Transparent Carburetor (Extended Cut With My Dad Darryl) - Smarter Every Day 

I’m 69 years old have been working with carburetors since my early teens I understand how they work and can probably explain to others the concept much like your dad did. Up until now I was satisfied with my amount of knowledge Today I am happy I lived long enough to see what you have shown us its like my brain just got HD tv in it! Thank you for making myself and others Smarter Everday

I lost count of the "yessir" responses. Love the Father and Son interaction.

My dad used to tell me "the smartest person in the room is the one that understands how much they don't know and knows how to ask the questions to attain that information". It reminds me a lot of this conversation.

The pride your father had in his voice when he said not many people have built a carburetor from scratch, priceless. That’s what we all want isn’t it? Good feels, thanks so much for sharing.

'I don't want a person that is paid to work on small engines, I want to learn about carburetors from my dad.' Right in the feels. but my main highlight is 48:04, "that's a good carburetor"

Destin, I’ve been a huge fan of yours for about 5 years or so. I’ve turned several people onto your channel. I have had a solid understanding of carburetor mechanics and theory for years now and people usually come to me because I’m sort of a carb whisperer. I have so much respect for you and your ability to “dumb down” fluid dynamics and all things physics for me. I work on paint robots and have to troubleshoot using fluid dynamics for Peterbilt Motors. With my complete understanding of carburetors, it has still taken me 2 hours to watch this video because I keep going backward watching the dynamics between you and your dad. It fills my heart with joy watching you two interact with each other. I can see the educated and brilliant side, as well as the experienced and brilliant side. I would love to meet you two. I am also a lover of Jesus, and ALWAYS look up the scriptures at the end of your videos. I type this knowing the abundance of subscribers you have. It would be radical if you ran across this comment.

The most impressive part of this video is your dad. I love when you were saying ‘you couldn’t see the vapour?’ And he replied with ‘I was looking for fire’ - he’s way smarter than you lol

Destin, what a special time with your dad. You’re both very fortunate.

Your dad is immensely likable. And you two have a great relationship.

When you you know you will love destins videos so much that you like them while the video's still processing :)

1:06:28 Years from now, you will be able to look back at this moment, where your dad has a full appreciation for the work that you do and genuinely acknowledges it. He gained a deeper level of respect for that effort and showed, in his own way, how proud he is of you.

The relationship between you and your dad is every kids dream. Good video!

Your dad is such a blessing. My dad is the same way. Eager to teach, gentle, patient, yet firm when he needed to be. That combination would solve most of the world's problems overnight.

Hey Destin, you asked a few questions through out this video and in your Patreon stream that I didn't hear an answer to during the video, and I figured I could share some of my Eng knowledge with you if your dad didn't answer them off camera already. Starting with the float malfunctioning in your carb. If the float sinks or the needle valve doesn't seat right on a reg carb, the fuel would gravity feed up into the carb through the jet and either leak out the front or into the cylinder while the engine was off. That's one reason they suggest turning off the in-line fuel valve when you are done using the motor. Most float valves I have seen have a rubber tip or o-ring seat that eventually degrades and causes this problem, and is fixed with a typical carb rebuild kit. If it can leak fast enough, it can make the engine run rich. Flooding the engine is essentially when the fuel air mix has become so rich that it longer supports combustion. Either by the stoich. ratio not having enough air, the spark plug is wet with fuel and won't fire, or worst case, the engine hydro-locks. Hydro-locking is when a liquid is inside the cylinder and prevents the piston from reaching TDC because liquid isn't compressible like air. As your dad said, any fuel, ethanol or not, sitting in the bowl will eventually evaporate and leave behind a gummy varnish. If using the engine often, ethanol doesn't really cause any problems. The problems with ethanol in fuel is alcohol is hydrophilic and absorbs moisture. If left for a while, that moisture builts up in the gas and can cause problems with rusting inside a steel gas tank, corroding the metal components in the carb from water exposure and galvanic metal reactions, and poor engine performance or no start since the water is heavier than fuel and it makes it to the engine first due to gravity. Vapor lock can be a few things but mostly is caused by a hot engine heating the gas in the carb or fuel lines to its boiling point, and those gas bubbles interfere with liquid fuel making it to the engine. Running a fuel line to close to exhaust is a prime culprit. Vapor lock usually happens after you turn off a hot engine and it won't restart while it's still hot. Since the fuel isn't being used, it keeps absorbing the engine heat until it boils and then it won't restart until it cools or the liquid makes it into the carb again. Vapor lock could also be referring to blocked or no vent on the gas tank and as the fuel is used the vacuum created in the gas tank eventually stops the fuel from flowing. Since you're working on a fuel injection video you prolly already know this by now, but there are a few difference kinds. Your dad mentioned direct injection into the cylinder which is one. In this case, since the fuel injector is exposed to the high compression of air when it needs to open, the fuel pressure has to be higher than the compressed air in the cylinder, otherwise the air would just be pushed into the fuel system instead of fuel coming out. This requires pumps that can get the fuel to vary high pressures and is how modern common rail diesels work with pressures upwards of 35,000 PSI. The first form of injection was just a single injector for all cylinders that just took the place of the carb jets and was controlled by computer rather than the engine air flow. They then went to multi-port injection where they had an injector for each cylinder, but they were still in the intake before the valves. Then came direct inject mentioned above, and now they have moved to a combination of port injection with direct in order to lower emissions and have the benefits of each. And since this is long enough and I doubt anyone is going to get this far, your dad was explaining that closing the throttle butterfly restricted the airflow, creating a vacuum in the cylinder which reduced the amount of fuel and air going in which caused the engine to slow down. That vacuum created by the piston struggling to pull air through a closed intake is the primary source or engine braking you feel when you take your foot off the throttle. Since diesel engines are controlled by fuel quantity and not air quantity, they don't have butterfly valves in the intake and therefore don't create the same vacuum braking effect that gas engines do. This is one reason many modern diesels have a Jake brake or some form of exhaust brake to create an engine braking affect.

One thing I never heard you "get" while you were explaining. The float bowl is not under a vacuum. It's vented to maintain a neutral pressure state. Just atmospheric pressure. The vacuum is only in the main port to the cylinder (which includes the venturi). The float is important because it partially controls the mixture. The lower the fuel level, the harder the vacuum in the venturi has to work to suck fuel up out of the bowl. Less fuel gets sucked up so the mixture is lean. The higher the bowl level, the easier it is to suck the fuel out so the mixture is richer. Mixture is controlled by the combination of the main jet size and the fuel level in the bowl (in a simplified world). Actual carburetors have idle circuits and more jets for better control of the mixture over a larger range of engine RPMs.

Destin, your Dad is such a cool dude.

One thing I noticed brought to mind one thing my Dad used to show me. He would talk about port and relieve of an engine. He was an awesome mechanic and dealt with some race engines back in the 60"s. I noticed after the fuel mixed with the air and at the end of the see through carburetor, there was a place where a spinning motion of the air fuel mixture could be seen. By relieving the port (smoothing out of the intake and exhaust of any projection or place that the mixture would not flow over smoothly), would possibly increase horsepower. Thank you for posting videos and by watching I feel "Smarter Every Day"

Now combine the see-through carburator with the see-through engine and it's golden!

The second channel, where Destin's full accent gets to shine.

Dang! He wasn’t kidding it was processing right now hahaha

Destin's dad: Laughing and smiling as they work on getting the engine to run Also Destin's dad: "It's a lot of work, and not as much fun as I thought."

This is an amazing video about carburetors relating to 4-stroke engines! Would you consider making a video about a 2-stroke engine as I am now curious?

Wow, wow, wow. I was a motorcycle mechanic that went to the best school in the country for that type of thing and this video took me right back to learning those lessons. Great interaction with your dad as well. Keep it up!

The second channel is about destin learning and the main channel is about destin teaching.

"...and that's why they call it a four stroke." Seeing the inner workings of the carb, alongside the explanations from you and your dad, my book knowledge left the page and made it to real world understanding. Those moments of understanding and sharing the bonds forged with family and friends are to me, the essence of "Smarter Everyday". Thank you for taking us along for the ride!

This reminds me of my dad and I. I grew up in Appalachian NC and my dad has been a machinist for 43 years, for the last 35 of those years it's been making prototypes and tooling for Big rigs. He taught me a lot and continues to do so, but I like to think he learns a little from me once in a while, probably not so much mechanical but I know a little more about electrical engineering. Spent my childhood learning to weld and fix farm tractors from him. Edit: of course if I was to start calling my dad "sir" he would slap me through the face, he can't stand that 😂

It is around 01AM here in Brazil and I'm watching a 1 hour long video about carburetors and I couldn't be happier. Thanks Destin, this video brings a lot of good memories about a simpler time when me and Dad just did stuff together. What an awesome duo you guys are!

Perpetual motion machine. I'm still laughing. Please thank your dad for us. I've watched and loved every and each video you've made, but this one... It is truly amazing to see theory in practice. Thank you from the bottom of my brain for this.

That was super fun to watch! There’s something so satisfying about learning things with your dad and helping them learn new things too. When I was a child, probably 10 or so, my dad gave me a bunch of electrical components, wires and batteries to play around with and learn the basics of electricity with. Now that I’m in my mid-20s, I’ve learned enough from the interest he sparked in me (pun not intended) that I am now often teaching him new things and advising him on how to set up home wiring and appliances. The idea that you can create something that helps you learn things is so incredibly cool! This video made me want to spend even more time with my dad working on projects and learning things together.

"perpetual motion machine" had me rolling on the floor

"I'm supposed to be having my second nap of the day." I don't think he needs it but defo deserves it. I so enjoy you and your dads episodes. Measuring to a millionth of an inch was really informative. And your dads recall ability was spot on.

This should have been posted on Father’s Day. You all have a beautiful relationship which is clear that you both cherish. Thanks for bringing a good dose of what is good about humanity to the interwebs.

As a fellow Mech Engineer that specialized in engines, I would have loved to have been part of this project and the next fuel injection video and to meet you and your dad. Everything my dad taught me as I grew up inspired me to become a Mech Eng. He taught me how all these things worked with the hands-on practical science, and school taught me the math and book science behind it. Your dad sounds like a very smart man. Never stop learning from him while you are able to. I'm mid 30's and I still learn as much as I can from mine. I was pretty proud when I was finally able to share some of my knowledge with him that I picked up from Eng school.

Your dad is awesome. Such a pragmatist, and he understands you SO well. "You will never stop evolving and perfecting your design."

28:45 Almost certainly, the throttle linkage isn't directly connected to the carburetor butterfly valve. The throttle lever tensions a spring in ) a wind-vane governor. Fins on the flywheel create air movement. This pushes on the vane and, as this force overcomes the spring tension, the governor linkage closes the throttle, allowing for a constant rpm at varying loads.

I'm a computer guy...not a car or small engine guy. I got that from my dad, who I learned a lot about computers from when growing up. He's also not really a car/small engine guy. This winter, we ran into an issue with a leaky primer bulb on our snowblower. When this happened, my dad and I were both a bit lost on what to do. After watching these videos about carburetors, I feel like I can tackle taking that apart to get it working again. Though you didn't explain the primer bulb, I think I understand it's purpose now that I understand how the carburetor works (obviously it shouldn't be leaking). The primer bulb introduces some more fuel to the throttle side before there is a vaccum to kick start the supply to the cylinders. Before this...it might as well have been magic. Absolutely love your channels Destin!

i dont have a father and this made me feel something i wish i had.. thank you

The engineering is spot on, the science is flawless.... but the most precious part of this video is you and your dad working together on this. It's beautiful, it's inspiring, it's just priceless.

Extended cut!?! YAAASSSSSSSS! Thank you for all of your hard work and dedication, Destin! 🙏❤️

I absolutely love the level of respect and love you clearly have for your father. That right there made the video...everything else was just bonus content.

Every second of this is so relatable. My father is a practical knowledge kind of guy, a hillbilly, yet he's college educated. Since my teenage years when my interests into cars developed, I've been picking his brain as my curiosity has evolved. I'm now 34 and even today I call him and ask him questions about things even if I have a decent understanding of them. Not so much for the knowledge, though I do still learn something every time we speak, but I like to see him exercise his mind. Having him recall information he hasn't had to in years usually brings back old memories and therefore he tells me old stories. As we grow older we sometimes get so busy that we forget to just sit down and enjoy conversations with our family and friends. I do my best to not take the time I have with my father for granted, especially as the clock ticks by.

Enjoy these special times with your Dad, Destin. Mine's gone and I miss him every day.

Darryl, if you're reading this, thanks for collaborating with Destin on this one. I watched the long and short versions and you were my favorite character in the story. I'm inspired by you to be the kind of dad to my kids one day that you are to Destin. I agree with Destin -- I didn't want the guy from off the street to explain how carburetors work either because getting to share in seeing you impart what you did know about carburetors to your son was priceless. Thanks for giving up that nap to film with the guys :D In lieu of learning and getting smarter everyday, one point I got more from watching this video than the shorter one is the difference between atomization and vaporization. Darryl voices this at 1:14:25 when he says, "I think vapor is what we're seeing at the end of that run. It's atomizing." I'm no expert and I don't know if this is what Darryl was expressing when he said this, but from my understanding, atomizing the fuel is when you break it up into tiny liquid droplets suspended in the air, whereas vaporizing is when the gasoline evaporates such that it is no longer in a liquid state of matter but rather in a gas state of matter. Hope that makes sense and I would appreciate any feedback on this from folks reading!

I have tried to explain how a carburetor works several times to people. They got the basic idea of it but never did as good of a job explaining it as your Dad did. The slow motion footage is amazing! It shows everything your dad was explaining. I will definitely share this video the next time I am asked about carburetors.

I'm so glad I found this footage. I love that you asked your father for help. You were right to not get a small engine mechanic to help you out, as you have gained so much more in this experience with your father as a person. He has wisdom and knows you well. It definitely shows when you're wanting to improve on the model you have, and he pulls you back to tell you you've already accomplished your goal and that you yourself could spend your lifetime improving on one thing. The wisdom to keep you focused. And your father should have confidence that his knowledge even if it's not all the fancy words holds weight and connect with others. My perception of your family is almost sickeningly wholesome. Keep it up!! When the engine isn't shutting off I have an internal timer I didn't know I had, to RUN

I wasn't even 30 seconds into the first video, and saw you learning with your Dad, and I said to myself "I sure hope he puts the unabridged version up on his second channel!" Your Dad's an absolute legend. Thank you for sharing this moment with us all. Brought back a lot of good memories of me being with my Dad tearing apart our first Briggs & Stratton lawnmower engine, and setting the stage for my love and passion of the internal combustion engine.

Oh what a treasure you have shared with us, Destin! There are so many things, from your dad being truly great, to you being ruthless and letting him pull that string over and over… ;) no, I am kidding, where was I, yes, those amazing shots of the vaporisation in the low pressure (I’d venture that it’s the sudden drop in pressure, not the smack of the wind that makes it vaporise, but the smack certainly moves the drop) - I bet those shots will be used in classes all over the world, with your permission or not :0) Truly magnificent effort. Thank you! It made me quite emotional watching it, you getting on so well with your dad and enjoying the shared learning - and your dad (and hopefully everyone, by now) appreciating that a good YT channel is a lot of hard work. That slight backwards move right before the intake stroke? I would suggest that this is a pressure wave coming back from the flowing mix hitting the suddenly closed intake valve. All in all, this video should be preserved in the Library of Congress for being emotionally and historically significant! Many thanks to your dad, your supporters and to you!

Hey Destin, a few things to add to your carburetor information list: High speed & Idle jets, Idle air control, and the air/fuel ratio 14.7/1. You made a simple, single jet carburetor with full manual control (a rudimentary carburetor). A simple basic carburetor, like the one from the tiller, has an Idle jet on the intake side of the throttle butterfly plate and the high speed jet in the venturi. When you look inside the venturi you will see the corresponding holes aligned with the two jets in the float bowl jet pick-up tube on the underside of the venturi. The Idle jet allows a smaller metered amount of fuel to flow while the throttle plate is closed and as you open the throttle plate, the venturi effect caused by the piston, draws the additional fuel through the high speed jet increasing the rpms and power generated by the engine. The air/fuel ratio for gasoline-powered engines is 14.7 parts air (atmosphere) to 1 part of gasoline fuel. However, different fuel power ratios or octane require additional adjustment accordingly. For example: If you are using typical rated octane power, 87, 89, 91 (regular, plus, premium) most engines will not need any adjustment, but if you were to increase that octane rating to 100, adjustments in timing and air mixture would be needed. Different fuels (propane, diesel) and combinations of fuels (ethanol and gasoline) will also require adjustments as well because different fuels burn at different power levels requiring varying amounts of air to maximize that power level and efficiency of fuel burn for clean operation. Carburetors are being phased out because their efficiency rating has been far surpassed by new technology in injection throttle bodies and direct injection, both mechanical and electronic. Sadly, the current EPA requirements are trying to eliminate carburetors entirely. Only time will tell. Awesome video, looking forward to the others.👍👌🤙

Thanks for checking out the second channel. Feel free to subscribe if you enjoy this deeper look into stuff!

Based off your Father's name alone I can tell he's truly a Gentleman and a Scholar

I deeply respect and admire you for admitting that there is a difference between ‘book knowledge’ and the ‘dirty fingernail knowledge’! I am no engineer, but I do have an engineering mindset and I have worked along side several engineers. And it has been amazing to me to see the vast difference between these two types of knowledge. I am glad you have the humility to admit that because some engineers don’t!! Thank you for this video. And although I grew up on a farm and have known how carburetors work, it was good to see it in action. Loved it!!

I remember the days when i was a little kid (im 56 now) i always had to present my comment to a person via mr, mrs, miss (surname) and when they would speak to me i would follow by saying yes/no mam, sir. And hearing you say yes sir, brought respect back into my heart. Moment like this makes these types of videos so heart warming, plus i learn too :)

Love your dad. Could watch him talk with experience and passion anytime. It's like asking a kid about the toy boat he made himself, he will always have an answer for everything.

Destin! Here’s some more insight on the oscillations you’re seeing in the high speed around 53:50. Picture your engine cycle timing around 720 degrees of crankshaft rotation (two full turns gives a full cycle). The engine you have your DIY carb on is a 1 cylinder engine so you only have 1 power stroke in the full 720 degrees. Now tack on 3 more cylinders. You still only have 720 degrees of crank rotation but now there is 4 power strokes per engine revolution. You have a power stroke every 180 crankshaft degrees now (720/4) which helps smooth it out a bit. Now turn that 4 banger into the V8 in your old red pickup truck. Still 720 degrees of crank rotation but now 8 power strokes. You get where I’m going, now a power stroke every 90 crankshaft degrees. (720/8). This will theoretically smooth it out even more. You can keep doing this in to crazy cylinder count engines like V12s or W16s and will have power being delivered to the crankshaft at most any point in its rotation which prevents the harsh vibration from a single piston suddenly accelerating the crank. Then some engines just have inherent vibrations and sometimes manufactures will have a counterweight that spins in time with the engine to cancel out vibrations. Hope this makes sense to anyone that bothered to slog through reading it all, thanks!

100% wholesome and educational video! Thank you Destin and Destin's Dad! 👨‍👦

You're a lucky man. Great dad you've got there. Reminds me of my gramps, used to spend afternoons with him in the shed cleaning and restoring lawn Mower engines.

As a fellow Southerner I have nothing but love and appreciation for Destin's liberal use of the phrase "Yessir". I also, would love a "Yessir" counter in this video lol

Hi Destin, I love the content you create, your dad and his accent, and the relationship that you have. Thanks for picking my brain and the entertainment!

"Hear the instruction of thy father ... they shall be an ornament of grace unto thy head..." - Wow, perfect reference for today's video. (I really like your dad. I hope he will agree to some more videos in the future.)

You learned from your dad, and now we all get to learn from the both of you. So many thanks to both of you!

This is gold, thanks for sharing. I love how your dad explains things

At half century and a bit I think I know how carburetors work. But it's always a school day. Thanks. Be well and stay safe. My father was an mechanical engineer and raced vintage and veteran motorcycles and I watched him scratch his head on occasions with icing.

I hope you like it when if finishes processing :)

Dads new found respect for the hard work and dedication it takes to make these short videos we see on You Tube. What a classy guy, mutual respect shown here. Way to go guys

As with all of your videos, this is beautiful on many levels. I love your dad. You've probably realized this at this point, but the thing to remember when thinking about how the throttle reduces the amount of fuel/air entering the cylinder is that both the fuel vapor and the air are compressible (and "expandable" as it were). So because the amount of time that the piston is moving downward in the cylinder is sort of "fixed" by the RPM of the engine, there is a fixed period of time during which the fuel/air mix can enter the cylinder in the intake stroke. So what happens is that if the throttle is partially closed, restricting the flow-rate of fuel/air into the cylinder, the vacuum in the cylinder is not completely "filled". There's still a partial vacuum in the cylinder when the intake stroke ends, the valves close, and the piston then begins the compression stroke upwards. At some point in the compression stroke, the pressure in the cylinder reaches atmospheric pressure, and finally, the fuel/air begins to actually be compressed. And by the time the piston reaches TDC, there may be a bit of pressure, and also a bit of fuel-air. So you get a smaller explosion, and thus, less power due to the throttle doing its job.

Destin, thank you for documenting this footage and putting on the internet for what hopefully is decades to come. We need the reminder of what an awesome parent/child relationship is and then the whole creation of a thing to understanding it at a very detailed level.

Thank you for what you do generally, but especially for sharing your dad with us who never got that sort of relationship. I've been learning small engine repair and landed here from the first channel. Grateful for you both, and your team.

Destin, thank you!!! Thank you for your passion and love of this life. I know “who” fuels your spirit. You are and inspiration.

The amount of "yes, sir" in this video is refreshing. Aww, 'not too many people have built a carburetor from scratch'. Your pops gave you a helluva compliment.

OK, who else laughed at 8:59? Having never heard this mnemonic in the concept of a 4-stroke engine, my brain goes other places with it. 🤣

Father time is the greatest teacher of all, and a person with enough years in life absorbs those lessons from Father time. Mr. Darryl is a man full of those lessons, what a treasure and treat for the rest of us to be able to learn from.

This was awesome to watch. I dont know what was more interesting; the father/son dynamic, learning about the carb, or the engineer/learn from experience dynamic. Awesome!!!!!!!!!

Love your dad and the interaction you had with him in this video.

Your dad just taught the internet. Thanks for sharing your dad moment. Lots of people don’t have dads.

I've watched every single video you ever posted, but this one by far is my favorite. 1 hour 18 minutes and 42 seconds of pure enjoyment. Thank you!

This reminded me of the time i spent with my grandfather taking care of his property and small engine equipment. Thank you Destin, and to your Father as well.

I could watch that gasoline coming up and getting blasted by air on loop for hours. Don’t know why but it reminded me of the tides coming in and going out at the beach. Very relaxing.

My favorite part about throttles on lawn equipment is the turtle to rabbit scale. Always makes me smile.

"...I want to learn about carburators from my dad." Man I wish I had grown up with a dad!

The first automatic chokes were controlled by bimetallic strips. Since the carburetor was in thermal contact with the intake manifold which was in thermal contact with the engine, as the engine warmed, so did the carburetor, and so the bimetallic strip gradually opened the choke and moved a throttle stop to allow the throttle to close down more as the engine got warm. In my old car, the throttle cable was also connected to a mini-pump which added some extra gas to the venturi as you pressed down on the throttle to give you a little more power as you opened it up. So to start it from cold, you would pump the gas once. This did two things: it opened the throttle which pumped a bit of extra gas down into the intake (not really essential) and it allowed the bimetallic strip to close the choke. Then you started the engine, and as it warmed up, the choke would gradually open.

When you're working on a go cart carburetor and the perfect RU-vid series comes out so you can understand what you are looking at

I smiled all the way through this special video. It made my heart happy. I love the way that even when it takes you a while to 'get it', your dad is neverendingly patient. What a wonderful man and exceptional dad. 👍😁

This is a great video. I never realized carburetors were so interesting.

This is one of my favorite videos 📹 I love how your dad and you work together

Awesome video and a million thanks to both of you. I, widowed mom of 2 young boys, am grateful for this content to teach them to have working knowledge, or better an inspiration to delve deeper if they desire. Love your channels and the varied content amazes me along with your enthusiasm for all your knowledge and understanding. Keep on keeping it real. Children all over the world can reference this channel better than any book, library or school--- It's right here when you need it. What your Dad taught us. AWESOME

Destin, "I want to learn from my dad." I got a little choked up.

I LOVED THIS! before today i had 0 knowledge of how a carburetor worked or an engine for that matter, now tho i feel confident enough to simply explain what each stroke is doing and how the parts of a simple carburetor work as was shown in /the video, like pointing to parts and explaining, thank you for this destin

Destin, its nice to see another engineer stumped in the same way by a machine that is so simple compared to many other machines

I love how the two of you talk through your understanding of the subject

Destin, love the video and love to see a son, young or wise working with their old man. Few things as someone who works with carburetors a lot, the terminology here will be very confusing for many. This specific carburetor has no “needle”. The float valve which has been referred to as a needle in the video, is just that, a valve. It allows fuel in, when the float is low and shuts fuel off, when the float raises as the bowl fills. The two holes inside the base you questioned are main and pilot “jets”. This is an Extremely simplified carburetor but they all work on the same principles shown and so awesomely demonstrated with the high speed! Super fun and super cool to watch! Would love to chat some time and maybe even show you a few different carburetor styles via video call or could even send a clip should you be interested and have the time. Not seeking recognition or anything of the sort, but I know you love to learn and and I’ve learned a ton from you. Would be a lot of fun to show and explain a little more in detail something I become smarter every day in, while working on small engines like you’ve shown, if you’re interested!

Destin I love this thank you for sharing. As an educator and trainer in my field you did something that I love to do with my students and trainees, have them teach you what they learned. To me this is the most concrete way to set a principle in someone's mind. Thank you and your for teaching me more about something that I thought I knew but I didn't fully know. Keep up the good work brother.

I love how the music you used is I’ll Fly Away.

Amazing how much work, care and love went into this video. Really appreciate it. You have taught me so much over the years. Thank you

Love the whole video the science the father son bonding and the music too

Regarding choke, if you close the choke and open the throttle, the intake stroke will provide more vacuum to the fuel bowl which will cause more fuel to leap up into the venturi. The volume of fuel-air will be (mostly) the same, but the ratio of fuel to air will be higher. With a fully open choke, the intake stroke will pull less vacuum on the fuel bowl and the mixture will have less fuel.

i got to learn so much from you, it's nice to see the relationship of you two. thank you

You are so fortunate to have a mentor like this.

I love your dad. It was nice seeing you two work together on this video.

You should totally do more content with your Dad, it will be so precious to you one day! Glad we both still have our Dad's!

Love you dad. I would be very pleased to see more of him. He's a gem.