How Does A Carburetor Work? Engine Diagnostics 101 Go Kart Guru

[stanley3290]

great video...better than reading books and not understanding a thing ...

[sajjadwonful]

good video to understand the basic theory carburetor!

[dhavalkumargupta]

amaisin video..thanks dear..i ws too amateur,couldnt understand..realli helpd!!

[george2011k]

Wow just and excellent video cause lately I have been having problems with my go kart when I press on the gas too hard it cuts so I guess it has to do with the float. Thanks again

[gamblighini]

@george2011k Yeah you can run out of gas if you are flooring it for extended periods. The rememdy is a bigger bowl, or a bigger carb can help with the running out of gas problem. If it is the original engine on the go kart then you may want to look at the adjusment of the float. Be aware that if you make the float adjust to close to late (ie doesnt float enough) the gas will may drip out of the mouth of the carb, not a desireable effect....

[MrMooseful]

Thank you very much for this information!

[Whiteyy191]

Should have just said "Yeah the bowl/float is pretty much a toilet cistern"

[DeathByMoshPit93]

Cheers mate

[epicnessinacan1]

thanks i now can fix my go kart

[LowInProductions]

Great video. Easy to understand. love the simplicity

[Reymond810]

Very nice video ... especially for amateurs like me.

Thank you very much.

BTW ... now background music while spraying fuel ... lol !!

[LiLBoy1221]

Boul? 

[candydandy400]

It gets hot.

[halosavage]

hey, I think this is the best explanatory video on youtube. thanks for sharing!

[bluewaterjack007]

Thanks for the 101..very well explained.

[uglyguitarman]

And we have a baby on set.

[gamblighini]

Great question. The vacuum results this time, because the engine is drawing in air. Air has to come from somewhere, so instead of going through the main throttle body, it goes around and through the fuel bowl drawing a ton of gas into the throttle body. The venturi effect does not come into play when the choke is on in other words; the vaccum, you are correct does not come from air flowing over, but air being absent because it is being blocked by the choke plate: hence the name "choke."

[takadi]

How does the fuel spray into the carb when the choke is on? I thought that the only way for the fuel to be injected through the line is when a vacuum is created, and the only way for a vacuum to be created is to let air in, which the choke blocks.

[Mrphysics2012]

Very good

[cvnappsable]

Most helpful video award

[Foobyking9000]

Cool, Very informative, are most/all carburetors like this? i remaking a custom/modded 60's jeep with transplant carburetor engine.

[gamblighini]

@Foobyking9000 Most simple carbs are like this. Larger carbs on V-8s can be a bit more complicated having variable adjustments built into them but this is mostly for when you stomp on the gas the engine needs lots of fuel to get up to speed, so there are accelerator pumps and jets that pull out dumping gas into the manifold. Other than that the principles are the same.

[Foobyking9000]

@gamblighini shit,

the one i got is v8

[gamblighini]

@Foobyking9000 On v-8s there are several different types of carbs. The two barrel and the four barrel. The two barrell means it has two venturis and two throttle plates. It also has two jet adjustments. The jet adjustment is done by a couple a methods, using a test light and examining the spark plugs for color. The plugs should be a tan color. White means that the mixture is too lean. Black means it is too rich.

The four barrel is similar, and has two jets for adjustment.

[Foobyking9000]

Wow, thx

rebuilding a 60's jeep with a with custom/moded Carburetor engine, Pain in the ass, but this helps alot

[jphrockstar]

"theres a baby on the set.." lol that made me laugh, and his sound affects," phss phss phss." lol but nice vid.

[micksrr1970]

This is an exalent explanation of how a carb works, explained in easy terms that is easy to understand. If you listen to this you will have a good understanding of how it works.

[nilowong]

what is correct more air will come will leaser the consume of fuel or less air?

[nilowong]

hi i just want to know on how can i save fuel? is it by putting more air to come or less air to come?

[NiggaHauer]

Thank you for this.

[gusocorredor]

if a vehicle isnt moving, there is no air being forced in, so how come when u start a bike it stays on and sucks air if theres no wind???

[jah8942]

@gusocorredor The piston moving down also creates a vacuum and enough suction to pull air in.

[Vito305]

really helpful, thanks!

[fysga]

Perfect explanation! Do very best posted here in youtube. Many thanks to you gamblighini =)

[luffare1]

Easy perfekt for dummies :)

[weweeet]

Terima Kasih/thanks

[2wheelsteve]

Thanks for taking the time out to do this informative video, cheers

[mrN3w7]

thanks!

[chevyman5436]

Wow man, thanks:) looks kinda fustrating trying to draw it but you did a good job, keep it up!

[Jester486]

Great job on the video. 

[Jester486]

Great job

[kevinkuei]

Nice video--good simple explanation.

[lafirmlm]

I understand very clearly frm this video

thank U

[ARROWW13]

where can i adjust the olil olevel that enters the carburator?my bike drinks a lot of oil and my exahust is alll unnburned oil at the tip...i want 2 make less iol go in... srry 4 the bad english

[justinmcrouch]

thank you now my scooter wont constantly drip fuel on my garage floor!

[aMammoth]

While the theory is, ehhh, okay. Carburetors really work on the Venturi Effect, the bumps just increase airspeed so you get more Venturi Effect. Venturi effect will happen whenever you have a stream of air over a another tube.

[aniket8747]

really great video!!!!! i don't need to waste much of my time to read and imagine how it actually works...now while reading i can imagine ur video!!!!!!! thanks!!!!!!

[hobbes234]

Good video.. easy to understand.

[babhero]

really good.. thank you!

[madnesscombat5]

i have one qeustion, you showed how the choke sends air into the "fuel tank" instead of "over the bump" so is there more umm.. "openinings" to the fuel source then just that one tube?

[serchmarc]

ey man simple video but very good chek my video of my idle problem, in your video said the fuel stak passajes my runs fine with low to up revs or circuits but cant hold the idle,im gonna try to clean it up like u said any tips before i clean it?how u clean it?remove jets and spray?or i have to spray every hole and specially that little drilled tube inside that mix the fuel with air etcetc?my engine was satdown for 1 1/2year if u want chek my video.hesitates toomuch i think.

[gamblighini]

Typically to clean a carburetor remove all screw in parts, such as jets. Then spray carburetor cleaner into every hole and port. Use a compressor to blow out the holes in the carb. Do this multiple times. You may want to use a small wire to verify the carb jets are clean. If clogged, use the wire to free them up. Some caustic cleaners may be require to dip the whole carb in. See your local parts store for details.

[serchmarc]

well let me tell u ,i cleaned the damn carb just the top and the middle part ,used cleaner inevery hole i found into the plunger and now is worst,i have a super lean ratio,cant hold idle and the pump valve or plunger is stuck or i dont know cause when i pull the throttle the plunger just move like 5mm,doesnt run the entire stroke and now im pissed,i did it the same way is not rocket sciens but i ll have to do it again,thx for the reply,i ll post everyvideo i can,stay in contact thx

[dsmith308]

Why can't engines run with the choke on when they are at operating temp? When the engine is cold, it needs more fuel but it also should need air. Why does the lack of air when cold, not affect it when hot? Does that make any sense?

[gamblighini]

Smoke is a by product of incomplete burning. It literally is excess carbon (the black soot) that is being released directly to the air, instead of combining with oxygen and making CO2.

The choked engine will not run well because it needs more air: fuel alone will not do the job.

In order for something to burn it needs the correct stochiometric ratio (meaning correct chemical combination of oxygen and the hyrdrocarbon chain).

You can dump more fuel in, but the resut wil be smoke.

[gamblighini]

When an engine is cold, all the metal components need to be heated up.

In effect the engine becomes more thermally efficient.

As the comment before was made, the fuel does not atomize well at cold temps. What this means is that most of the fuel is clinging to the walls of the intake and the cylinder walls engine and not being burnt, effectively leaning out the mixture.

In plain English, not all the fuel is getting into the engine and being burnt.

[curtisjb1983]

I'm not an expert but I was always told that your engine actually runs hotter when you have a higher air to fuel mixture not the other way around.

[gamblighini]

Lean burn engines have the problem of heat. When you lean out the mixture the hotter it gets. It also works in conjunction with increasing the compression ratio. The limits in metalurgy limit how hot engines can get. The engines will literally melt. Lean burn engines can get really hot, so hot that the parts will melt in the engine, ie piston crowns, combustion chamber sealing surfaces, valve seats, valve stems, rings, cylinder walls, spark plugs, fueil injectors...

[curtisjb1983]

@gamblighini good info man, thanks

[madnesscombat5]

sorry for the other qeustion i posted, i had only watched half the video when i asked.

[curtisjb1983]

haha when I first heard the baby I thought i had audio malware on my computer. I was pissed. Glad you mentioned it. LOL

[jigmesam]

It's spelt "Course"

[gamblighini]

Of coarse its spelled course, but it you are like me...you get them mixed up....thanx.

[roycehellion]

um....you can edit it...i mean your doing an explanation with paint you might as well spell correctly

[frosticle808911]

love this video. very informative and well-worth watching

[embossbaby]

thanks, the float carburetor was forever confusing me until you explained it, nice vid

[BurkeHare1]

Brilliant.

Thanks for helping me to understand. Engines bewlider me.

[living4fire]

Thanks for a clear explanation. 5*'s

[dbxfx]

good video, but i disagree with the explanation of what the choke does. a richer air mixture doesn't cause the engine to heat up because youre burning more fuel. its because a cold engine doesnt atomize/ mix fuel as well with the air as a hot one. therefore a lot of gas is needed as most of it is not burned. you run the engine like this until its hot enought to atomize the fuel properly and becomes more efficient. hope this helps

[gamblighini]

Great comment. One thing we tend to do is zone in on explanations and try to isolate problems. The problem with that is we are dealing with a system. In this case, heating up the engine, such as the valves, the combustion chamber causes the gas to atomize better, and therefore effect performance. So technically both answers are correct. Thanks for the comment.

[overdosesalam]

thanx... nice xplaination, hekps me undrstand easily... although the graphic a little bit awful... hahaha... thnx btw...

[jrrm3]

Great post. Nice use of props including audio from baby !

[mrjewishfish]

good vid man helped alot

[riejubandit]

i thot this was going to be a pisstake but it was actually an awesome video! I still dont quite get the whole bowl thing though

[SpecPRDkarter]

Thanks. Helped a lot on understanding more about how karts work

[cgelangpare]

thanx... very nice explanation