on my '91 dr250. I've been having a hard time tuning it. I have a steady idle and with a light flick of the throttle it seems to react well. When I give throttle above 3000 it goes up quickly above and then stays at 4000 for 15-30 seconds. When accelerating I don't get much power at wide open.
is the adjustment screw for air or fuel?
You made completely clear how a CV carburetor works with this excellent animation. Thank you.
Απ όλα τα βίντεο για τη λειτουργία των καρμπυρατέρ που έχω δει -και είναι πολλά - το βίντεο σου εξηγεί με τρόπο εξαιρετικό το κάθε τι.
Προσωπικά με μόρφωσες περαν κάθε αμφιβολίας κι ερωτηματικού.
Είσαι καθηγητής!
Μπράβο για τον κόπο και τον χρόνο που αφιέρωσες για να κάνεις εύκολη τη ζωή πολλών ημιμαθών στο χώρο..
Ευχαριστώ πολύ!
I've always been able to picture it in my head but this is by far one of the best animations I've ever seen. This is why shimming the main jet seat can increase/richen up afrs in the rpms sooner
When I worked at a bike shop one summer, the mechanics would hook up IV bottles of gas to the carbs. Some bikes had 1, 2, or 4 carbs. They would point the exhaust out the door, and rev the holy beans out of them while doing all the carb adjustments to get the idle, off idle, deceleration, full throttle settings all working in harmony. Your ears play as much of a role as the screwdriver during adjustments. Earplugs a good idea.
Great...
This is the best animation in RUclips to explain the carburater working.
Thankyou ..
The power of the internet. Thanks for putting in the work and sharing.
I've watched more than 100 videos about the working of carburettor.. but this video explained everything without even a single word. now I've understood the working of carburettor and I'll adjust my bike s air screw for best mileage.
Animation with actual engine sound makes it easier to understand. Thank you for the knowledge shared.
You cannot imagine how helpful this was.
This is literally class worthy..I like how you did this..if I was a professor you’d have an A+ lol
Simplest explanation ever. Good that you put sound in, it helps a lot.
Now i see why this has so many views. It's brilliantly explained!
the animation and the audio were done so well, thank you
Awesome simply awesome explanation. Cleared up the fog in my head as to how this type
Of carb works and the sequence with which components work together. Thank-you
Hi, I just wanted to point out that not all CV carbs have this same throttle vacuum passage that routes through the top cap. If you don't have that extra air tube running thru the top cap (not decelleration enrichment circuit), then you probably have a cylinder shaped slide with a hole in the bottom. High velocity air past that hole causes a vacuum to form above the diamphram and when it builds up it will overpower the spring and the slide will lift up.
When you close the throttle the air velocity under the slide slows down, the vacuum above the diaphram reduces and the spring lowers the slide back down.
This video is excellent. I've rebuilt about 100 CV carbs.
Finally....an explanation of how these carburators work. Thank you! Now I can properly diagnosis my quads' issue.
That was amazing! Well done. I am often-times floored by the creativity and enterprise of some of you RUclips posters!
No comments.. Perfect.... Thank you. Best explanation ever...
What a good video! Thanks so much for taking sommuch effort explaining this
Nice video, makes things allot easier to understand when cleaning tuning and understanding this carb!
THANK YOU VERY MUCH FOR THIS. TRULY A INCREDIBLE AMOUNT OF HELP.
Thnx to you. Many people though that, when the slide valve opening, the pilot jet and main jet will supply gas together. This is wrong because I have also study with the video from suzuki it self. Thnx to you bro. Kepit up
Helped me understand the Keihin CVK36s on my ZRX. I had a clue, but this summed it up for me. Thanks for uploading
It finally clicked. The butterfly valve works like an air plane wing. The carb then needs non turbulent air flow in order to not run like shit in a slight breeze. Thank you for the animation.
Your concept is short and clear❤️
One of the best video in RUclips regarding Carburator.Excellent video.Please upload cooling system with thermostat in a Vehicle and more and more..Thanks.
Superb job. It should also show the filters that let air in/out of the carb chamber above the fuel and under the rubber diaphragm. If the foam in these filters deteriorates to particles, then the particles ca get into the carb chamber and cause all kinds of trouble.
Great video. Idk why but the engine starting sound scared me 😂😂
!!!THANK YOU SO MUCH!!! I'm in school and I could understand no mater how many pictures I saw this helped me out a lot
Mate, this is a really good vid. So glad that dudes like you take the time to post this sort of stuff.
Amazing video! Well made, easy to understand! Thank you!
The best explanation of how a carburetor works
Thank you for making this video. I now know how my carburetor work's
This is for sure a pretty cool little video on how a carb works! Good job!
this is th ebest video I have ever seen on youtube. thankyou. a picture speaks a million words
Helped me much to cure my Keihin Carb of my Honda Rebel. Thanks for this great Animation
Best way to learn how it works and way better then any other video:-)
simple effective explanation thanks
Best explanatory video I have seen! Similar to UCAL BS26 Carb on pulsar
having problems with my rebuild so decided to watch this and learn how they work to troubleshoot
Gran bel video.scusi ho un carburatore keihin cvr montato su un motore Abarth. Qualche dritta per una carburazione base.grazie
Excellent, explication parfaite, représentation très réaliste...Bravo !!!
a friend of mine has a scooter lml 150. It's running pretty rough. The other day the exhaust went pop and it cut out while riding in second gear when the choke was pushed in (not sure if you should push the choke in mid scoot, i tend to wait for the lights). She started again and although warmed up would only run without the choke pulled out.. She's also slow to react to the throttle. We were thinking dirty fuel, but looking at this i think it could be blocked pipe in the carb. Sorry i know nothing about engines, but i'm interested to figure this one out. I've got the LML 125 and she's running sweet. great diagram, i've replayed it about 10 times and i'm just getting my head around it. You have to watch one piece at a time.. Super informative! well done Athanasio. thanks..
+Ronan Dowling *** sorry went pop and cut out 'as' the choke was pushed in.
Perfect animation!
Thanks
Need help with a set of Triumph bonneville 2001 Carbuators. They have been cleaned a couple Of times but they only work while the choke is on.
很好
Excellent! Very well laid out...to include associating the audio cues with the visuals.
Thanks for the hearth attack when engine started
Alex Naoumov I'm sorry about that man!
Haha no problem. Great video!
@@athanasiodol where would the idle adjustment screw fit into this animation? well done.
I just saw this now, let me say thank you very nice explanation. Im doing some carburetor work for the first time, the one thing that took some time to understand is when the throttle is open there is no linkage to the slide its just vacuum that pulls it open?
It's light the heavens opened and a light shined down! Thanks!!!
Great explanation, however the diagram never showed the 2-3 additional transition jet holes situated behind the throttle butterfly(idle position) that flows from the pilot circuit, to supply the engine with extra fuel before the mainjet kicks in, also this particular carberator style, does not cover an accelerator pump circuit.
Simply and perfect. Thanks.
Hey thanks for the reply.. I did actually figure it out yesterday and ur exactly right.. I had to drill out the cap and adjust the fuel mixture screw .. Now it runs perfect!
That's fantastic..
Do you have the sound effects of a lean and or rich setting ..that way I know which way to adjust my settings ..to make it better ..
Excellent explanation and animation but notice of carb working ranges: from 0 to 1/4 throttle (jet pilot), from 1/4 to 3/4 throttle (needle jet and jet needle), 3/4-full throttle (main jet) and throttle valve cutaway is missing.
Thank you. 2min vid explained better then 10 pages of a book.
Really good job in a concise video.....keep up the good work bro.
just suggestion..make video focus to ratio oil and air..how to set main jet and pilot jet,.thats too many questions actually in my head but i cant explain to you bcoz i dont know much english.. sorry about my english..thanks and you're very kind.;D
Very well illustrated video. Thanks
that yellow thing, is emulsion tube, it has holes, which control fuel quantity that mix with air..
You gave us democracy.. and now this video! too much.. it's awesome!! thank you!!!
Awesome demo. Only thing it misses is the four tiny holes at the base of the butterfly throttle valve. Can you add that? Also, the air exchange passage for the diaphragm is missing and the choke / enricher passage is a little different on most carbs. Stil, an awesome effort! This fine points show how complex the carb is.
Stellar explanation.
To see the systems of the carburetor work in animation was awesome, do it again with something else please
Well Done there should be more teaching aids like this
I'd like to see the same thing but with a any 4 barrel carb
I am not even sure you still read comments
But thanks for explanation ❤
I don't like CV carbs very much. Everything has to be perfect with the diaphragm and the throttle slide for it to lift perfectly. If there is any sticking on the way up the engine will stutter & there'll be a flat spot (usually IMO between 3000 and 4000 revs), if there;s sticking on the way down, the revs will stay high (until you load the engine). Aftermarket diaphragms seem not to be the same rubber material as the original and maybe don't work too well. Didn't have this hassle with the Dellorto pumpers on my old Guzzi, they just worked!
Have cv on my ktm 950. And notice a flat spot, thanks for explaining how this comes. Also i find gas response is not so quick, engine not so aggressive as I want. Or as aggressive as an 990 injection. A way to make cv carb more aggressive?
Nice video. How about coasting enricher system on CV carburators?
Was hast du dir für eine Arbeit gemacht?! Wahnsinn 👍🏼👍🏼👍🏼
amazing explanation. Thank you
It's pretty damn good I'm rebuilding keihlin s3a carbs on a 70 sl350 honda.
My idea was jut to use a pipe T joint with a pipe going into a fuel tank. In the pipe to the T Joint is a piece of carbon felt wick. This wicks fuel up to the pipe T joint where air flows around or though the wick to make a fuel air mix. You can even use a small canister with a gas line and a return with a slow flow fuel pump of 30ml a minute. As long as most of the fuel returns to the tank and the wick is soaked in fuel. and you can have a fixed fuel level for the canister for the wick system. A spark arrestor and air filter are used on the top of the pipe T for the intake a small air filter and the output runs through a spark arrestor.
Great video! Now when I try to explain this to my customer again, I can just show him! :-D
Perfect explanation
how many hours of work are needed for that animation?
very good explanation.
Very nice. Thanks. I would love to watch it in slow motion as I'm only able to read and process new information at a certain rate. Perhaps I'm the only one but I'm new to understanding carbs. Thanks again.
you can always pause the video and rewatch. Carbs are complicated but the more they are studied the easier it gets.
I kept my mouse on the pause and made sure I got it before i continue.
So it uses vacuum to pull the throttle needle by the way what was the pros and cons for this type of carburetor?
When the butterfly valve opens and the diaphragm valve open, wouldn't all of the air rushing in go back into the diaphragm valve and close it again?
So... the pilot jet stop working on max RPM?? I have that question
They both work together at high rpm
Very good. Thank you. I now understand.
as i renember correctly ... the "pilot mixture screw" adjust: on 4t the amount of fuel drawn from float bowl, on 2t the amount of air added to mixture. On this animation it doesnt regulate any of those two. It should be placed just after "Pilot jet" or "Pilot air jet" (didnt even know that we have "pilot air jet") to control one of those.
The pilot screw regulates either the amount of air or the amount of fuel depending on the model of the carburetor which is identified by it's position on the carburetor body. On models such as mikuni bdst it regulates the amount of mixture because the air & fuel amounts are pre-regulated by the pilot air jet and pilot fuel jet. Also it doesn't matter at all on what kind of engine it is applied on, 2t or 4t. Hope this helps
top notch presentation.
Thats really helpful, thanks for sharing
thanks a lot dude..very helpful.my carburetor have a problem, when i start ,i see white smoke out from exhaust and smell like a petrol, maybe.. .please try to solve..
thank you. this is amazing. very helpful.
Great video, very helpful as well. Thank you very much.
Thanks for this simple animation! I think I finally understand my carb now!
Very informative and helpful, thanks.
My Honda CB 500 has two CVK's , always reliable
Very nice explanation!
Finally I am starting to understand.
Can you do a video on how to modefy a CV carburettor to blow through carburettor?
Or maybe how a blow through carburettor works please?
i dont remember actually,either white or blue.. this problem just happen after i install a component ..today when i start the engine, smoke still have and i try to setup air screw ..its work after 5 minute..disappear .thanks a lot dude for helping..;D
So pilot jet and needle jet have different hole size so different amount if fuel can be given
Great visual reference, thanks for sharing
Exactly what I've been looking for!
great video, tks a lot!! My cv carburetor has a big hole near to pilot air jet and through to throttle valve dia phragm, what is it for?