How a carburetor works, schemes and explanations

[divyankumaran]

very good explanation...:-) 

[CompagniaDellaRuota]

This vid made my day

[arctor08]

@CompagniaDellaRuota forse eri sarcastico, ma mi fa piacere vedere che anche qualche connazionale abbia visto questo video!

[CompagniaDellaRuota]

@arctor08 No non ero sarcastico, anzi! Da tempo cercavo un video che mi spiegasse chiaramente e in poche parole il funzionamento di un carburatore!! Ero sincero, giuro. Tra l'altro non sapevo fossi italiano, grande!

[arctor08]

@CompagniaDellaRuota hahaha ma grazie mille!!

[Hooverdarnit]

How would a 150cc 4 stroke engine perform, if the auto choke vibrated completely off the carburetor? How would it affect the starting and how would it perform at higher rpm under load?

[arctor08]

@Hooverdarnit the auto choke keeps the carb partly closed when the engine is cold in order to richen the mixture at start. So if you don't have it anymore, it will be more difficult to start the engine and keep it at idle, especially with cold weather. At high rpm instead it won't affect the performance since the choke would be opened anyways, therefore not interfering with the air flow at all (or almost).

[Hooverdarnit]

@arctor08 Wow. That was not what I was hoping to hear. Here's why -- My auto choke vibrated completely off. However, the scooter started immediately and idled good. It accelerated nice but starts to misfire at higher rpms.

I thought, with the auto choke disconnected, the butterfly valve would be closed and stay closed because the auto choke wasn't connected to open it when warm and under full throttle.

While looking for the reason it misfires at high rpm, I found the loose auto choke.

[arctor08]

@Hooverdarnit Sorry I thought you meant that you had actually lost the choke valve. Which was a stupid assumption, as I don' think 150cc have a separate valve for the choke! Then I think that your automatic choke is not a real choke, meaning that it doesn't reduce airflow, but rather, it richens the mixture by increasing the amount of fuel aspirated. So if your connection to the autochoke is broken, it might have locked to "on", richening the mixture which would be the cause of misfiring.

[Hooverdarnit]

@arctor08 Thanks for your input. I recently replaced two broken valve springs. After putting them in, the scooter ran better than new, for about a day. Then it started misfiring at higher rpms.

I checked the valve gaps and saw they shifted somewhat. I reset the valve gaps tight, and right. But still the scooter misfired at higher speeds.

I saw two small bolts in a depression on top of the engine, then saw the auto choke (enricher) off the carburetor. You think I found the problem?

[arctor08]

@Hooverdarnit mmh.. maybe while rebuilding the carb after having replaced the springs, you may have misplaced some jets? There is a screw which regulates the fuel at low apertures. Perhaps you rescrewed that to a wrong position (this is made so that it can be adjusted by screwing it more or less). This doesn't seem too much the case though, since it would affect low revs more than top power. Check any problems with rebuilding and with the full power system, such as main jet ect. What carb is it?

[Hooverdarnit]

@arctor08 I changed the springs to the air intake valve and exhaust valve, not any springs in the carburetor.

After putting in new valve springs, and setting the gap between the rocker arm and valve spring, it still misfired at higher speeds/rpms.

While trying to figure out what was wrong, I noticed the enricher/auto choke had separated from the carburetor whent eh bolts vibrated out over time.

I put the enricher back on. Can't take a test ride now, it's snowing.

[arctor08]

@Hooverdarnit I'm not entirely sure if it is possible to lock this added fuel flow to "on", but it does seem to be the case, as it would explain the problems at high rpm!

[masonrox25473]

You speak English very well. (:

[thewow1239]

excellent video very well done thanks a lot

[ChickenCritters]

Grant....ed lol. Still I learned and good job man

[ratmphan]

insightful, thanks

[salahzan]

very nice, hope u put 3d animation as well, and better english as well

but thank u

[Stegmutt]

Nice explanation... and your English is better than mine- and I'm a native speaker!

[SuperchargedMustang5]

That was awesome

[jrs89]

Nice job. Five fist pumps for you.

[johnybrokeit]

thank you for your effort to create this video. fantastic!

[NapkinsAndDiagrams]

Very good! Well done, I have been in instructional videos and in front of a camera, it's not always easy to get people to understand what you explain, but you did a great job of it! Thanks for the video.

[Matuxmatux]

Nice, man! Can you do one on fuel injection?

[theodricaethelfrith]

Excellent!

[knightslucky]

Hi! im looking for a diaphragm then i saw your video, its the same...are you using mikuni carburator? pls. help me with the model of the carb. kindly send it to me if its ok to you..patcunananjr@yahoo.com

thanks

[arctor08]

@knightslucky No, I'm sorry it's a Walbro WVF 28 carb. But I have no real digrams of this either, I just did those drawings on paint!

[knightslucky]

Hi! im looking for a diaphragm then i saw your video, its the same...are you using mikuni carburator? pls. help me with the model of the carb. kindly send it to me if its ok to you..patcunananjr@yahoo.com

thanks

[MRpeanut222]

Thanks!! Actually pretty helpful.

[Trialanderror502]

Were you in I Am Legend?



[arctor08]

@Trialanderror502 Nope..!

[boat6868]

I agree with many of the other posts...great vid!

[rinsedpie]

useful basics



[neurodude45]

Great video! A little tough to understand at first (had to do a couple of double-takes) but the concepts were explained VERY clearly! Good job!

[MrMooseful]

Wicked good man, viva Italia ? :-)

[BuffaloWarrior7]

One of the better videos out there, thanks

[AirPickles]

Are you from Hungary?

[arctor08]

@AirPickles No I'm italian!

[logansteels]

You look so young but did an awesome job. I'm sure you'll inspire many people. Well spoken dude!

[Commando303X]

I have NO IDEA what the hell you're talking about (or even what you're saying...).

[magicmax27]

your very cute. i think i like you alot. xxx

[nimajnebula]

simple and effective explanation nice

[MSigmasiX]

Great video! 

[minicopilot]

Seriously, your delivery is very cool and so is your accent.Well done!

[minicopilot]

Great accent and delivery! Very informative clip! You should be an actor or work for NASA!

[arctor08]

@minicopilot Hahaha! Thanks!

[takadi]

Can't wait until carbs become obsolete...fuck I hate these things

[boysvandehood]

Next vid please, interesting stuff

[Crazyscrub]

Good vid

[bellben]

Great video. Thanks.

[mabizeid]

why dont you make part two and explain about the other issues you didnt have time for?

[arctor08]

@mabizeid I wanted to improve and complete this video, and make others on other parts of the engine. However I don't have much time in my hands to do this! As soon as I will, I'll make them. Thanks!

[69sico96]

really good video. very simple but very imformative.

[INCOGINT0]

good job

[UncleSam493]

but how is the air sucked into it in the first place? I understand it makes the vaccum, but if the engine isnt on, what is getting the air to be forced into the venturi

[arctor08]

@UncleSam493 The starter motor (or the kickstart, or the string you pull to start the engine) turns the engine (the cranckshaft), which then sucks the air in the cyliders since it works as a pump, which then forces the air in the venturi.

[billyhoglover1]

@UncleSam493 the air is push in not suck.. is called Atmospheric pressure i hope this help

[BernardASU2009]

@UncleSam493 Atmospheric pressure, there is no so-called sucking of the air.

[arctor08]

@BernardASU2009 yes it is atmospheric pressure which forces the air inside. However "sucking air in" is just a common way to describe a difference in pressure between two separate zones. So I guess both could describe this situation!

[evodean666]

@UncleSam493 high pressure always wants to get to low pressure :)

[magicmax27]

ur really cute. xx

[paulthew2]

abdulios:

Your point is?

I have a 1983 Nissan Pulsar, and want to clean the carb, and would like to know how they work. This was a good intro.

[paulthew2]

Good, simple intro. Thanks.

[rotaxtwin]

Good video and narration. I was looking for a video to help explain carburetor function to my 4-year old and this was helpful!

[abdulios]

Except nobody uses carburetors anymore,. It's all electronic fuel injection. although push lawnmowers still use them, as well as hedge trimmers but those have are 2-stroke engines as opposed to the usual everyday 4-stroke.

[wanderer1031]

fuckin' accents. what now? 

[sweatyhot]

Man you are so smart. I don't understand mechanical things at all. I'm trying to learn now but how did you ever learn so much about them?

[evilmatchbox]

his voice is WAy to deep. thought it was fake at first lol good simplified view

[Thetruthishere11]

very good.

make the other videos

[ryomali]

Awesome vid mate, to be honest I thought your vid was going to one of those annoying kids talking with a high pitch voice but hey! You have some low register. Thanks mate, hopefully I'll pass my exam (I'm doing Mechanical Engineering)

[meanman1992]

@ryomali could agree more about what i was expecting

[tadeuszsztajnert]

Very nice. Thank you :)

[eckyspondoolie]

Well done. Do you know if hydrogen cars use similar carbs.

[arctor08]

@eckyspondoolie I don't know if you can use a carburettor for hydrogen engines since the carburettor is not sealed, and hydrogen isa gaseous at room temperature. You would probably need an injector. But I don't know much about hydrogen engines! Sorry!

[meanman1992]

@eckyspondoolie hydrogen cars don't actually burn hydrogen

they use a special cell that combines the hydrogen will oxygen in the air to make water H20 in doing so it creates electricity and a electric motor is what powers the car

if u are talking about LPG that is a different story and im not sure

[arctor08]

@meanman1992 what you explained is a hydrogen fuel cell. But there are also hydrogen internal combustion engines which work similarly as normal car engines.

[phatt180]

Good video, Explained very clearly.

[N61601]

Excellent primer! I need to know how to change the needles in my 40mm Bing carb.

Do you know of any videos that might show this?

[arctor08]

@N61601 Well if it is a carburetor as the one seen in the video, you need to remove the top part, extract the slide with the membrane and the spring, and extract the needle from inside the slide. If, instead, it is a carb with the slide moved by the accelerator cable, then similarly you need to remove the top (where the cable gets into the carb), extract the slide, pull away the spring and slip off the needle from its location. I cant really find a video now, but dont worry its easy!

[domyaska]

GOOD JOB !!! THANK YOUUUU

[availeblename]

great video man very informative and answered a lot of nagging questions. cool accent too! more vids to come?

[arctor08]

Haha thanks! And thaks also for the comment on the accent, but I'd much rather not have it!

Anyways, I don't think new videos will come for the moment, maybe this one could be improved though, since this was a project I had to do, which could last no more than 3 minutes.

[elebeu]

Good job. I was familiar with most of this from automobile carbs., but the info on the slide was very helpful. Thanks.

[blueeyedguy18]

that was a great explantion my friend. Well done. Told me quite a bit.

[ameliajenroxx2]

thnx this helped me with my project.....keep up the good work....

[kurittaja]

It's an old Keihin from a Harley! Good video!

[arctor08]

Thanks! But it actually is a Walbro WVF 28mm from a maxiscooter.

[kurittaja]

So it is. I should've read the description. I thought only Harleys had CV's with accelerator pump. What kind of maxiscooter is it from?

[arctor08]

I don't quite remember but it should be either from a Piaggio Beverly 125, or an Aprilia Sportcity 125, both pre 2004.

[mechpsuedo]

@cs02000 

[mrjewishfish]

gj man good vid

[jordanritch]

good video not often i comment on vids, but this was well done.. I'm surprised to see you don have more views on it should be up at 10 or 20 thousand hits.. if you care enough and you want to get more hits you should add more tags so a greater amount of people will see it when they search..

[arctor08]

thankyou very much for your comment! I really appreciate it! I will probably follow your suggestion, not fot the views themselves, but in order to recieve feedback on how the explanation is! thanks again!

[lemko13]

@jordanritch look at it now aahaahhaahha! (and yes i realize that you posted this comment a year ago)

[qxrashidxp]

thnx