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How Motorcycle Carburetors work and how to tune and clean them

19962 ratings | 1729484 views
Here's a link to the kind of carb cleaner I like best (it IS the best) http://amzn.to/1rsKle5 Check out my newest carburetor video (it's even better!). → https://youtu.be/Rzec6VJQFCg Follow me on Facebook → https://www.facebook.com/briansmobile1 Follow me on Instagram → https://instagram.com/briansmobile1/ Check out and/or Donate to my favorite Charity here (or ask your boss to!) → http://www.g1dfoundation.org/ hey... awesome video..nicely explained ! just one question. Please do tel me wts AIR NEEDLE and LOW JET used for again. ? i mean how and what do they work? thanx :) Reply · The air needle is like a transitional restriction to increase vacuum pressure and tapered to prime the main jet flow gradually to ramp up fuel flow from the idle/low circuit to the main circuit. Think of the circuits like gears or stairs. The needle covers transition between 3rd gear to about 5th gear on a six speed. It overlaps basically. Fuel is getting by it from the idle/low- on through to where it's completely out of the way of the main jet and the main jet fuel flow is roaring like the straw/compressor example. Without the needle the carb would work, but not as smoothly through middle throttle (where most people ride and have the most fine input or throttle roll back and forth. The low jet is like second gear on a transmission. You can shift from 1st to 3rd, but again you risk stalling and it won't be as smooth. Also there isn't really the mechanical inertia to carry the process on like you have with a rolling vehicle with a flywheel on the engine and the wheels turning. The pistons still create vacuum every other time they go down, but air just doesn't have the punch that steel does when in motion. The circuits in a carburetor have to be there or you would have a limit on RPM range. An idle jet can't deliver enough fuel to really scream, and the main jet couldn't go slow and would be VERY hard to start because the engine would have to be spun up really fast. So you have usually four or five circuits (I want to say jets, but their physically different) that get air flow like stairs as the throttle opens. They are typically 1. Starting circuit (choke on) 2. Idle circuit 3. low jet 4. Jet Needle 5. Main jet. How Motorcycle Carburetors work and how to tune and clean them Check out my other channel here http://www.youtube.com/watch?v=1KKvwMaIotA
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Text Comments (2306)
Lee Casteel (3 days ago)
Thanks for the video but I'm still a little confused on the air needle (the screw in front the bowl) im curious on how it works and adjusting it
Bahin Goolamhossen (4 days ago)
Hi please can you help me by showing a video how to tune a ybr yamaha 125cc year2016 carburator the mixture is not in good proportion ts consumes too much fuel thank
Bob Van sand (5 days ago)
Thx mate, really gooood! Ease of talk and content is simplified.bob🇧🇪👌Belgium Europe
selvin corado (6 days ago)
I have 2005 Honda I clean carburetor but doesn’t work in high only in idle my cable for some reasons doesn’t work like before
Johnface Moto (6 days ago)
One of the best carb explanation videos out there! You've gained a new sub! I'm trying to grow my channel Johnface Moto , check it out if you get a chance, thanks!
Dude Mon (18 days ago)
Soo glad I found this. Thank you!
Junaid Simons (1 month ago)
Thank you for this vid,very informative,I never really understood how the actually carb works..👍👍
Zalien Zemei (1 month ago)
FANTASTIC video, bro. I thought i knew about carburetors but damn, you gave me more information. Thanks so much. Viewing from Arkansas.
Andrew Garcia (1 month ago)
Great video man. Thanks for explaining the principles behind the components!
angel lamberto (1 month ago)
Saved thanks best video yet Im having issues with my dr650 it has a bst40 carb on it I think one of the Jets might be clogged my symptoms are as follow doesn't turn on unless I give it gas and when I release the gas it shuts off while on and revving it's backfiring like crazy bike only has 6K miles 2018 Suzuki dr650 I dumped the gas replace spark plugs removed little filter built into carburetor and installed an inline fuel filter added seafoam and problem still exist can you give me some pointers please your videos by far the most informative I found thanks
Martin Huna (1 month ago)
Brilliant video mate. Thank you 👍
CASPER BOERMANS (1 month ago)
I love the fact that that yellow thingy knew where to go @0:57
B M R (1 month ago)
Great upload! Thank you very much for sharing your knowledge in such an articulate way.
Elliot Adderley (2 months ago)
Thanks bro really did need it
Scott Fredericks (2 months ago)
Anton Starostin (2 months ago)
Thank you for such a detailed explanation. I've seen several videos with 3D models, but seeing real carburetor with such a good explanation is completely different level!
mike eger (2 months ago)
Awesome thanks a lot!!!!!!!
TYE (3 months ago)
Lol need help with my bike. I have a Boom Vader 125cc. It's similar to a Honda grom
Nick Torres (3 months ago)
good explanation great video you make it easy to learn 👍🏼
Bob Murphy (3 months ago)
Hi - great video and very helpful. I just have an issue with my BSA C15, it starts very good and tick-over is nice and smooth but when I open up the throttle quickly it dies unless its on full choke. On full choke it revs great no matter how quickly I open the throttle. Hope you can help, oh one more thing, it is a brand new Amal monobloc 376 that I installed straight out the box. Regards Bob
Sean Dean Parsons (3 months ago)
Thank you so much! Video was great and am now a subscriber.
Kyle Woodrome (3 months ago)
Thank you for explaining in detail. my carb won’t idle , yam 50 raptor 2008. It dies before idle or revs extremely high . How important is it to have the carb boot secured while trying to get it tuned.. not fined tuned .? I’m looking for leaks but nothing? I don’t want to tear the 4wheeler apart
Kyle Woodrome (3 months ago)
The jet, I must tear down this carb 4 times a day to double check that jet.
Kevin Chen (3 months ago)
Awesome explanation. very helpful. Thank you so much.
MatthewKupid (3 months ago)
Awesome - you made this so clear. Love the circuit concept, that really helped. Thanks
Lee Simmons (3 months ago)
One of the absolute best descriptions of carb function on you tube. You are a natural teacher presenter mate! Kudos!
Roger Johnson (3 months ago)
Awesome video! Excellent job!
Ken Grimes (3 months ago)
Sir i think you just solved my grandson problem because his 125 chinese atv runs but if you try to give it gas she dies so we got some blocked jets.its been sitting for awhile due to being winter and his parents grounding and of course we dint drain the carb , duh... But ill order a new carb for 14 dollars and just to see if we can fix our problem we'll clean the old one just for tid bits and giggles to see if we can fillow instruction.i thank you sir for yor time and knowledge you are deeply appreciated
jonkwilloughby (3 months ago)
Thanks! Very helpful!!
Jimmy Greco (4 months ago)
This is Best and clear video on how a carburetor works. Thanks man
Woody Hilario (4 months ago)
Great video Brian, today I try to clean the carburetor of my Honda TMX 155, after I clean and re install in the motor, the idle is too high, its like in full throttle even I'm not touching the hand throttle. I w ill check again the parts inside if they are in good position.
Shariq Sarfraz (4 months ago)
Loved your video man! Subscribed!
AllAroundPoser (4 months ago)
Best carb video anywhere. Thanks!
Theo Valenteijn (4 months ago)
i have to choke my carb a little on my 250 rebel to get it to run good, any advice on that ?
Frack Centurion (4 months ago)
love your work
Joshua Robbins (4 months ago)
Bro.... this is probably the most informative carb video I have ran across, I've been looking for mo ths and finally understand why my bike isnt running thanks to you...lol It all makes sense now !!!!
live and let live (5 months ago)
Can someone help me with my carbs https://youtu.be/2xNO1YjNfX8 It's under a minute please!!!
live and let live (5 months ago)
I missed the part about the main jet needle what does it do?
Gary Michael Cherry (5 months ago)
Awesome. Thanks for the info!
Zaheer dalir (5 months ago)
watsupp numbar send me
SEMISANE (5 months ago)
Great job on explaining things. There's a lot of videos out there that tell you how to clean a carb and what not,but they never explain the way it actually functions. learned a lot thank you sir.
Thank you..I've been watching carburetor videos for a week and never learned anything about them.. you just told me the cure for my problem.. thank you again..
tracey potts (5 months ago)
Todd Murtha (5 months ago)
Carbs demystified! I always understood the basics but this video made it all 'click' in my head. Thank you for taking the time to make this video.
N_ R (5 months ago)
*THANK YOU* for your CLEAR, CONCISE explanation of how these contraptions work! You've DECLOAKED the mystery of carburetion! Thanks again!
Austin Killen (5 months ago)
Great video
obaidish (5 months ago)
Best of the best. Video. Sir
wayne sayer sr. (6 months ago)
I learned a lot that I previously didn't understand about carberators.  thanks
Manojkumar Viswanathan (6 months ago)
Thanks a lot dude
zachary arthur (6 months ago)
You are a legend you explained what all the party do with examples, very helpful I just cleaned out my 2009 pagsta carbie and with everything you explained it was a piece of piss... my achievements is your success mate hahaha
Chax (6 months ago)
Wondaful....i cleaned my carb two days back and my bike been good but cant idle so what can be the problem? I think dat small needle u say its for gas i didnt put good setting like u made two turns for me i have just put it..... Suggest me what to do.
Stergios B (2 months ago)
fixed it ? i have the same problem no idle
addzy boy tothill (6 months ago)
Class job.my ktm carb is playing up.now it's going to be taken out and cleaned.
David Webb (6 months ago)
Carburetor, well explained. I learned something new today. I always wonder what is the Venturi principle. Thanks bro.
Chunai143 (6 months ago)
Agree. Great video. You are a great teacher. Thanks!
Austin Birchall (6 months ago)
Damn amazing video
Johnnie Johnson (6 months ago)
Perfect !
Jack Lorence (7 months ago)
thank you!
thomas mcculloh (7 months ago)
Thanks man
Petar Petrovic (7 months ago)
Best carb video !!!! Thank you
Matt Smith (7 months ago)
That was the best carburetor video I've ever seen!
jason ricco (7 months ago)
the air jets spring fell out and he didnt see it happen then replaced the air jet without the spring
briansmobile1 (7 months ago)
Thank you!
Tiin lategaan (7 months ago)
Thank you!!!
Mike Salmon (7 months ago)
Great video. Clearly explained. Can you do a little video explaining what a PFC Cables function is. I have absolutely no idea. I think it's something to do with the air intake. Cheers
MrSpanishfly (7 months ago)
I think you have two principle at work . One is the Bernoulli’s principle , where the water gets sucked out of the straw, and the other is the Venturi effect where the air is restricted to create a fast flow.
Shabi Bajwa (7 months ago)
Love this video
JWalker (8 months ago)
Excellent TY!! I'm in need of doing this with the used bike I got.
John Thomas (8 months ago)
Thanks I learned a lot
sparc (8 months ago)
Aloy Arvo (8 months ago)
Omg thanks man!! You just answered my question!! No need to tell you now, haha.. 🙏 thank you
djmav thompson (8 months ago)
My quad bike back fires really bad i get flames out of the exhaust and carb and won’t tick over i dud get fuel coming out if the overflow as well loads of fuel so had to empty my fuel tank to stop it dose that mean my carb is faulty cheers mate im in the uk 👍
James Brady (8 months ago)
Thank you
Philip Doyle (8 months ago)
Thanks. Carburettors explained simply!👍
MoroccanAnwar (8 months ago)
Thank you
Gerson Cortes (8 months ago)
thanks dude very educational video works just well on my vt600c
briansmobile1 (8 months ago)
You're welcome!
Michael Galvin (8 months ago)
I've been cleaning my own carbs since I was a kid but this video was very helpful!
Dan M (8 months ago)
thanks for this well explained vdo
naaim small (8 months ago)
So the pilot jet is also immersed in the fuel in the bowl?
Josh (8 months ago)
Great video! Thanks for making this.
Cole Trick (8 months ago)
This dude is legit!
Scott Duede (8 months ago)
You are the man! I'm working on carburetors in a Kawasaki Ninja and a Vulcan right now, and I feel way more like I understand this part of the engine. Now I just gotta make sure I understand why one of those air filters is all moist with gasoline...
70sDub (8 months ago)
Excellent video!
steve revord (9 months ago)
when you bottom that air fuel mixture screw do so very gently and with the spring in place or you take a chance of busting off the tip in the hole and you will never get it out and carb is shot just my 2 cents
Dustin Dunnam (9 months ago)
good example !
sirozy (9 months ago)
Hey mate. When you were spraying the cleaning fluid in, did you spray in those two holes ?. (Your hand was covering the shot !!)
Mario Brian Vallecer (9 months ago)
Great video. Learned a lot.
briansmobile1 (9 months ago)
bepnds (9 months ago)
My motorcycle is running now thanks to you. Thanks for the video.
briansmobile1 (9 months ago)
You're welcome bepnds!
Jeffrey Lee (9 months ago)
Good stuff man. Thanks!
T.M (10 months ago)
very good explained! thanks!
George King (10 months ago)
thank u bro
briansmobile1 (10 months ago)
Welcome Mr.King!
Kowolski! (10 months ago)
Thanks!! This is the best video and it's so simple.. by the way the screw fell out @7:40
Michael Sullivan (10 months ago)
Great video. Thank you. I had a basic understanding of how carburetors work but I appreciate your detailed explanation.
GLADE GENTRY (11 months ago)
Knowledge is power! Thank you for sharing your time and knowledge.
Byron Santos (11 months ago)
Yes you did really good I really liked
MsNevadakid (11 months ago)
thanks brian! great demo.. ...happy trails....
Austin campbell (11 months ago)
Awesome video
Joe DeLuca (11 months ago)
Really great video, you have a great way of taking a complex (ingenious) device and making it simple to understand. Thank you!
john musuka (11 months ago)
You are the best bro, great teacher.
Shelby Sosby (11 months ago)
WOW GREAT VIDEO! Question. im having so carb trouble hence the reason Im watching your video. I bought my son a 110cc atv and the carb setup is very similar to this. My problem is that right at start up the engine just about max revs. I have spent all day trying to figure this out and this is what ive done. I removed the carb and cleanedcheck the barrel to see if it was sticking. the barrel and needle are reaching all the way to the bottom.the throttle cable is is working properlycheck the gaskets for air leaks. Everything is functioning as it should.Can you shed some light here?
K Kross (11 months ago)
dude thanks for the simplification awesome work.
Joseph Boyne (11 months ago)
bike shop are too lazy to fix my bike but thanks to you I can do it my self. good job.
very helpful, except i wanted a closer view of the main jet and whether it sticks up muc into that little horseshoe brass venturi piece.. i lost the main jet for an old carb so i am making another one on the lathe. so far the bike runs and is rideable, but bogs with too much throttle, the main jet needs some more thinking... p.s how much space should there be around the needle inside the main jet for the gas to slip past? how big should the hole be. how much of a gap around the outside of the main jet should there be for the air bypass to flow through? should i make the top of the main jet completely flat or put a slight dish/ cup/ recess/ concave shape/ bigger drill hole in it for the petrol to sit in? would that make it run significantly worse? its such finicky work...
Kert Sison Tare (11 months ago)
It's really helpful man! Thanks

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