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 💪
@@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!
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!!
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.
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.
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..
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.
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!
Holy crap this video is one of the best diagrams for the FCR carb. Its crazy how hard it is finding info on these machines haha, great video man seriously
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.
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.
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 ?
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!!
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.
Thank you very well done I actually understood for the first time what to do and for the first time I actually took time to like and subscribe at all time. you have made a difference in this old man life or the children thank you so much thank you thank you thank you what you do very well done
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
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.
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.
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 !
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
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
Great explanation of how everything works! Im having an issue, its a 2 stroke 490, feels good but when it gets warm/hot, the idle goes up and sounds like lean. I`ve heard those old YZ490 were impossible to jet right. Any suggestions? I live 3200 ft above sea level, just in case :) Thank you
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
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.
Hey Thanks for the video 👍🏻 My bike seem to have a delay in dropping the rpm after I let go of the throttle while riding , Is that too lean or too rich mixture? It also seem to overheat a bit
very nice video but i have some questions i bought new VM36-4 mikuni for my sr400 do i need to change the needle or anything? and do i even have to touch it? i pre-tuned the air way by 2.5 and left the idle screw
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!!
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.
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!
Great video thanks. Just a question if that's OK. When travelling down hill on my 2 stroke Beta Xtrainer 300 with the throttle fully closed I get a lot of surges, so much so I often pull the clutch in. What's the cause of this. Many thanks Chris
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?
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.
So should i start with pilot jet to stop black spark plug and white smoke.. i already dropped the needle as far as it can go. But i still got white smoke and black spark plugs while just running the bike in idle for just a few minutes
I have a 2002 blaster and I took off the air box lid and I was told to re-jet my carburetor my main jet is stock when I re-jet do I go up in size or down in size
Hi my bike original pilot & main size = 36 / 82 and engine will still running even if I turn the pilot all in so is that mean I need to up my pilot size ?? Thanks
So ... On a car we have an 02 sensor or wideband O2 sensor to monitor its af mixture, HOW do you know how lean or rich it is on a motorcycle to know if you need a smaller or bigger jet or needle ??
I need help diagnosing what apparently looks like an air leak or fuel delivery issue. My 260cc scooter starts and idles fine, but stalls upon little throttle. If I restrict 75% of air flow at the intake the scooter throttles fine. Spraying starter fluid or carb cleaner at the manifold shows no difference in motor rpm. Thank you. Float and valve clearance are at spec, new slide diagram, new gas, new filter. All jets are clean.
Found the problem. There was another air pump behind the throttle cable housing that was covering this air pump. The throttle housing was installed with Red Loctite so had to use a small torch to get the two bolts loosened. The air pump was crusted with dirt and the plunger was stuck closed. Cleaned it and lubed it resolved the problem. This is a CVK30 carb.
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?
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.
So what do I do if it only gives power at full throttle and bogs otherwise it will sit and idle nicely but if I’m riding and wide open then letting off to get back on the power it will bog until the last quarter of the throttle twist
My 01 YZ250 will only bump start or push start, once it starts it sounds nice and crisp. Elevation here is about 2000 feet above sea level at least 100 degree heat. I will try leaning out my pilot jet from 175 to 165 and see what happens. What are your thoughts?
What will I do if the plug reading during mid throttle is blackish with some brown but the reading in full throttle isn't? It's somewhere between "not black but not white too but it isn't brown."
@@StepstoPodium would changing to bigger pilot jet help fix the lean condition during full throttle? I forgot to mention that the mixture screw is already at 4 full turns, more or less
@byaheniVan maybe we should schedule a technical session to go over that in more detail! 🙂 Trying to fix something through comments is not easy 😅 stepstopodium.com/technical-sessions/
@@StepstoPodium im new to tuning carb. i just got a used bike few days ago. i thought only the fuel screw needs to be adjusted when adjusting the idle speed as the more/less fuel will determine the idle rpm. idk what im saying
I would like to know how main air jet is affecting everything since DynoJet performance -guys usually likes to block the whole main air jet and they say there will be more power by doing so.
![How To Tell If Pilot Jet Is Rich or Lean [Jetting Symptoms]](http://i.ytimg.com/vi/dzFzWIZsuDg/mqdefault.jpg)
How do we know if the engine is runnning rich or lean? what about a lotta rich or a little rich and vice versa?
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 💪
@@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!
Let me know how it turned out! I would love to hear your findings and how the video helped you tuning it 😁💪
@@StepstoPodium آ
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.
I think I just learned more about a motorcycle carburetor in 6 minutes than I have in the past 40 years. Thank you!!!
❤️❤️🙌🙏
This is, by far, the best carb info video on TH-cam (based on my research). Thanks, it was very helpful. What an amazing piece of engineering.
Thank you very much! Hopefuly it remains so despite your ongoing research 😆
True indeed 👌
I would have to agree! Thanks!
This is the clearest explanation I have found for how carb jetting works! The graphics are a huge help. Thanks!
Glad it helped! Thank you for watching 🙌
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!!
Thank you so much Gregg! 🙌🙏
If Spark plug is clear and white it is lean . If spark plug has carbon black carbon on top it means rich mixture.
No shit
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
My 5 year old niece would have known that
@@robhayter484 I bet. A real born know it all says the jacksazz
@@DavidPerez-ci6qi melt
best carburetor video on the internet
Thank yoouuuuu 🙌
I agree. This explained sooo much!!
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.
Thank you
great !!
Why is it called 4 stroking? How does the engine being rich or lean in a 2-stroke change the crankshaft rotations? 😂
How do I fix it. It’s happening to me
@@SammyFiggsif rich lower the clip position until you the problem is gone, for the clean condition raise the clip
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
Glad it helped! 😄🙌
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.
Thank you! Glad it helped! 😄🙌
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..
Thank youu!! Really glad to hear
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.
Thaaank you Dani 🙌🙏
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!
Loved it, A good base line explanation without getting too technical. Keep up the good work.
Thank you! 🙌🙌 new videos are coming out at the end of the month 😁
Holy crap this video is one of the best diagrams for the FCR carb. Its crazy how hard it is finding info on these machines haha, great video man seriously
This is by far the best video understanding the carburetor. Thank you so much I will be following you from this point on.
Thank you! Glad I could help! 🙌😄
Да, отличный видос получился! Однозначно лайк и подписка. Ваш фолловер 😂)))❤😊
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.
Thank you Nigel! True indeed 👌
You made carbs looks like a simple device XD Thanks a lot :)
Ah ah! Thank you for watching 😄💪
This really is a great video. All the info without overcomplicating things. Thanks.
Thank you the kind words and for watching! 🙌💪
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.
Thank you so much! I really appreciate it M J L! 🙌🙌💪
Excellent video with easy to understand graphics. Thanks for posting.
Thank you for watching!,🙌
Congratulations for sharing this king of valuable content, this contributes to make the world become a well educated place
Thank yooouuu 😄🙌
Excellent video with clear descriptions and explanations... Yes.. you video is worth 10,000 pictures.. Thanks..
Thaaaaank you so much! 🙌😊
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 ?
one of the finest videos ever on the subject.
🙌🙏🙏
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!!
Awesome! Super glad I could help! 😄🙌
Best carb video I've seen on here, thank you, sir!
Thank you so much Stan! 💪🙏 you have a bunch of other videos jjst as good 😄
Luis, thank you for continuously and consistently providing quality content.
It is time to stock up on jet needles :-)
I thank you for never skiping a video! 🙌
Stock up and have fun 😁👌
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.
Heck yeah, needle is a big deal
Mine is always bogging if i pull to fast... i tried everything...
You did a fantastic job on this video. Very well done
Thank you very well done I actually understood for the first time what to do and for the first time I actually took time to like and subscribe at all time. you have made a difference in this old man life or the children thank you so much thank you thank you thank you what you do very well done
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
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.
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.
Will this explanition work for a road bike
4cylinder.
certainly
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 !
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
higher the needle!
Super easy explained and so clear after this video thx!
Good video! Also a float level set too high will make engine run rich.
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
Probably!
That makes everything much clearer. Thanks
Great explanation of how everything works! Im having an issue, its a 2 stroke 490, feels good but when it gets warm/hot, the idle goes up and sounds like lean. I`ve heard those old YZ490 were impossible to jet right. Any suggestions? I live 3200 ft above sea level, just in case :) Thank you
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
Seems to lean to me!
Good video. Really easy to digest too! Thank you for sharing your knowledge.
Thank you for watching 🙂 there's a lot more on the channel eheh 😁
Excellent explanation and diagrams.
Thank yooouuuu
Great explanation, illustrations & summary
Thank yooouu 🙌🙂
Yet another brilliant video! Great work my man!
Thank you!🙏 I'm glad you liked it! 💪💪 onto the next one 😁
Great visual thank you!!!!!
How about a O2 sensor for measuring air/fuel mixture as a tool?
Thank you for watching! 🙌
It can be used, for sure 💪
Very helpful in visualizing and assessing my problem with adjusting my new nibbi carburetor. Thank you
Glad I could help!
Best video on how carb. Works
Thanks
Thank you!! 🙌🙌
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.
Hey
Thanks for the video 👍🏻
My bike seem to have a delay in dropping the rpm after I let go of the throttle while riding , Is that too lean or too rich mixture? It also seem to overheat a bit
Definitely lean
very nice video but i have some questions i bought new VM36-4 mikuni for my sr400 do i need to change the needle or anything? and do i even have to touch it? i pre-tuned the air way by 2.5 and left the idle screw
It depends on the behaviour of the bike 😅
@@StepstoPodium so should i just test it first without touching it?
It's a good plan!
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!!
Oooh, I hadn't seen this one! Brilliant as always! I learned soooo much, man!
Just came out, don't worry 😁 thank you for watching and I'm glad you learned something 🙌
My four stroke Yamaha 90 must be on quarter choke otherwise stalls. Would bigger jet hole help with that. Thanks for help
Thanks for the explanation. Tuning the RZ500 is still a pain in the ass.
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.
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.
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!
Really informative video. Thanks
Great video thanks. Just a question if that's OK. When travelling down hill on my 2 stroke Beta Xtrainer 300 with the throttle fully closed I get a lot of surges, so much so I often pull the clutch in. What's the cause of this. Many thanks Chris
Is the Idle jet the same as the pilot jet? just different terms?
I didn't watch it but I'm sure it's going to be gold.
Thank you for that trust! 🙏🙏🙌🙌
Nir, I watched the video and can confirm - it is pure gold
🙏🙏🙌🙌 thank you Ariel! I really appreciate 💪 onto the next one!
Super clear great job 👏 😊
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?
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.
Great video my bikes to lean on idle and when I start to ride it it bogs so does that mean just a bigger idle jet and bigger main jet ?👍😊
Should be it! 😄
So should i start with pilot jet to stop black spark plug and white smoke.. i already dropped the needle as far as it can go. But i still got white smoke and black spark plugs while just running the bike in idle for just a few minutes
Can you make a video explaining flooding and how to fix?
I really appreciate the suggestion, but I tend to make videos explaining how things work, not specifically what happens when things don't work 😅
What about thickness on needle for hot weather? Hot and dry.
Great examples and video and info!! I'm definitely a new sub!!
Thank you!! 🙌🙂
I have a 2002 blaster and I took off the air box lid and I was told to re-jet my carburetor my main jet is stock when I re-jet do I go up in size or down in size
How do you make the throttle crisp when I blip it it bogs when I rev it slowly it’s fine?
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
Hi my bike original pilot & main size = 36 / 82 and engine will still running even if I turn the pilot all in so is that mean I need to up my pilot size ?? Thanks
So ...
On a car we have an 02 sensor or wideband O2 sensor to monitor its af mixture, HOW do you know how lean or rich it is on a motorcycle to know if you need a smaller or bigger jet or needle ??
What if the carb has that chocolate tan color it needs to be ; with a slight white chalky tip?
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?
I need help diagnosing what apparently looks like an air leak or fuel delivery issue. My 260cc scooter starts and idles fine, but stalls upon little throttle. If I restrict 75% of air flow at the intake the scooter throttles fine. Spraying starter fluid or carb cleaner at the manifold shows no difference in motor rpm. Thank you. Float and valve clearance are at spec, new slide diagram, new gas, new filter. All jets are clean.
Found the problem. There was another air pump behind the throttle cable housing that was covering this air pump. The throttle housing was installed with Red Loctite so had to use a small torch to get the two bolts loosened. The air pump was crusted with dirt and the plunger was stuck closed. Cleaned it and lubed it resolved the problem. This is a CVK30 carb.
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?
Excellent tutorial.. brilliant!
So fuel screw only effect at quarter of the throttle response
Thank you. Your video really help.
Great video. Thanks for the quality explanation
Thank you for watching 😄🙌
Thank You for this video, informative
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.
So what do I do if it only gives power at full throttle and bogs otherwise it will sit and idle nicely but if I’m riding and wide open then letting off to get back on the power it will bog until the last quarter of the throttle twist
Great explanation! 💪
thank you for watching Nuno!!
Will help if i change the mainjet from 0.82 to 0.99 and the atomisor with more holes to mixt more air?
Does a bike with carburetor consume fuel while engine braking?
Yes, it does
@@StepstoPodium Then how much, Will it increases with RPM, Or Same as in Idle condition?
It depends a lot from engine to engine
My 01 YZ250 will only bump start or push start, once it starts it sounds nice and crisp. Elevation here is about 2000 feet above sea level at least 100 degree heat. I will try leaning out my pilot jet from 175 to 165 and see what happens.
What are your thoughts?
Are you using the choke?
I've heard a rumour that temperature affects this as well is that true or is it something else like moisture in air
Both!
OK have you/ can you do a video on it or is it one of thoughs things you will never really get right
It comes down to experience and trial and error! 😄
@@StepstoPodium
OK cheers
This video helped me so much
thank you😊
Thank you for watching Josia! 🙌
The bikes not picking up on low throttle fast enough what jet do I need to change bigger or smaller?
What will I do if the plug reading during mid throttle is blackish with some brown but the reading in full throttle isn't? It's somewhere between "not black but not white too but it isn't brown."
From your description it means it's getting leaner at full throttle
@@StepstoPodium would changing to bigger pilot jet help fix the lean condition during full throttle? I forgot to mention that the mixture screw is already at 4 full turns, more or less
@byaheniVan maybe we should schedule a technical session to go over that in more detail! 🙂
Trying to fix something through comments is not easy 😅
stepstopodium.com/technical-sessions/
generally does the idle screw stay all the way open all the time?
How so all the time? Once adjusted, it remains in the same position ideally. Unless you change very often the altitude for example
@@StepstoPodium im new to tuning carb. i just got a used bike few days ago. i thought only the fuel screw needs to be adjusted when adjusting the idle speed as the more/less fuel will determine the idle rpm. idk what im saying
Before turning the engine, you have to make sure the engine is in good condition. Trying to adjust a worn engine is the biggest nightmare!
What if my screw hole for the air/fuel mix is plugged with red gasket filler?
Damn
I would like to know how main air jet is affecting everything since DynoJet performance -guys usually likes to block the whole main air jet and they say there will be more power by doing so.
Can it depend on the type of carb?
What if my Mikuni BS 34 does not have a circlip on the jet needle? It sems to be fixed, non adjustable.
keihin 28mm what is ideal jettings?
keihin 28mm class A only(copy)
i use suzuki raider 150cc stock engine
thank you for your response
It depends from a lot of factors 😅 hard to tel without testing with the bike
@@StepstoPodium right now i use 110 x38 5th position needle but still not that smooth..