Why float height is important

[@kentuckyblugrass]

I have watched dozens of videos mostly from pro riders mechanics and your video BY FAR trumps them all. The best explanation of how the inner workings of the float height and jet working together. Thanl you very much for taking the time to make & upload this video. Jseth '99 RM250

[@TepcoCycleRepair]

Thank you for the comment, glad I could help!

[@paulk5311]

agree

[@ericmartinez4053]

Total agreement!

[@ScottMiller-tu3gg]

I have watched literally dozens and dozens of carb videos and you are the first to explain this! Thank you so much!

[@TepcoCycleRepair]

Cool, thanks for watching!

[@nicklings4855]

Most informative video I've seen on how the float system works. Awesome.

[@TepcoCycleRepair]

Thanks for watching!

[@michaelwachsmuth1583]

Definitely the best video. Everyone else i seen doesn't explain what's going on and why

[@kerowynkat1643]

Thank you for explaining this. I had been having trouble with my dirt bike and after watching your vid I was able to adjust it properly. I Watched at least 20 other videos that did not help with my problem at all. Saved me a bunch by not having to take it into the mechanic. 👍

[@TepcoCycleRepair]

Awesome, glad I could help! Thanks for watching.

[@aischaparker9471]

oMG thankyou so much for explaining how these things work. ive been taking them apart following a manual but not really knowing what the hell im actually effecting. nice one.

[@markmassy2400]

Thanks mate it's all starting to make sense, I have a 1979 Honda XR80 that's way to rich. I'm on it 21.5mm

[@ericmartinez4053]

Sir, that was one of the best videos I have seen in a while. I spend a lot of time learning from KZbin videos and all the extra chit-chat, self-promotion and rabbit trails are frustrating. I love videos like this that are no-nonsense, straight to the point. Excellent vid!

[@TepcoCycleRepair]

Exactly how I feel. I try to keep it to the point. I know what you mean. Thanks for the comment!

[@SW-nq1bx]

@TepcoCycleRepair I wholeheartedly agree! You are so clear and concise about what to look for, what to do, even a TOTAL novice who has never worked on engines before, can understand. You should be a TEACHER for next generation!

[@petewright3952]

Excellent and extremely helpful especially the simple explanation of the importance of the holes in the "emulsion tube (which is the name I prefer to use to stop confusion between jet needle and needle jet). Thanks

[@wowguy3562]

Just bought a small boat engine today, I've taken the carb off at least 10 times, carb spray all the way thru ultrasonic cleaning in gas in a zip lock bag in my harbor freight cleaner, still didn't run right, it wasn't getting enough gas I think was the problem, after watching your video last, and getting the float to where it was just touching the float needle, I crossed my fingers and gave it a shot. Your video helped so much, fired right up and revved like it should. Thanks for posting this video

[@TepcoCycleRepair]

Heck yeah, awesome! Thanks for watching!

[@johnnynunnery7113]

I agree with Nick lings I learned more from this 5-minute video than I did from anyone else!! Thank you

[@lazarus2950]

Thank you! Just rejetted my carb and adjusted the float height but honestly had little idea what float adjustment did for the fuel mix. This helped so much!

[@vasilgarnev]

Awesome stuff! My scooter was running lean on standing on the stands and once I put the scooter down to ride it it would just stall. I was suspecting it was the float, but after watching your video I know this is exactly the problem. Thank you for the in depth video!!

[@Chip6565]

Awesome video. I never understood why it was so important to ensure the float level is set correctly and your explanation was simple and straightforward and to the point!

[@lexbrusb.1821]

finally somebody knows about holding the carb at an angle while measuring the float height.

[@azharmalik66]

bro, God bless u. Your vid has enlightened me a lot. I'd no information about the functioning of emulsion tube. thanks again!!!

[@TepcoCycleRepair]

Cool, thanks for watching!

[@anthonyscott16]

I realize I’m super late, but I have to echo the sentiments that everyone is sharing. This video is by far the most direct and informative on this subject, hands down. Thank you!

[@olddave4833]

I'm just wondering why he is using a carburetor that 99 % of the people have never seen

[@TepcoCycleRepair]

Thank you!

[@TepcoCycleRepair]

It's just what I had on hand, the same applies to any carb.

[@UnleadedApe]

Great job explaining! My Xtrainer (pretty much all of them) need to be adjusted as they waste so much fuel, this explains the "why" great. Thanks

[@TepcoCycleRepair]

I'm looking forward to picking up a Beta myself. Thanks for watching!

[@privatenoodle1049]

So the main thing i have learnt from setting your carb on a bike is to ALWAYS check the service book(if you can get it) before tampering with different jets. great video, ride safe...

[@ljckclark8973]

Best video I have seen on this. I was trying to understand why being a mm out on the float level would make much difference, and you clearly explained it. Thanks!!

[@paulk5311]

best and simplest video i have seen on the subject. i just watched a video of over 15 minutes and the guy said too high a float height will make it run rich but never explained why. with your explanation and simple drawing the message was conveyed so anyone should would be able to understand.

[@bluevanila69]

ive been lookin for this explanation like forever... coz many ppl talks bout HOW... how to adjust... how to do that and this... fewer talk bout WHY... tq...

[@Tod_Unctious]

It seems a common theme to say how helpful this video is regarding the understanding of why the float height is so important. I agree with everyone of them. Such a helpful and simple video yet brilliant. I was reluctant to watch as I was looking for information on a bing carburettor and as your image does not show the same make I did not think it could apply to my carburettor. How wrong was I. Your video clears the intrigue and mystery regardless of the make of carb. I totally get that float height is your 1st thing to check. It is so obvious when this is explained they way you have. What a frickin awesome video. Thank you thank you thank you. I doff my cap to you Sir 🎩

[@TepcoCycleRepair]

Thank you for the comment!

[@martinhernandez7733]

Wow thx buddy I can't believe I'm still learning new things about a carburetor thank you

[@richardraby6266]

Very informative and the first time that i realised that float-height was SO important for the actual mixture metering and not just to make sure you weren't running "dry" on fuel.

[@Tod_Unctious]

Hi Richard I totally agree with your comment. I thought it was just a reserve of fuel waiting to be used. We learn everyday.👍

[@BanditK]

Tab doesn't go out of adjustment but does get a notch worn into it that can get bad enough to throw things off at idle

[@Janovich]

Perfect. First video that actually makes me understand :o

[@timdavisphotography7366]

Best description of float lvl and why it matters! Thanks!

[@bruce.chloereid6090]

Thank you for exposing the mystery of float level importance and effects.

[@MatthewGill-nv4tb]

I have an 83 xt200. Theres an older guy in my town everyone takes their bikes to. My float is different it doesnt have that tab and the spring is on the outside of the needle. The guy looked at and his suggestion was to just buy a new carburetor. Any float with brass components is adjustable. You just have to figure out how. Im just pissed that im getting all these videos AFTER i fixed it. Great video and explanation. Im just making this comment for people that have one like mine which i havent found a single video for

[@ahahaa1602]

thank you. Gonna try this but this video is definitely the best in depth explanation of adjusting the float and how it works.

[@scott4300]

Great explanation . I've been tooling around with small carbs for a few years. And not explained a couple of things I didn't know... thanks

[@matthewbarton9928]

Amazing video. I learned loads thank you from the UK

[@davidsizemore9906]

i've always known that proper float level prevents fuel overflow and fuel starvation. i didn't know it effected the fuel mixture??? thanks for the video.

[@TepcoCycleRepair]

Heck yeah, get it dialed in!

[@adeel.designer]

finally i understand how to adjust float height properly without having a spec manual. Thanx for sharing knowledge...

[@TepcoCycleRepair]

Excellent, thank you!

[@Spartan375X]

I've been trying to study carburetors for my bikes for almost 4 years now and I'm barely starting to make sense of these things. Thanks for this bit of info!

[@TepcoCycleRepair]

Your welcome, carburetors are awesome things.

[@Youtubecensoredmyusername]

Spartan375x I know what you mean but it’s not rocket science. If you lean carb only a little and it’s dripping fuel from the float overflow fuel level too high. If you’re wide open throttle and after 10 to 20 seconds it bogs down float height is too low

[@alexjohnson3696]

Awesome, thanks so much 👍

[@p1nt0n6]

Just wanna say thanks man.. Finally i know what are those hole all about..thanks man.. awesome. Hopefully you can explain more about brass pipe in front of pilot jet ( usually in PE28 KEIHIN carbs) Thanks.👍👍👍👍

[@joef.3094]

best explanation (actually, the ONLY explanation) i have seen regarding the effect of float height on fuel mixture. good job. i would add, for those new to the inside of a carb, that the plunger on top of the float needle is spring loaded and you should be able to depress it easily and it should spring right back . sometimes varnish from old fuel will seize it up but i have a good record of bringing them back to life by spraying with carb cleaner.

[@TepcoCycleRepair]

Good point on the plunger, I went over it in another video, thanks for watching!

[@gasnxt6805]

Well there you go. I will now fix the rich mixtures on my dt200r. Thanks heaps.

[@jamesmerritt4765]

I'm regretting a 250R can I go very low and I'm still very rich in main jet so this video really just helped me out a lot thanks keep up the good work Buddy

[@TepcoCycleRepair]

Yeah make sure your float level is at the stock set height. If you're still having rich problems make sure your slide needle is not floating and is locked into position.

[@DudeGuyWho]

You've put together an awesome channel. I think I've saved at least 50 videos to get back to. Thanks much!

[@TepcoCycleRepair]

That's awesome to hear, thank you!

[@LCARSADV]

Outstanding video, thanks for doing that!

[@samiismail8690]

This video sorted out my rich jetting issue! Many thanks !

[@isaacpulido1510]

Thank you sir, from Lake Havasu City Arizona

[@TepcoCycleRepair]

Thanks for watching!

[@MrJames-dk3my]

Great explanation, very simple.

[@Adrian-jk4kx]

Thanks....clever little devise the Carburetor.

[@TepcoCycleRepair]

Yes it is.

[@aaronrose186]

Very discriptive and makes a ton of sense.....thank you sir

[@azharmalik66]

thanks for this detailed video on the emulsion tube and the fuel level. May God love and bless u!!!

[@TepcoCycleRepair]

Thank you my Friend.

[@charleswest3008]

Thanks so much for this very thorough explanation!

[@andrewengland971]

Ever since I switched to race fuel on my yz125x and now I deal with float issues. Leaks outta my overflow. Never did before.

[@TepcoCycleRepair]

The fuel shouldn't cause float issues. Just double check it and make sure no debris is stuck in there.

[@andrewengland971]

@@TepcoCycleRepair cool. Thank you for the tip.

[@omrjordan4847]

Finally an explanation that I could understand. Thank you sir

[@pradeepwijesinghemuhandira6146]

Finally the importance of float level is revealed. Thanks a lot for simple but very [powerful explanation. Though the float level prescribed by the manufacture is achieved still we are not sure if the float level is sufficient to submerge the first 2 tiny holes of the main jet holder. It would be nice if you can reveal us the trick.

[@TepcoCycleRepair]

Each emultion tube is different for different applications, some carbs have different ones you can chance to achieve different results. If everything is stock the stock height is sufficient to work with the emultion tube. Many people adjust the float to try to fix other issues, which in reality it should almost always be set to the stock height and the running problem lies elsewhere. (Usually jet sizes)

[@kelhawk1]

I replaced my 125 Xmotos carb with a 22mm Mikuni, then moved it to my retirement property at 7500ft elevation about two years ago, where I normally spend my summers. I think I may have lowered the float back then to help with the altitude, then never followed up on it...can't remember...Covid1984 makes it all so hazy...lol! Currently it will not run without the enrichment lever on. Been tryin needle and main jet, and suspecting the lean float was starving all the stages. After hearing you confirm that, I can't wait to play with the float adjustment! Hopefully I will soon happily update this comment! Update: Disappointed. I feel have taken the float adjustment from one extreme to the other, yet the bike will still not run without the enrichment turned on. If I blip the throttle ever so slightly, it dies. Getting rolling requires slipping the clutch at fast idle, but applying *no* throttle until up to speed. It will accelerate only at full throttle, and the exhaust sounds like it's lean and backfire tends to occur. At this point I wish my original carb hadn't got left back in Kansas! Lol! Now I am wondering if old fuel could cause this? I had a TT250 decades ago that ran but wouldn't accelerate till I finally ran my number size drills thru all the jets. They looked clear, but had a thin layer of "varnish", effectively reducing their size. Does this also happen with ethanol blend fuel? I am sure the jets are clear but have no idea if maybe the year old fuel could be causing these symptoms. Guess I will drain the tank and try some fresh...not real hopeful tho...

[@niconine268]

Fantastic simple & concise tutorial. Thanks bro. Big help

[@mohsenkiae]

Thank you so much man !!! Great explanation !

[@cramersclassics]

Excellent video. Concise, illustrated and well narrated. Even after rebuilding a 1000 carbs I learned something. Bravo!

[@rikmeyer1469]

Fantastic explanation!

[@patfrehner5906]

great first one with super explanation.

[@TepcoCycleRepair]

Thanks for watching!

[@antzlink]

Great thanks for the explanation understood everything

[@prout27cat]

clear, concise priceless exlplanation thanks

[@niconine268]

Nice one. Clear & concise tutorial

[@ivanthompson8870]

Well done . best and simplest explenation so far.

[@brentmarsh1325]

I think that this is the video I've been looking for. I can't bring my idle jet out ( lower RPM) far enough to lower the RPM. it falls out before I reach that point. and that means I can't turn my air/fuel jet out far enough to to get the proper lean. Its idling way to high.

[@TepcoCycleRepair]

Check your throttle cable adjustment to make sure the slide is sitting on the idle screw first.

[@brentmarsh1325]

@@TepcoCycleRepair Very good point. I'll have a look

[@clivesilk3501]

This really helped !! Thanks I adjusted the tab wrong and it flooded I’ll level out the tab and see if that corrects it

[@greasebeast1]

Are you sure about the source of the air that surrounds the emulsion tube.?It seems to come from the small passage at the air input side of the carb, not leaking in around the main jet. Also, I believe all the small holes in the emulsion tube are for air and not for fuel.I believe all the fuel should come through either the main jet (not idling) or the pilot jet (idling).

[@TepcoCycleRepair]

There are vent lines that let air adjust in the bowl and around the emulsion tube, my explanation starts at 3:10 about the emulsion tube. Yes most fuel comes through the main jet but if the float is set to high, higher than any of the holes it will suck fuel through the holes as well. To many holes under the fuel level=to rich to little=to lean. Hope that clarifies it better. Thanks for watching.

[@tonycerruto5157]

Great vid man, thanks. I've been having a Hell of a time trying to adjust my Keihin PKW on my KDX200. Was dumping fuel really badly, also running way rich. Seriously bogging on the low end. So I Lowered the floats to cut fuel off sooner. That stopped the dumping of fuel but its still bogging when I crack the throttle. I backed the fuel/air screw out so much that it shook its way out on a trail ride! Should I mess with the float tab some more? Its a new float from a rebuild kit. If I re-jet from stock, what main jet should I go with? I also live in NC. Weather is cooler now. Not crazy humid like this summer. Thanks again Brother. T

[@TepcoCycleRepair]

Set the float height to the stock setting, I wouldn't adjust it to fix a problem. Your jets should be in the 42 pilot and 155 main or somewhere around there. The mixture screw leans it out when you back it out so a bog down low will be worse the more you back it out. Set it to 1and 1/2 turns out to start. I can walk you through some jetting if you need it but start out by making sure everything is in good order, air filter, silencer, plug etc.

[@slixeny2atl754]

Thanks so much for that information you just helped me fix my 2013 yz250 it was revving to the moon after start up previous owner said that it needed carb work thought it was the crank seals were bad and caused a air leak and had bike screaming after starting. After watching this video I observed and noticed He or someone else messed with float height causing the bike to get massive air and little gas. Would of never know if it was for this informative video 🤘 you rock bro Ps- I ordered a lectron carb two days ago to see if that would fix it. Should I keep lectron carb or return and get money back since I fixed my problem???

[@TepcoCycleRepair]

People say alot of good things about the lectron. You can easily sell it if you don't need it and loose very little on the resale.

[@theilluminatimember8896]

Now I can sleep thank you 🙌

[@thomashansen3450]

finally I´ve understood the system, thank`s v.m. Thomas

[@raulandchristinaparra4677]

good video, straight forward and helpful.

[@DirtbikeDad]

I’m starting to think my float is not adjusted correctly. When I first got my bike (yz125/144) it would leak out over flow. Replaced float with a new one and adjusted it to stop leaking. It’s been fine on most part until I was out on a long ride. Bike had a new plug and when I got to about 1/2 tank bike seemed as if was running out of gas. It would loose power then snap back in then do it all over again constantly. I replaced plug and ran fine briefly until same issue. Plug was still new looking when pulled. Haven’t rode since. Not 100% that’s what the issue is but it’s a possibility. I am going to play with it a hair just to check it out plus check reeds and clean petcock. Any input you have would be great. Best explanation of float main jet by far

[@TepcoCycleRepair]

Set the float to the stock height, most likely it's something else. Possibly vapor lock.

[@vagishgpatil3013]

Today I cleaned the Carb 3 times and It's Starts the Scooter but when I pull the Throttle It's Shutting off..MAY be It's a Float Problem.Where the pilot her may not be getting enough fuel

[@briangreen591]

the only time fuel is in the area around the emultion tube is when the engine is not running, when the engine is running the needle valve controls how much air is blended with the fuel being metered by main jet, float level controls the amount of vacume requied to pull fuel up from both jets,, the pilot jet emultion tube flow is controlled by the size of the holes in the tube. your explanation is only part correct.

[@SoddingaboutSi]

Float height does go out of adjustment.

[@lbeck119]

Awesome video.... Keep them coming

[@Aridrona]

Short answer,it affects your jetting.

[@calvinmartykleinmcfly6998]

Really great advise there. Nice going.

[@RobbiRocks]

😄 These floats have been a pain in the ass, but Thank you, this has been helpful

[@tonykartracer8032]

Good explanation, sir! Very much appreciated.

[@jakehardy3980]

This helped a million! Thanks!

[@denisthek]

Thanks great video and to the point-don't know how you can take the cold-your pretty tough.

[@shinjrock7778]

New knowledge for me, thanks sir

[@chetanpanchal5517]

Very good information for me. I am in search of such information for my scooter which does not running on idling, engine race is increased even at idling and sparkplug get black and clogged up frequently might be due to rich mixture. Thanks

[@BrokenPineapple]

If u change your jet size, will you have to adjust the float level or just keep float level at stock requirement?

[@TepcoCycleRepair]

Float level stays stock

[@kennorway9690]

very informative and clear! got a question though, how do you know to which height to set up your floats if you're going for other jet screws?

[@TepcoCycleRepair]

Float height should always stay the same no matter the jet size.

[@kennorway9690]

@@TepcoCycleRepair yeah obvisouly ! got confused for a minute, thanks for making it clear !

[@Dominoid86]

The sun cant come up any faster, i wish we could drop pics here, id show you what i did to my pro pit 90ss

[@eg6199]

Great job man. Well done, clear explanation.

[@shanebowen2313]

Great job I finally understand somebody

[@notsogreat123]

Float height is a rough adjustment. The actual fuel height is what really matters.

[@TepcoCycleRepair]

That's correct, the manufacturer decided that at the recommended float height, the fuel height would be correct.

[@notsogreat123]

That's not always true though. That's why it is important to actually measure fuel height in the bowl.

[@TepcoCycleRepair]

@@notsogreat123 But most don't have the level of fuel listed but they always have the float level. But for a tuner I understand what you're getting at.

[@Qweef_Tornado_904]

If fuel was flooding out of my carburetor out the front into the air intake, what would that indicate? This is on a Honda eu2200i. New jets, float, needle, and gasket were put in. Not sure what needs adjusting. Thanks!

[@TepcoCycleRepair]

That's usually a sign of a bad float needle seat, float needle, and a bad fuel valve. One or all of those is where I would look. When you replaced your float needle did you polish the seat in the carb?

[@geoffreycasey875]

Great video..👍🍀🇮🇪

[@adamperry5693]

Great video- learned a lot

[@submoto]

My bike dies when I decelerate. could that be floatbowl-related? it also when the bike is tilted forward (front end dipped)

[@TepcoCycleRepair]

Yes, sounds like it's to rich on the pilot jet. When it's idling blip the throttle and pay attention to how it goes back to idle. If it slowly drops down to it it's lean, if it drops lower then idle then creeps back up to idle it's rich. If it's not idling at all, turn the idle up just enough to idle do you can try this. Then start with your mixture screw, 1/4 turns at a time, if that doesn't fix it you need to check your float height, if that's good you'll need to start changing the pilot jet.

[@kristijankopjar4629]

Thanks on detailed explanation. One question: It is regarding 2t 125c go kart engine. It happens that in the corner engine bogged down, on the straight going like hell but in the corner allmost no power. Can this problem be connected with wrong float level? (engne:tm racing k9b, dellorto vhsh30cs carburetor)

[@TepcoCycleRepair]

Certainly could be, easy to check. Most likely you just need to adjust the jets. If it's lean bogging mid turn try raising the needle one notch.

[@nickellegalang3025]

You are such-like a genius

[@derektaylor5823]

This is the first time I have seen this video. It is very helpful. I do have a carb question for you. I recently bought a new streetlegal enduro. The idol runs great and as far as I’m concerned, it doesn’t run too rich or too lean. But my problem is a very slight drip from the overflow carb tube when the bike is on the kick stand after running. When I say slight, I mean slight. Over a night, I may have a couple drops or three drip from the tube. Is this normal? I run zero ethanol gas in the bike and have even drained some fuel from the carb and new gas from petcock into a bowl to see if maybe there was debris around the drain screw. The only other thing I can think of is the float may have not been set right from the factory? Any info will help. Thanks.

[@TepcoCycleRepair]

Perfect timing, I just put this video out. Should answer all your questions. kzbin.info/www/bejne/eYLQkJWpZdqcitk

[@derektaylor5823]

Thank you for that. I will check some of those things on my bike. Since it’s running fine, I may start with the drain screw to see if the tip is corroded… just weird since this bike is brand new…

[@TepcoCycleRepair]

@@derektaylor5823 Could be debris from assembly in the float seat, or the float hight might be off. I've had several brand new bikes come to me with the float height incorrect.

[@nate1593]

Thanks this is great. One question though how do you know when to lower float level (more fuel) or increase jet size (more fuel)

[@TepcoCycleRepair]

The float level should always stay the same. Changing jet size to a larger size does not require you to change the float height. Thanks for watching!

[@Kyelyman425]

Omg thank you so much you just saved me hours and money your the shit

[@flyboyfs]

HI, i have a question regarding to float, i see some carburetors has the weight floats to change eg. 9.5gr. 11gr on Dellorto, what are the affects on this change? and other qustion, on the nozzel one carb of mine, has no small holes its a Dellorto phbl AQ256 type

[@TepcoCycleRepair]

Weighted floats are for non adjustable float Chambers. A heavier float will sit lower letting more fuel in the bowl. Dellorto has several emultion tubs with different amount of holes in different locations. Your's may only have two large holes instead of many small holes.

[@MatthewGill-nv4tb]

How will you know its the float..... it will idle and die as soon as you touch the throttle