How to adjust a carburetor, jetting and mixture explained!

[@thejunkman]

If this video helped you considering giving "THANKS" ❤ it goes to help making more videos like this.

[@vongsakra253919]

It’s been four years for video. It remains literally helpful today. With great appreciation to you.

[@thejunkman]

Share it around. It helps out the channel to make more.

[@joelml7921]

So far, out of all the Carb videos, this one is by far the best one as it relates to the details and functionality of the carb. Thanks!

[@TN_HondaDad]

Very nice Junkman - you truly are a teacher by taking the time to demonstrate the basics with your model. Thank you!! Carb101 basics are key to anyone who rides a carb bike and will ultimately need to troubleshoot/tune.

[@thejunkman]

Thanks, its wht I do it.

[@Da_Storm_420]

the animation dit it for me, i kinda understood carbs but now i do understand them even better thanks for that!

[@lorano100]

Great video for anybody who doesn’t know how a carb works👌🏻

[@EarthStory]

Hell yeah brother. First video I found of yours because I'm rebuilding the carb on the 85 van we live and travel the world in. Your production is superb! Really excited to have found both you and Matt's channel. Cheers to many happy hours of viewing!

[@thejunkman]

Thanks for the support. Keep watching!

[@jeankwete3833]

Looking for cub for Mitsubishi Colt 4g63 2003 model

[@QuangNguyen20]

I like the use of green screen like a weatherman

[@cartoonist1975]

thank you for going through ALL the trouble . Needed this ! ! !

[@endurofan9854]

your vid with an animation is awesome... it makes it easier to understand... thanks a lot

[@crippleguy415]

You are the man 😎👍🏻 . Very very good explanation . You could teach some teachers how to teach with your awesome explanations. 👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻

[@WaraxTheThird]

This was fantastic. I just got my endorsement and know a LITTLE bit about the more complicated stuff on engines but this was great at really giving you a look at things! Helped a ton.

[@jmac3693]

I did learn something here, but I'm still just as dumb as I was before lol

[@dennis1802]

Well if you keep learning maybe you get wise one day.

[@mboyer68]

Awesome video!! Thank you for taking the time to create this video, the animation, and the bench top models..you're awesome!!!

[@Charlie-Cat.]

Hello, We did all the hoses and check for leaks and that was all good. the throttle shaft has to play in it.

[@kylemansell2054]

This is amazing, i'm trying to figure out the mechanics of karting before I get one and I'm a little overwhelmed since I'm more of an IT guy haha. This completely answers all my questions for why they okay around with that screw while driving and how it works. Thank you!

[@kylemansell2054]

While they play * around with the screw

[@thejunkman]

+Kyle Mansell the screw only affects idle speed only, I though I made that clear in both videos.

[@ShadySoldier222]

Thanks for replying to me and also checking out my video to listen to my bike. I think it just had the carb cleand but I cannot be sure. Thanks again JMan ✌

[@thejunkman]

It is possible that some manufacturing swarf has broken loose from the tank and now is clogging a passage in the carburetor. It is semi-common.

[@ShadySoldier222]

thejunkman aw rite so need to take the carb of then me thinks?

[@ShadySoldier222]

thejunkman Hey JM should my chain be greasey? As my chain is just kinda dry and no oil on it atall.. I I'm on a shoe string budget with my pitbike lol and know the basics about bikes I have a 125cc kymco road bike it is a 2000 reg.. And the problem I'm having with that bike is the regulator rectifier that is to do with the AC/DC currents its not holding a charge into the battery and there for it won't start. So I'm stuck till I can get it shorted.also the choke switch which should it be up for on and down off, also should I only use the choke on my pit bike when I'm cold staring or should I keep it on or wha t?? Thanks for your time J Man..

[@thejunkman]

Chain should be lubricated. The battery might be at fault on the other bike. Which does your carb have a choke or an enrichment. If it has a choke, the valve should be open for "off" if it has an enrichment plunger when the plunger is down it is "off"

[@ShadySoldier222]

thejunkman so the plunger us like a little flip? Also doe's that take in extra air? What would you suggest for the chain WD40 or I have some car grease would that be better? Also how can I tell if it is the battery on my road bike? Much appreciate your time junk man Thanks

[@siddhantchavan1370]

Really loved the explanation and animation! Keep it up!

[@thejunkman]

Thanks

[@charlesaustin566]

Extremely helpful and informative video. I have an 09 Yamaha Zuma and the spark plug keeps fowling. I don't know what I'm doing for the most part but this video is helping. Thanks!

[@donovanlucibello379]

Great demonstration and explanation!

[@alexchristian5399]

Great demonstration explained really well and made it much easier for me to understand how and what rejetting affects

[@tamusbaby]

Great explanation!!! Thank You... your enthusiasm shows...

[@sw74glssuperstar61]

thank you for an excellent explanation on the vacuum and non vacuum cars it puts into prospective what the carb is doing at any given time thus allowing diagnosis to be achieved!! If you understand how something works it's much easier to repair rather than just going through fault finding guides and relying on guestimation etc many thanks

[@thejunkman]

I have a new video coming that I hope will expand on this topic as well.

[@frankcrawford416]

Great explanation on carb metering circuits. I didn't really know but I knew that the jet needle must control the main, but did not understand completely. Why does the pilot jet stop pulling fuel at mid carb valve openings? Thanks.

[@thejunkman]

Good question and observation. The reason the pilot stops contributing fuel at half throttle and above is becuase the vaccum created through the carb is lower and the extra fuel being pulled through the main jet drops the fuel level in the bowl just enough that the pickup on the pilot jet is not submerged so it can't draw any fuel. Its a delicate balance going on that is why certain adjustments overlap a little. Check my website for more detail and visuals.

[@frankcrawford416]

@@thejunkman Wow! I have been working on my 400 2-stroke for 12 years and did not have a clue. Thanks for the info. Frank

[@RemarkableSean]

Wow, what a fantastic lesson. Thank you!

[@6paxAbs]

Wow. I actually learned something today.

[@thejunkman]

Glad you did!

[@damianmlamb]

Good first comment I want to see on a video like this

[@quintsorbelli8705]

EXCELLENT EXPLAINATION!

[@anno.nym.faceless]

Good explaination!, that put the details in place for me. thankx!

[@deepbludude4697]

Junkman, I have been working on carbs for age's well since the mid70s, but I never really understood what all the stuff was actually doing, well I kinda did but anyway nice demo.....

[@thejunkman]

Thanks. I am going to make a similar video discussing just the float height. I mistakenly assumed people knew why it is just as important to have it set correctly before jetting.

[@ACommenterOnYouTube]

HOW have you been working on carbs since the mid 70's and not know what the "stuff" was doing...?? Its like saying ive been a mechanic for 35 years but really don't know how and engine works ... OR Ive been an electrician for 30 years but i really don't know what the Ground wire is for let alone why there is a ground rod outside...

[@sh.osmanov6792]

Very useful information. I have to make some carb tuning on a 125 two stroke after I derestricted it so it doesn run lean. Some say I have to change the throttle slide too if I go richer on the idle and main jets. The slide is kinda pricey(about $60) here in Eastern EU. Right now it's 40 and I maybe have to buy a size 30. Do you think it's necessary? The carb is Dellorto phbh28 right now the idle jet is 50 and I will go maybe 52. Main jet is 132, maybe I will go 138 or 142 at max.

[@klrmoto]

How do you verify the pilot jet pathways are clear? That is a great carburetor diagram!

[@thejunkman]

Usually by spraying some aerosol cleaner through the pilot jet and making sure it comes out the tiny hole in the throat of the carburetor.

[@klrmoto]

Ok. I did that with success. Thank you! I sprayed B-12 (it is mostly acetone) from the air side in and let it run out the little hole in the throat ( I had the needle valve in without the spring/washer/o-ring so it would run out the throat holding the carb upside down). I did that a good number of times to make sure it was clear. I used alcohol to clean out the acetone and compressed air to dry it all out.

[@klrmoto]

Part of the air/fuel circuit for the pilot jet was drilled and plugged with a small brass fitting. Have you ever removed one of those plugs then re-install another plug after cleaning?

[@thejunkman]

Those plugs are not meant to be removed. They are there to plug a passage used when the carburetor body is cast/made. They are known as welch plugs.

[@hugofelp]

Fantastic explanation! Thank you

[@sidecarbod1441]

Quite a good explanation of how a carb works but just as the throttle is cracked open the pilot circuit feed the transition circuit as well as the hole that delivers fuel at idle. Also at idle not all of the air the that engine requires is delivered via the pilot circuit, air still flows down the main venture, the air the flows down the pilot circuit is really just to create a vacuum above the pilot jet so that it delivers fuel. The air flowing under the slide down the venturi is then mixed with the fuel that the pilot circuit is providing. The main fuel circuit as air fed into it in order to help atomize the fuel and tailor the fuel curve.

[@owl1873]

Thank you Junk Man.

[@Rdinhoo]

Very well explained. nice editing too, keep up de good work!

[@nightmarefoxyfnaf474]

Another great video Junkman!

[@thejunkman]

Thanks

[@kevinstearns4198]

@@thejunkman my 150 cc scoot is useing gas worse than a hemi. top end low on compression or carb jetted to weak. where do u set the float level.

[@droski33]

HELLO GREAT VIDEO - CANNOT FIND FIRST VIDEO YOU MENTIONED DEVOTED TO PILOT JET / LOW SPEED CIRCUIT

[@thejunkman]

Link in the description and on my website.

[@Blockbuster2033]

Very good video! I do however have questions, just to clarify: The idle air screw is affecting the mixture when the slide is all the way closed?! So when you open the slide by a very small amount it is basically the pilot jet and the idle air screw that effect the mixture?! The pilot jet and idle air screw effect the mixture at all slide openings, but it's effect becomes extremely small at larger slide openings?! Or does the "vacuum leak" in the idle circuit by opening the slide make the idle circuit stop working? The main jet size also effects the region where the needle is mainly metering the fuel, but not very much?! Also: Some carbs seem to have an additional jet on the top for full throttle enrichment.

[@thejunkman]

Generally you are correct in your thinking, but here is the deal. The idle mixture screw, has a negligible effect after the slide begins to open as the pressure drop makes the air passage (in the case of an air screw) more or less irrelevant because the air or pressure drop is going to happen in the venturi and not the air passage. In the case of a fuel screw, the pilot and then main jet are sucking the fuel down below where the pickup for the fuel passage is so it basically stops working as well after the slide begins to move up. I hope I am answering the question you are asking.

[@Blockbuster2033]

@@thejunkman Okay yes it seems you answered my question. Thanks a lot. Carbs are incredible pieces of mechanics and I think fully understanding them is key to be able to tune them.

[@garlosmontoyotana3316]

Dude, I loved that makeshift carb. That was so satisfying. Did you come up with that yourself?

[@thejunkman]

Yes

[@tomnekuda3818]

Good video.....you put a lot of work into it! Obviously 4-stroke.....do you have video on 2-stroke carbs? I was surprised by the turbulence in the venturi mock-up that was not helpful for a clean mixture......I'm wondering if that happens much in actual carbs.......

[@thejunkman]

A carburetor functions the same way regardless of two or four stroke so this video applies because the carburetor doesn't know what type of engine is doing the suckingof air through it.

[@tomnekuda3818]

@@thejunkman I know that this is true but I always have a harder time getting idle quality and jetting thru the range with a 2-stroke.....so I was looking for tips. I've been jetting cars, bikes, and drag cars for years but 2-strokes sometimes drive me nuts! Keep the Faith

[@crazytestpilot1380]

Great work here, thank you for your effort. I would like to ask you ......If I wanted to put motorcycle carbs(4) on my 2400cc vw air cooled engine (in a sandrail) instead of weber IDF carbs I have now, (48 idf's w/36mm venturis) how would I figure out what size carbs to get? Again, great video, all business no ego, pro grade stuff. Thank you.

[@apoptosistw]

Great video! Thanks ! I have a question about pilot jet , in this video you mentioned pilot jet has no function anymore with full throttle when main jet engaged, can you explain a more bit about why ? Since the pilot jet is still open , why not jetting fuel when full throttle? Is this happen in both type of CVK and straight pull carb ? How about idle mixture , is this effect mixture for all throttle range ? Thanks !

[@HTMR]

Nice video Junkman!

[@thejunkman]

Thanks. Share it around to those that might find it helpful.

[@jefecitamamajosita5321]

thejunkman vtebki

[@haroonrasheed9999]

Dear junkman and matthewmcrepair. I have installed the 125 cc motorcycle carburator on my Honda Civic 1987 automatic car. Can you both help me in adjusting a few settings?

[@haroonrasheed9999]

@@thejunkman Dear junkman and matthewmcrepair. I have installed the 125 cc motorcycle carburator on my Honda Civic 1987 automatic car. Can you both help me in adjusting a few settings?

[@frederikderoo4243]

my Keihin runs very lean. and I could not get te right mix. But my hot start is removed. so now I might have find the problem. if the hot start is removed wrong it might leak air and makes it run lean even when the mixture crew gives a lot of fuel. so thanks for this explenation!!!

[@thejunkman]

You need the hot start in and functioning for this carburetor to work properly.

[@frederikderoo4243]

@@thejunkman Great to know, going to work on it soon. ill let you know when I found out if that was my problem. but I don't have the hot start handle. so if the port just sits down it should not be a problem leaking air right? thanks anyway for your respond !

[@thejunkman]

Right. It should be fine.

[@PhaedruS007]

Hey Junkman- I'm pretty sure you answered the question that led me here, but let me be precise- I have Mikuni VM34 carbs on an XS650. These are actually 2 stroke carbs so they have an air screw ahead of the slide. My question is how much of the throttle travel is that air/fuel ratio screw really effecting? I am recently thinking that it is only idle, but it seems to be the first 1/3 of throttle.

[@thejunkman]

It has a very nominal effect above 1/8th throttle as that is where your pilot and main jet are working in concert, just like my animations are trying to convey. I also have an idle mixture video you should watch that talks about that mixture setting alone.

[@kolilagephart3766]

It should be added that al parts of the carb can effect tuning .Different pilot jet sizes , needles with different taper profiles, slides with different cut-aways and main jets are all available . I have seen many racers on dynos only worry about top end jetting not knowing that it's mid-range that gets you out of the corners first.

[@thejunkman]

That is the whole idea of the video, but you have to watch until the end.

[@JEHERETIC]

The issue I'm having is from idle I throttle it fast and it bogs out and cannot figure out the proper jetting to eliminate that

[@girishlg416]

Great video and superb explanation. Love it.

[@ShadySoldier222]

Just released I had not even Subscribed to you yet.. There Done. You are an awesome instrumental guy to have at hand, Thank you for your time dear Sir. ✌

[@PrimagenVanAtlantisLichtspiele]

Good job !

[@jerryking1434]

Great explanation... Thanks ...👍👍👍

[@zaynewarfield9668]

Good stuff man

[@noahwhite4290]

This is a great video

[@granttoye5852]

Trying to set up an SHA carb on an 80cc bike for high alt. Around 8,150' bought a jet kit between 50-70. Question: what does that dimension reference? Also, it seems counter intuitive to me to lean the mix with higher alt. Also, spark plug color diagnostic? White is too little fuel?

[@nucspartan321]

Great video, thank you

[@dauntlesspk8807]

Extremely informative. Thank you!

[@Random-ed2xf]

My motorcycle shuts off after I pull in the clutch at higher speeds. I have some pilot jets on the way and may adjust the needle. I hope that works otherwise I have no idea.

[@drumwhacker]

Question, I just got a bike that was running rich, so I proceeded to adjust the idle fuel mixture screw. While it was idling I closed it letting it seat gently. It kept running, although not very well. It is now at about 2.25 turns out and runs great. My question is, does it really matter that it didn't die when closed, since no bike ever runs like that. If there was any damage to the seat, so what, since it is at an appropriate setting? That's the real question I have. All I ever heard is if the seat is damaged then you have to get a whole new carb. Thank you in advance.

[@giorgiofireblade]

I have a tuned single cylinder 180cc cbr and I want to know the use of a 50mm velocity stack vs a 100mm velocity stack, thanks

[@thejunkman]

Neither will make a huge difference in performance. A good air filter is fine.

[@giorgiofireblade]

@@thejunkman I mean which one will give me better torgue? And which one will give me better high rpm?

[@fukcg00gle95]

Best. Demonstration. Evar.

[@thejunkman]

Thanks!

[@carlodangelo8348]

nicely done Thanks !

[@ImCaducify]

My 2005 ninja 250 won’t start I had it running. It has new battery, new plugs it turns over and turns over but doesn’t catch a start . But maybe one time here and there .. I just replaced those things yesterday also. Carbs are cleaned I pulled them and took apart

[@thejunkman]

As long as you are positive you're getting fuel into the cylinders as in the spark plugs are wet. It sounds like you ran into an ignition problem that is preventing the spark plugs from sparking check that the engine stop switch is not grounding and other things related to that.

[@glennferguson2526]

Great class, you guys should be holding school some wear. Thank you for a great video.

[@hiphopman72]

Well explained ! Thanks

[@VirberelloScooterTips]

Great video very informative Thank you for sharing this video with us

[@rodrigoandrescepedaperez7877]

Hello dear. I have a 1981 Suzuki GS850 that I have transformed into the cafe racer style. Since always, after the transformation, it has given me problems in the carburation due to the installation of POD's type conical filters. I have tried to find out enough about the subject, but it seems that it is well entangled. I even acquired and installed a set of larger jet´s recommended to me by several people. The problem persists ... in low walks perfect, but in high the engine seems forced and the final speed does not exceed 90 Km / hr. Could you give me some recommendation? Thanks and regards"

[@ISeeYouOliver]

Thanks man!

[@ImranKhan-ev8wo]

what are the indications of too lean or too rich mixture? and how can i know without seeing spark plug

[@thejunkman]

Generally speaking. LEAN the engine will cut in and out, bog on acceleration, overheat, run better with the choke or enrichment engaged. RICH then engine will bog, be sluggish, black or sooty exhaust, run worse with the choke or enrichment engaged.

[@trentonc9141]

Great video! It's very helpful. Can you tell why some jetting kits are just first stage and some are three stages and in what conditions would the 3 different stages be used for? I'm presently riding a 04 drz400s but will be doing a 3x3 mod. Eventually I will install a performance pipe. That's also why I'm wondering if I need the other stages. Thanks

[@thejunkman]

Stages are levels of modifications. The modifications you describe are "stage 1" meaning you aren't doing anything to the internals or swapping any major parts, like adding a "pumper" style carb. Stage 3 would be if you installed a BBK and different camshafts. In your case you might just need to richen up the overall mixture a little.

[@elliot3147]

Nice video

[@findvoltage]

That was a good video mate. I learned how the idle works through the body of the carb after 20 years of repairs 😂

[@ACommenterOnYouTube]

thats sad .. This is WHY i do my OWN mechanic work ... Because i can't trust people like YOU to work on my carburetor that don't even know how it works ...

[@AAPEngineer]

Why the pilot jet stops its function when the carburetor slide is certainly up ? Is it a flow-pression-area effect?

[@nicholaspanidis9722]

so 50mm bore 55 mm stroke with 10.9.1 compression will need how much air and how much richening on the carburator that is 20mm fuel side and 32mm air inlet?is there an actual solution?

[@masterofbikes2747]

Good job

[@jimmyjohnson1452]

Great video.I have a cv40 and at idle I have some fuel coming out where needle goes into emulsion tube.Is that normal?

[@thejunkman]

I am not sure what you mean? Is this when it is running?

[@jimmyjohnson1452]

@@thejunkman yes.When I am at idle there is some fuel coming up through the jet needle .Then runs under the butterfly into the manifold.

[@AuMechanic]

Nice demo, problem is knowing a little about carbies is often worse then knowing nothing. Ive just done a series covering how carbies really work, mostly its the stuff mechanics all should know but often don't which is why carb tuning is a dying art..

[@thejunkman]

I skimmed through your videos and didn't see any carb videos.

[@deangelesduffie3037]

thejunkman can you tell me why my bike bogs out in 4th gear at Full Throttle but not at half throttle but in Full Throttle 4th gear it starts to bog but if I let off the throttle and just have it halfway it runs fine is it not getting enough fuel?

[@thejunkman]

+DeAngeles Duffie yep, your running lean at WOT. The video will tell you what adjustments to try.

[@deangelesduffie3037]

thejunkman thank you sooooooo much you definitely make a big difference and you explain very well how to do these things thank you very much sir. and I will be back with more questions as I have them so just remember my name I build super pocket bike drag bikes so this information was very well needed thank you.

[@williampickman3861]

Great video..very informative

[@thejunkman]

Thanks.

[@vainparasite]

Awesome video

[@Mrjimmybuckets24]

Very informative. I didn't know shit before this video, but now I feel like one of the pros!

[@juntjoonunya9216]

4:12 idle mixture screw is doing nothing? why not and where is it within these blue and green lines which have been helpful so far

[@thejunkman]

You are correct the idle mixture screw is doing nothing, because the throttle is not in the idle position and the pressure has changed so no vacuum is allowing it to pull fuel from that passageway.

[@3421PARIS]

awesome video

[@masonblake3289]

If I were to take my spark arrester out of my exhaust would I need to change the pilet jet, main jet, and needle size?

[@thejunkman]

No

[@CBRRR-eh3ky]

Nice vid. Question to the pro. 1- what happens if the choke (flap valve) is removed? Does that mean that the engine will run leaner since it controls air? 2- can the main jet needle be adjusted? If yes what are the basics? 3- how to know my main jet needle position? Issue: i have a bogging at high range acceleration. Low and mid ranges are awesome. At high range, bike hesitates; i heard a gun shot out of my exhaust opening my throttle in this range a few days ago. My main jet size is 168. 2000 XR600R. Cobra exhaust, KNN Air filter, no air choke valve, keihein stock carburetor Anybody read this and can assist thanks in advance

[@clownmotopecas2076]

What makes the idle jet stop feeding the mixture when the slide opens wide?

[@thejunkman]

Because the fuel starts flowing through the main jet lowering the level in the bowl so the pilot jet is no longer submerged games under the fuel level. I am working on a series of videos with animations that will show this even better so subscribe and stay tuned.

[@ACommenterOnYouTube]

@clown engineharia: DUDE ... Did you NOT watch this video..?? HE fucking explained it ...

[@tonza3086]

Anyone know what i have to change on my 26mm molkt on a lifan 125 to get rid of bogging? I have tried from 100 to 122 main jets (102 is the stock one) and nothing is helping, i have also tried 10 sizes bigger pilot jet, im not sure if it helped, but maybe it did a little. I tried a cloth around the air cleaner that removed the bog but it doesnt work well with it on. So do I have to get bigger or smaller main jets and/or pilot jets? I appreciate if someone could help

[@icedjax]

nice tutorial bud helpful :)

[@danielcardenas9924]

I have a pilot jet problem wont idle sometimes do i need a smaller or bigger pilot jet?

[@thejunkman]

Well first determine if your current pilot jet is even functioning, ie. is it clear and clean, this means removing it and checking. If so go here to learn how to properly adjust the idle speed mixture www.thejunkmanadv.com/how-to-idle-mixture-screw-adjustment.html It will tell you what to look for to determine if you need a larger or smaller jet. I can't really determine that over the internet very easily. There is a cause and effect with rich and lean, my website and other videos can help you learn what to look for.

[@ghostp7919]

Hi man... I just put a new crankshaft an cylinder an head on my honda mtx 80 ot it's a 115cc Ø57mm ATHENA RACING big bore kit an it's starts an runs but there petrol pissing out of the overflow pipe ? What's go in on here ? It's a 18mm carb on it

[@thejunkman]

That is easy. Check this out. kzbin.info/www/bejne/n2fcgJdoodyqerc This will explain your problem.

[@genaminin]

Thank you! Great!

[@princecharlesthethirst]

so if i need more air and less fuel in the mid range, what jet do i need to adjust?

[@thejunkman]

I would adjust the jet needle's clip position first. That will fine tune the flow through the main jet. If you can't dial it in doing that then it is time to change the main jet and then do that again. This video explains all this if you watch through that section.

[@princecharlesthethirst]

@@thejunkman I just had a hard time wrapping my head around it, Thankyou for the advice, I will see what I can I do

[@johnrobinson1206]

need help I have a 125cc pitbike 4 speed motor with a 26mm mikuni carb starts and idols does somewhat ok in first gear and sometimes in second 3rd gear it just bogs out I can't get it to open up any advice has performance exhaust and air filter air screw is adjusted one and a half turns out thanks for the time nice video

[@thejunkman]

You are possibly too lean on the main jet or rhe needle position. Watch the video again and focus on those. Also I have other videos that break it down a little more. It takes testing one thing at a time. kzbin.info/www/bejne/lZireWeLi8eefKM

[@johnrobinson1206]

thanks got it right thanks for the help

[@ismaeltorres4978]

How do you know what size carb to use?

[@exxicom]

Super Cool Video !!!

[@MayurPanghaal]

Out here, in INdia, people and mechanics actually think that messing with the air screw will somehow affect the fuel economy !! They have no idea of this.

[@gogurt_st]

If I lower the pilot jet into the bowl a little more, would that resolve the sputtering when I roll off the throttle?

[@thejunkman]

That is not possible. The jets have a fixed position. You could raise the float height, but the solution might be to richen the pilot jet to the next size.

[@thejunkman]

kzbin.info/www/bejne/iZzSfnaGbralm7M This video of mine might help you understand what settings to change a little bit better.

[@slowvag8v]

Great video!

[@ImranKhan-ev8wo]

What is the difference of ASV(air sunction valve) and ACV(air cut of valve) function in carburetor? please reply

[@thejunkman]

These are not a function of the carburetor. These are used for emissions purposes of an ASV to inject fresh air into the exhaust to complete the combustion/conversion process of the carbon monoxide. ACV is used in the same way but to reduce the popping on deacceleration by completing the combustion.

[@iRafaelkr]

I've heard from someone that you should do the carb jetting when you change the exhaust on your motorcycle, may have something to do with the air flow. Is it really a "must do"? Might be a really self-explanatory question but, as you can probably tell, I don't have that much experience with motorcycles If anybody could help me with that, I would be very grateful

[@quadbrothers5801]

With an aftermarket exhaust you allow more air to escape. This leaves room for more air coming in. You should get an aftermarket intake and re jet it. Your gonna need more fuel not less.

[@quadbrothers5801]

If you do so you will increase the power and longevity of your engine.

[@Charlie-Cat.]

I have a two barrel Weber carburetor that is having a problem in my car. When I do a cold start with my car it seems like it takes off like a rocket. But after it warms up, and drive it around for a little it, the idling goes back to normal. When I open up the air cover when it's dead cold the motor, the jets are wide open. I mean really open all the way. When I try to touch them. they don't even move. What do you think I should do now? I have a rebuilt carburetor in my pad, but would like an opinion on what you think.

[@thejunkman]

Dose the throttle shaft have play in it? This can ne a source of a vacuum leak.

[@rikashaw4815]

Great vid, ive got a good understanding now, wow

[@thejunkman]

Glad you liked it. That is why I made the video.