How a carburetor works

[TwiceRader]

your voice sounds like andy's does in toy story 3

[semco72057]

For those who are new to this I like the video and showing us how the engine runs with the mixture of air and fuel.

[petersmellslikeshit]

noob

[curepunkx]

good job man! 

[bandguy360]

bravo 5*

[CharlestonChew03]

Nice video! Thank you! What do you think would happen if I lost a small button that gets pressed in by the float?? Will my engine blow up and kill me if I try to run my dirt bike? =O

[CharlestonChew03]

Ah ok, the "button" is called a float needle I just found out.

[darkazer451]

lol ty before this vid i didn't even know what a carburetor was :p now i do

[mcraelandscaping]

help!

carb on weedwhacker won't suck gas from tank. Just makes a squeaky, sucking noise.

Any advice?

please email to mcraelandscaping@aol.com

[Thetruthishere11]

@mcraelandscaping

need to clean the carbs. Varnished up - gummed up. Spray some gumout in there. If that doesn't work then youtube search weedwacker carb rebuild.

carburetors suck. 70% percent of the time they're the cause.

[DaN4zz]

on my bike, kawasaki ZXR 750 it will start one day but wont the next, and if i have it going, i turn it off and leave it for 5 mins it wont start again, wont even fire, could this be a carby problem? it has spark and everything so thats not a problem...

[kingkruel123]

Davids farm rocks!! ^^ this guy sux!! losseerr

[MultiKhaz]

If all home owners knew how to empty their carbs and treat their gas, then I would be out of luck in finding trashed lawn mowers. Almost 75% of mowers that I find have dirty carbs or stale gas.

[jagpit1]

i need help with my tecumseh car would you help me out thank you

[C0LL1N]

whats wrong?

[gary77777778888888]

ya air fule mixtuer is very inportant not only for optimom preformens but also it runs cooler if its to lean you are taking in to much air and it heats your moter up and it can even seaz your moter and if you got to much fule its runing rich and then you end up with a lot of un burned gass and it can foul your spark plug expeshaly if its a two stroke and that depends a lot on what you mix your gass at i prefer 32.1 but my bike runs perfect with that mixtur but it verys betwen bikes

[gary77777778888888]

The fule reserve has a valve also when you have your fule line pluged in to the caberrater then it enters the fule reserve and there is a floate that when the reserve is full there is a needle type of plug that covers the area where the fule enters other wise it would start poring fule out of the carberator. Somtimes a float will stik and when that happens it just gets fluded and most of the time you can tap the carberator and it will unstick the float. After its flooded hold the throttle wide-

[gary77777778888888]

open to start it bealeve it or not it helps ive worked on enuph vehicles to know and i have dumpted my bike enuph to know. Also there is a nother plate in most carburaters that is the choke and you use it when starting the engin when it is cool. And lots of carborators have a diafram that pulsates like a speaker and that delivers the fule. There are many types of carberators 4 barol 2 baral 3 barol 1 barol 4 barol carbs are ushaly on v8. most vehicles have a fule pump to deliver the fule

[vikas6844]

good

[spacemonkeys0681]

I have a Vespa ET2 50cc, I tried installing a performance air filter and as soon as I tried riding it it was like shocking and wouldn't got full speed, it made it worse. What can I do to balance out the air and fuel mixture

[Slangbox17]

Well now you're looking at re-jetting the carb to a bigger jet so you can get more fuel flow to match your increased airflow. Google search "re-jet a carb" and "drilling out a carb jet". Good luck.

[wanderer1031]

@spacemonkeys0681 just drill a 1/16th inch hole right in the top of your carb and hook a tiny hose to it and run it to the fuel tank to compesate for the increased airflow. if that doesn't work, junk the vespa and get a real bike. (shhhh guys, i'm trying to HELP him...)

[thedixie60]

I had a problem with the carburettor on my bike and was wondering how they work- that was an excellent explanation cheers. When I was looking at mine I noticed there was a kind of rubber diaphragm inside the carb- can you explain what that's for?

[Slangbox17]

Hmm... I'm afraid I'm not sure exacty what pure referring to.

[f22raptor861]

@Slangbox17 find*

[jigmesam]

@thedixie60 it could be the gasket, but probably not if you described it as a "diaphragm". Can't think what else it could be.

[dmellow45]

hmm i just had a prob with the carb on my lawnmower. i hadnt done anything with it, but i removed it and sprayed some fuel in and it ran, so, maybe this boiling thing will fix it..

[Astro29]

Well, a carburettor has two important parts. A venturi which (if cut away from the side) looks like an hour glass. Its job is to increase the air speed or pressure at the output side (throttle) of carburettor. This helps in the mixing of fuel/air making it more volitile. Second, it also has a float/needle & seat which controls how much fuel reserve it has. The float chamber is connected via a jet into the venturi. Two much fuel in float area, carb floods, too little it starves.

[Slangbox17]

Yep.

[f22raptor861]

@Slangbox17 cool explenation........ the venturi tube also helped us to ind the aerofoil!!!

[quingquad]

THANKS

[Lenie669]

Thanks for this - I sat in my class today and my lecturer tried for 2 hours to explain this technology - I learnt more in your 2 minute video - cheers!

[aaronthomasa]

aahha lol

[storytimetoo]

nice job, Slangbox

[shakespir23]

queer!!!!

[Slangbox17]

Amazing. With that simple derisive statement you have solidified your dominance in the YouTube society, and will henceforth be addressed with reverence and respect. I humbly thank you for your contribution.

[vsvitlana]

we are three blondies. from now - BIG fans of carburetor.

THANK YOU!!!!!!!!

(:*)^3

[mickwolfiv]

Great Job!

[jamianm]

Thanks for teaching me

[lesscunning]

excellent video !!!

[SilentSinX7]

the "throttle valve" is called a butterfly valve. im sure there are diffrent ways but yeah

[Slangbox17]

Well "Butterfly valve" actually describes a type of valve. So the throttle plate is a butterfly valve.

[eg7on]

Great job for explaining to "no-tech" people like me. Close-up pixs, simple explanations. So many instructional videos mention parts but never point them out. You did great - do more.

[Fuzzy159lentz]

i have the same carb but mine cant hold a idol i have to keep primeing it does any one know wat it is?

[kamilek2929]

you have to adjust the jet screw on the carb so that either less air more gas or more air less gas goes in...try to play around with it..

[manindersinghbirdi]

good video

[mstruckerboy]

Very nice job dude! You learned me a whole lot!

[drifttune]

Awesome, now I understand

[devinefist81]

Cool Video... im gonna buy a mazda b2000 carburator truck.. just a little info vs EFI

[MRSketch09]

Hey good video! The only thing that would have made it better is if we had the option of High Def... so we could see the needle you were talking about.. but hey there's always google picture search.

Anyways, great explanation! I am surprised, but I understood you on the first go around. Your a good teacher.

[Slangbox17]

Thanks, I appreciate it.

[Chasmaster244]

The "needle" he was talking about its the gold thing sticking up coming up from the bowl

[MRSketch09]

Thanks.

[ownedncut]

THANKS

[colebabb]

ive got the same scotts 6.5 intek edge mower

[bulletgt3]

well it gets no fuel at all it must fight to get the fuel (NOT GOOD!!) so there is a low speed needle and maybe a high speed needle. u have turn and mix whit the low speed needle just to adjust it a little then it is jsut to throttle like hell :D

[XTIRP8]

can anybody give me some tips on how to adjust a 2-stroke carb on a 50cc bike? cos im pretty sure its why my bike doesnt run, i think when i cleaned the carb i played around with the timing screws and now after i prime the cylinder and attach the tank and kick it, it starts and roars up like hell for a few seconds and dies again. if anybody can give me some help it would be great thanks.

[anditz]

if its red lining id say you put the accelerator cable in 180 degrees backwards. as for the tune on the fuel mixture and idleing screws ther should be a forum on the net somewhere telling you how many turns it needs to get it started. then just go from there, tune till it starts and then so that it revs comfortably

[XTIRP8]

the throttle cable isnt correctly set up i dont think that may be why its revving high and i doubt ill ever find any info on the bike cos its from about 1970 and i think its pretty rare

[anditz]

ah k yeh i was just speaking from my experience with the carb on my atv. looks like you got a lot of trial and error to do :P good luck

[XTIRP8]

hahaha yeah i bet theres loads of things that will make it not want to run, but it has been running fine. like maybe a year ago when my friend owned it, he was riding around on it until he snapped a wire to the magneto and probably got some crap stuck in the carb.

[anditz]

yeh maybe take a video of it so some of the "experts" here can give you a hand lol

[ahmedhazem83]

It is like the idea of working of a perfume spray

[emil3m1l]

if there comes water into the carburetor, How to get it out? pleas help me.

[2003Yamaha125]

depends where it is, but u might be able to get it out with compressed air and just blow it

[Slangbox17]

I'd say unscrew the resevoir on the bottom, drain it, and let it dry for a day or so. Then clean it out with some carb cleaner, bolt it back on, prime it, and try it out.

[sucklava]

It combines fuel with air to create a spray. A spray is easier to ignite than straight out liquid gas.

[JackJamesElias]

I wish you had taken that carb apart. My Craftsman push lawn mower carb is gummed up, I think. The local lawn mower shop wants $50 to fix it, which seems reasonable. But I like doing things myself. Are there many little parts inside, and are there things inside the carb that should be replaced? Is it enough to just clean it out with carb cleaner?

[Slangbox17]

Actually on this carb, about a year ago it wasn't working very well and so I found that the jet got gummed up and I cleaned it out with carb cleaner and it's worked fine since. I'd definitely try cleaning it.

[randalwc]

And if that don't work, then take all the seals off, put it in a hot boiling pot of lemon juice and let it boil for about 20 minutes. Then boil it an additional 10 minutes in distilled water to rinse (or rinse in a big bucket of cool water). Then blow out the water with compressed air.

[BasementBen]

Iv'e noticed that a carboratour in my mower somehow sucks the fuel up, with out any tubes or anything, so I am guessing that gasoline vapors are sucked into the air intake, am I right?

[Slangbox17]

Hmm, I'm not sure what you're referring to. You mean there's no fuel line from the gas tank to the carburetor? That would be... black magic. haha.

[BasementBen]

Well, usually I see a fuel line tube in egines like riding mowers, but my simple Yard Machines mower has no tubes for fuel lines. The only thing that is in the liquid gas is the priming bulb tube. And the venturi opening has no tube, it just seems to suck up vapors.

Oh well, some things just work and I might not understand, which is funny.

Thank you.

[1G0TP1NK8C1DB00TS0N9]

Suction from the engine is what sucks the fuel through. On a riding lawnmower where the fuel tank is in the back, there will be a vacuume pump on board. A pulse line goes from the OHV cover into the pump, pulses from the engine create the power to run the pump which sucks the fuel on through.

On some push mowers, there is no tank with a fuel line going to the carb because the carb is attached to the tank, its called a diaphram carb.

Peace :)

[BasementBen]

Yes, a diaphram carberatour. It is interesting how they work, yet simple.

Iv'e learned a lot more that of 5 months ago, hhheeh thanks. :)

Ben.

[1G0TP1NK8C1DB00TS0N9]

Indeed you have, I am proud of you :)

Peace :)

[C0LL1N]

its it one of those briggs carbs that sits on the top of the gas tank? if so they dont have any hoses because they use the gas tank itself as a carb bowl, and suck the fuel right up from the tank with long plastic pickups.

[Jon20202]

Good work. 2 suggestions: Use a tripod or a book to hold your video camera steady so both hands are free to demonstrate and perhaps a desk lamp or out in full sunlight so the image quality would be better. Maybe show the carb in relation to an engine as well.

[Slangbox17]

Thanks I'll keep that in mind. This was sort of a spur of the moment thing at 11 PM, so I wasn't really thinking about how it would turn out. Haha.

[jayguy173]

cool do lawn mowers have fuel pumps

[Slangbox17]

Nope. Well, not your basic lawnmower anyways. The carburetor's just gravity fed from the top-mounted gas tank. So don't go starting it upside down ;-)

[olebmx]

not enige, cylinder*

[akimjjb]

Great explaination. Questions: 1)What powers the air through the carburator exactly?? 2) How come the fuel doesnt drop when the engine is off? 3) How does the amount of fuel changes with the amount of air??

[Slangbox17]

Good questions. 1) The air is esssentially sucked in by the downward movement of the piston on its intake cycle. 2)I'm not sure what you mean by the fuel dropping, but if you mean why doesn't it drip into the carbeuretor, it's because the fuel reserve is underneath. The amount of fuel changes with the amount of air because the fuel is not pushed into the carburetor, but is sucked in by the vaccuum created by the air, and the vacuum strength increases with faster airflow.

[akimjjb]

thanks for answering

[ryanjohnchase]

good work man...looking forward to more postings

[coshyno]

thanx for posting. very informative

[Hansmiseur]

well you explained it pretty well, but you should add some images from inside because the camera can't go there.