How carb jetting works | Offroad Engineered

[@ryanshout8652]

How do we know if the engine is runnning rich or lean? what about a lotta rich or a little rich and vice versa?

[@StepstoPodium]

That's something that can only be understood with experience. Meaning that you actually have to start messing with the carb to understand what it means a rich or lean mixture. One great way to get a good base on that is to change the needle's circlip position to its extremes. That way you will be able to feel what is a rich or lean mid throttle response and translate that feeling to idle and full throttle. But nothing replaces getting your hands dirty and trying out :) With carbs it's a little more dificult to understand these feeling than with suspensions because you don't feel it in your hands (quite literally) but you feel it in the engine's performance. A lotta rich will for sure get you foul plugs and too lean will make your engine heat up rather quickly! Hope it helped 💪

[@ryanshout8652]

@@StepstoPodium Awesome thank you! I ride an older 4 stroke, 2010 yz250f, so it's part of the pre-EFI era and carb tuning is part of my maintenance. I have taken it apart, cleaned it, thrown in a JD Jetting kit that worked well. Then I had a buddy loop out (he's ok, so it was funny...) which bent up the stock muffler so I replaced it with an aftermarket pipe. Now I need to tune the carb a little... this info will help!

[@StepstoPodium]

Let me know how it turned out! I would love to hear your findings and how the video helped you tuning it 😁💪

[@اشرفالبكري-ط7خ]

@@StepstoPodium آ

[@akhileshkumargajendra2661]

If top of Spark plug (sparking area) is clear and white it is lean . If spark plug has carbon black carbon layer on top it means rich mixture.

[@Whammo77]

I think I just learned more about a motorcycle carburetor in 6 minutes than I have in the past 40 years. Thank you!!!

[@StepstoPodium]

❤️❤️🙌🙏

[@neildxb]

This is the clearest explanation I have found for how carb jetting works! The graphics are a huge help. Thanks!

[@StepstoPodium]

Glad it helped! Thank you for watching 🙌

[@hardwaylearner]

best carburetor video on the internet

[@StepstoPodium]

Thank yoouuuuu 🙌

[@mikegentile13]

I agree. This explained sooo much!!

[@csselement]

This is, by far, the best carb info video on KZbin (based on my research). Thanks, it was very helpful. What an amazing piece of engineering.

[@StepstoPodium]

Thank you very much! Hopefuly it remains so despite your ongoing research 😆 True indeed 👌

[@greyzoneofficial]

I would have to agree! Thanks!

[@greggfuller2220]

Absolutely genius by having the graphics. In jet pilot School they use graphics similar to this to explain jet engine blows and the operational systems of the jet. The carburetor video is well above any class I've ever taken. Keep up the excellent work, good sir!!

[@StepstoPodium]

Thank you so much Gregg! 🙌🙏

[@akhileshkumargajendra2661]

If Spark plug is clear and white it is lean . If spark plug has carbon black carbon on top it means rich mixture.

[@robhayter484]

No shit

[@DavidPerez-ci6qi]

Thanks I didnt know that unlike the guy above. If only someone had said that to him every time he learned something new..what a jackazz

[@robhayter484]

My 5 year old niece would have known that

[@DavidPerez-ci6qi]

@@robhayter484 I bet. A real born know it all says the jacksazz

[@robhayter484]

@@DavidPerez-ci6qi melt

[@chandudammalapati2726]

Dude your video is one of the best that explains how a carb works.. You literally killed explanation... I don't know If I am going to rejet my carb, but your video really helped to fix my carb..

[@StepstoPodium]

Thank youu!! Really glad to hear

[@joliver81]

Having the graphic to assist explaining how are carb works was very effective. This may be one the best carb videos online. Would love to see another related to float bowls and there method of operation. 👍good job.

[@StepstoPodium]

Thank you! Glad it helped! 😄🙌

[@ultimateearrapechannel31]

for everyone who wants to know: a lean engine will be more silent and gives a slight delay at low throttle. so you pull throttle, and a second later your engine responds. a rich engine will have quick throttle response but gives bogging (on a 2stroke it is called 4stroking), so the engine makes a faster and louder sound, but the power decreases when its doing that.

[@jessejules2092]

Thank you

[@adeel.designer]

great !!

[@hhstarwars]

Why is it called 4 stroking? How does the engine being rich or lean in a 2-stroke change the crankshaft rotations? 😂

[@SammyFiggs]

How do I fix it. It’s happening to me

[@hungkhan]

​​@@SammyFiggsif rich lower the clip position until you the problem is gone, for the clean condition raise the clip

[@ziggy682]

The animated diagrams in the video are top notch. Even though i knew how the various circuits worked, it was helpful to see the visuals to really make everything click. Great job!

[@matthewryan2048]

Loved it, A good base line explanation without getting too technical. Keep up the good work.

[@StepstoPodium]

Thank you! 🙌🙌 new videos are coming out at the end of the month 😁

[@DJ_suzxki666_]

You made carbs looks like a simple device XD Thanks a lot :)

[@StepstoPodium]

Ah ah! Thank you for watching 😄💪

[@danijuggernaut]

I´m not a beginner but i tell you this is the best video on YT for jet adjustement. See i power up my little 50cc two stroke to 75cc and i´m preparing well my first start. So people may thing on the first start you have to be cautious with too much rpm, but thats not true. Throttle up a two stroke means lubrication and thats what the engine needs at the first start with new cylinder and piston. But if you start up lean it can bring catastrofic consequences. So this video gave me the tutorial i needed. I adjust first needel to warm up the engine. To warm up we apply certainly one to three quarter throttle, so for that the needle is responsable and has to be the first adjustement. When this is ok i go for the idle by adjudting the air screw and jetting if necessary. The main jet will be adjusted on a longer ride with fully open throttle. Ohhh man, i got a plan, lol. Thanks a lot, greetings from Spain.

[@StepstoPodium]

Thaaank you Dani 🙌🙏

[@freedomforourfallen3755]

I’ve worked on carbs forever. This is a real good tool. I know to change things. So now I exactly what I’m looking at

[@StepstoPodium]

Glad it helped! 😄🙌

[@hotchihuahua1546]

The number one reason customers came to my shop . A clogged pilot jet on a carbureted bike . First indicator ! If you need to partially run your choke once the bike starts and it won’t idle well with the choke off . Do that enough and you eventually foul your plugs . Know the first signs !

[@ryanmurphy9201]

This is by far the best video understanding the carburetor. Thank you so much I will be following you from this point on.

[@StepstoPodium]

Thank you! Glad I could help! 🙌😄

[@paivma8820]

Да, отличный видос получился! Однозначно лайк и подписка. Ваш фолловер 😂)))❤😊

[@nigel2447]

Another great video. I am surprised by some of the negative comments. I just recently got back into bikes and two strokes. You gave an excellent foundational video. You are correct in saying it is time to go get your hands dirty, and I am sure guys can go do additional homework on tuning, plug reading, other means of figuring out how to dial in the carb. Also, being able to take feedback from the machine is critical.

[@StepstoPodium]

Thank you Nigel! True indeed 👌

[@pauloguevara8646]

Congratulations for sharing this king of valuable content, this contributes to make the world become a well educated place

[@StepstoPodium]

Thank yooouuu 😄🙌

[@bansalartsagra3981]

one of the finest videos ever on the subject.

[@StepstoPodium]

🙌🙏🙏

[@derekrebel3384]

This really is a great video. All the info without overcomplicating things. Thanks.

[@StepstoPodium]

Thank you the kind words and for watching! 🙌💪

[@philatwood2086]

Excellent video with clear descriptions and explanations... Yes.. you video is worth 10,000 pictures.. Thanks..

[@StepstoPodium]

Thaaaaank you so much! 🙌😊

[@DIYWilly]

Great video! Straight to the point and really cleared up the questions I’ve always had for proper carb tuning. Graphics helped a lot!! 👍 Thanks for sharing!!

[@StepstoPodium]

Awesome! Super glad I could help! 😄🙌

[@jonathanredman8497]

Excellent video with easy to understand graphics. Thanks for posting.

[@StepstoPodium]

Thank you for watching!,🙌

[@uniquecattlefarm6146]

Well explained and very informative video with graphics to understand better. I hope you make another video for the best setting to get higher fuel average.

[@AntiStressKit]

Luis, thank you for continuously and consistently providing quality content. It is time to stock up on jet needles :-)

[@StepstoPodium]

I thank you for never skiping a video! 🙌 Stock up and have fun 😁👌

[@Camdouin]

That makes everything much clearer. Thanks

[@FarRightRider]

Best carb video I've seen on here, thank you, sir!

[@StepstoPodium]

Thank you so much Stan! 💪🙏 you have a bunch of other videos jjst as good 😄

[@mjl8115]

This is the most niche YT channel I've subscribed. I love your videos. And this is another great content. Keep on doing yours Steps to Podium, Luis. Cheers from Poland.

[@StepstoPodium]

Thank you so much! I really appreciate it M J L! 🙌🙌💪

[@OFFroadOFFcourse]

Oooh, I hadn't seen this one! Brilliant as always! I learned soooo much, man!

[@StepstoPodium]

Just came out, don't worry 😁 thank you for watching and I'm glad you learned something 🙌

[@ironDsteele]

Thanks for the explanation. Tuning the RZ500 is still a pain in the ass.

[@traceprior2193]

You did a fantastic job on this video. Very well done

[@marcelsteinhauer4377]

Super easy explained and so clear after this video thx!

[@Jp11130]

Best video on how carb. Works Thanks

[@StepstoPodium]

Thank you!! 🙌🙌

[@JO3BID3N-is-a-P3D0]

thanks for the vid! now ill be able to jet my 2024 pgm-fi Honda!

[@simony5807]

Very helpful in visualizing and assessing my problem with adjusting my new nibbi carburetor. Thank you

[@StepstoPodium]

Glad I could help!

[@AlexanderAfeldt]

Это первое видео где я смог проследить взаимосвязь между режимами, спасибо графикам. Я уже долгое время пытаюсь найти хорошую информацию по настройке карбюратора для своего VMAX 1200, все остальные видео представляет из себя в основном "бла бла бла". Спасибо большое. Если будет возможность хотелось бы видеть виддео подобного же плана, но уже с реальным мотоциклом и реальными настройками (желательно 4х цилиндровый). Что-бы можно было более четко проследить логику подбора. К сожалению не у всех есть под рукой стенд для точных измерений.

[@topstar3]

Yet another brilliant video! Great work my man!

[@StepstoPodium]

Thank you!🙏 I'm glad you liked it! 💪💪 onto the next one 😁

[@m4nzss3]

Thank you. Your video really help.

[@NirHason]

I didn't watch it but I'm sure it's going to be gold.

[@StepstoPodium]

Thank you for that trust! 🙏🙏🙌🙌

[@AntiStressKit]

Nir, I watched the video and can confirm - it is pure gold

[@StepstoPodium]

🙏🙏🙌🙌 thank you Ariel! I really appreciate 💪 onto the next one!

[@MuhammadAli-vd7xz]

Thank You for this video, informative

[@akhileshkumargajendra2661]

You can adjust carburetor niddle up and down. It will give rich or lean mixture depend on niddle and fuel mixture screw. Niddle setting gives best acceleration response.

[@RwP223]

Heck yeah, needle is a big deal

[@ArcanoDCUO]

Mine is always bogging if i pull to fast... i tried everything...

[@niconine268]

Great explanation, illustrations & summary

[@StepstoPodium]

Thank yooouu 🙌🙂

[@hellstrike007]

Good video. Really easy to digest too! Thank you for sharing your knowledge.

[@StepstoPodium]

Thank you for watching 🙂 there's a lot more on the channel eheh 😁

[@osimnod]

Excellent video and the graphics really helped clarify what was happening and when. Question: is there a practical way to test this without fully installing the carburetor into the boots? I suspect not.

[@track1219]

Good video! Also a float level set too high will make engine run rich.

[@Riofitro]

The way to set it is to look at the color of the spark plug after the motorbike engine is running... if it's wet or black it means it's wasteful, if it's dry it means it's economical.

[@rroz4762]

Great tutorial ! I have been trying to tune my carb for awhile , 1985 XL 350 , installed a Mikuni carb and mid and top end , after some rejetting are doing well , my issue is with the zero to 1/4 throttle , when riding it fluctuates too much , constant variation up amd down , choppy i guess might be the term , thoughts ?

[@therealrealshocker]

Excellent video! Thanks for sharing! 🙏

[@nunogens]

Great explanation! 💪

[@StepstoPodium]

thank you for watching Nuno!!

[@shireproductions9499]

Great video. Thanks for the quality explanation

[@StepstoPodium]

Thank you for watching 😄🙌

[@xt225]

Great video. Would have been perfect if went through the air/fuel mixture.

[@JosiahNielsen]

This video helped me so much thank you😊

[@StepstoPodium]

Thank you for watching Josia! 🙌

[@vancezx11]

Very well explained.

[@freashtoast1684]

Legit exacly what I was looking for at 3am

[@Slater-rh1qr]

Great video

[@karlitosmanbur9153]

Thanks.... Easy way to understand

[@StepstoPodium]

Thank you for watching 💪

[@voyteks4668]

correct me if Im wrong,,, the pilot jet supplies fuel all the time. not only when the throttle is closed or partially opened. so the pilot jet can be used for very fine/final tuning.

[@anandblore10]

I have installed bigger pilot jet and needle lowered to 2nd position but there is light sputtering apart from that performance is very good. So due to sputtering I lowered needle to 1st position and sputtering stoped but less power in middle throttle position.should I change the larger main jet to gain more power or the larger needle to be installed with the circlip positioned to 2nd or 3rd depending on the performance Thanks

[@medardocalumpag4108]

Thank you Sir

[@Theferg1]

Great examples and video and info!! I'm definitely a new sub!!

[@StepstoPodium]

Thank you!! 🙌🙂

[@billmago7991]

If using an Amal concentric, the needle jet wears, probably on other brands too

[@ericbenavidez992]

Best explanation 💯 Question: have a straight piped Honda shadow 1100 that hasn’t be rejeted and I’m in the process of it. How should I rejet it? In idle it’s to boggy and when I’m in mid rpm’s I have to give it more throttle

[@ville5152]

higher the needle!

[@Garage-gs5ch]

Mais um vez um excelente vídeo, com excelentes animações. Não esquecer também a afinação da boia 😉

[@StepstoPodium]

Muito obrigado! 🙌 é verdade, mas isso é uma afinação de manutenção e não de desempenho, que era o que queria incidir neste video 😉💪

[@endivas]

Mais um excelente video! Parabens e obrigado pela partilha!

[@StepstoPodium]

Obrigado eu por veres! 🙌

[@RidingwithEthan]

Great video thanks for the easy explanatio ❤

[@StepstoPodium]

Glad I could help 🙂

[@motoric5188]

Excellent video! 👌

[@StepstoPodium]

Thank you!!-🙌🙌

[@riadhch5643]

Thank you my friend have my best regards from Algeria the video is very specific and useful

[@StepstoPodium]

Glad to know and thank you for watching! 😄🙌

[@Dropsix]

Great video, thank you very much!

[@StepstoPodium]

Thank you for watching! 🙌

[@Steveman61]

Great video Luis, just one thing the needle jet is mounted into the jet block, not the slide ;-)

[@StepstoPodium]

Fair enough steve 😅😂

[@stanbeattie3958]

Very good video

[@2bit2strokes38]

Look at your spark plug if the tip is white or gray then it's too lean and you need to up the Jetter raise the needle and if it's black and oily then it's clearly too rich and it's choking out the motor

[@HugoJimenez-h8k]

Carburetor is gushing gas for one of the bottom hose from inside the

[@mallutek3644]

So fuel screw only effect at quarter of the throttle response

[@mattmesi]

What if the carb has that chocolate tan color it needs to be ; with a slight white chalky tip?

[@coyoteserranoband]

Are both jets supposed to work at the same time? For a 2 bbl? Or is one a idle jet and the other a main jet.

[@sincityenduro4111]

Very good video, helpful 👍

[@StepstoPodium]

Thank you for watching! 🙌

[@greiner7414]

Great visual thank you!!!!! How about a O2 sensor for measuring air/fuel mixture as a tool?

[@StepstoPodium]

Thank you for watching! 🙌 It can be used, for sure 💪

[@momentsoftriumph1050]

What a fantastic, clear video. Am new to this and looking to help iron out some running issues with 4stroke 50cc gy6 ped. Issues being slow to pull away from standing, can almost die. Also some bogging at full throttle. Also generally slow. First I'll just do a carb clean. I'll then see how it runs. Depending on how it runs.... Is the first thing to alter is the needle size? Or does it not matter, but only change one thing at once? Thanks!!

[@nn-js4yg]

Thank you

[@guywy8310]

great video

[@Postalguy1]

My needle jet doesn’t have circlips

[@sinner7947]

Can you make a video explaining flooding and how to fix?

[@StepstoPodium]

I really appreciate the suggestion, but I tend to make videos explaining how things work, not specifically what happens when things don't work 😅

[@jamiestanley8774]

Will this explanition work for a road bike 4cylinder.

[@gavinnance4475]

certainly

[@marcellogarcia]

Very good 🇧🇷👍🏻

[@StepstoPodium]

Thank you Marcello! 🙌🙌💪

[@chrisstokley7687]

awesome video

[@StepstoPodium]

Thank yoouuu 🙌🙏

[@docteroperation]

Hugely helpful. Thank you for sharing this knowledge.

[@StepstoPodium]

Glad I could help! 🙌

[@edza_lol]

I have problem I can start my bike and its runs but when I give full thotrle it stops runing what I need to change ignition is good I can't understand the mixture is lean or rich help me pls.

[@gavinnance4475]

im sad to see no one has extended their knowledge to help you. assuming you have cleaned your carb and what you say is true, i can infer that your bike is running too rich!

[@Wesley..]

Hi Thanks for the video! I have a problem with a hanging idle. When i start the bike it just runs normal but when i give it a hand of throttle the rmp stays high and wont drop. When i pull the choke out and right after i put it back in it lowers down to the desired rpm. When i ride slow technical stuff and pull the clutch the rpm rises again and only drops when i let the clutch out. What do you think the problem is? i ride a crf250x

[@StepstoPodium]

Seems to lean to me!

[@gavinnance4475]

im in the process of tuning my carbs, currently can only get the bike to run on starter fluid and if i give 1/8 throttle to maintain engine power. i had my air/fuel mixture screw too far up blocking the fuel and it was running lean, currently it is running too rich but in both instances the engine will not idle. the bike ran and idled before i cleaned the carburetors. from this video i can concur… hold on let me watch the video again.

[@gavinnance4475]

yea nope still confused.. on my 5th watch

[@tomek860]

What if my Mikuni BS 34 does not have a circlip on the jet needle? It sems to be fixed, non adjustable.

[@JamesMcGraw-ph1el]

What should i do if im starting to bog a little at full throttle but when i play with the choke the bike picks up again

[@markhodgkinson151]

Honda XR400R done 4000km and was getting difficult to start Once started it would only run on half choke. So I bought a rebuild carb kit with all the needles and rubber rings. Hex Main Jet - #140 Slow Jet - #52 Jet Needle - D625 Fitment: Fit for Honda XR400R 1998-2004 Cleaned that carb like a new pin. Fitted the new parts. Paid attention to the original screw settings. Starts easily no choke. Open it up it dies. Put half choke on it just about let’s you open the throttle but doesn’t like it. Put full choke on and can open the throttle and drive about easily. What have I done wrong and what do I need to do?

[@Johnny_OSG]

Ohh, that part about needle jet & needle combo was good. I have problem that I raised the needle a lot and my afr is still to lean in the mids. Does that confirm that I need new bigger needle jet and needle? I'm running zzr1100 carbs on bmw m10b18 engine so there is little info on tuning from scratch

[@StepstoPodium]

Probably!

[@OhwojeheriSpencer]

Hi the problem remain this after service of the carburator

[@kings17court]

My 4-stroke bike starts pretty good cold. Sometimes 1st kick. But when it warm, it's hard to start, and it starts most reliably with half choke. What does that sound like to you? I'm thinking maybe the main jet is a little to big, or a little too small?

[@Billy_the_Wolf]

Bigger main jet or tight needle jet ?? 🤔 Please help i have a ZX6R 2002 runs good in idle but it need more gas in mid and high throttle

[@mimrans41]

Hi great movie,when my bike cold and even warm it sound stable,when it get hotter the idle rpm get upper and not stable.what do you think should I do?

[@Chris-uh3cm]

This is great theory but how do you know what lean or rich is?

[@StepstoPodium]

Hands-on!

[@r_s_enduro]

What about thickness on needle for hot weather? Hot and dry.