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
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.
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. 👍
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
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!
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!!
Sir, that was one of the best videos I have seen in a while. I spend a lot of time learning from CZcams 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 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!
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!
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
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!!
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 🎩
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...
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...
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.
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.
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.👍👍👍👍
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.
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???
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
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.
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!
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
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.
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)
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
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.
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
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.
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...
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.
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…
@@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.
can you help me out? I have a 150cc bike which I converted from CV carb to Round Slide carb the problem is no matter what I do change the jets, needle clip from top to bottom it always fouls the plugs
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
Thank you for the comment, glad I could help!
agree
Total agreement!
I have watched literally dozens and dozens of carb videos and you are the first to explain this! Thank you so much!
Cool, thanks for watching!
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.
Most informative video I've seen on how the float system works. Awesome.
Thanks for watching!
Definitely the best video. Everyone else i seen doesn't explain what's going on and why
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. 👍
Awesome, glad I could help! Thanks for watching.
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
I agree with Nick lings I learned more from this 5-minute video than I did from anyone else!! Thank you
Perfect. First video that actually makes me understand :o
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
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!
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!!
Sir, that was one of the best videos I have seen in a while. I spend a lot of time learning from CZcams 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!
Exactly how I feel. I try to keep it to the point. I know what you mean. Thanks for the comment!
@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!
Awesome, thanks so much 👍
Thank you for exposing the mystery of float level importance and effects.
Amazing video. I learned loads thank you from the UK
bro, God bless u. Your vid has enlightened me a lot. I'd no information about the functioning of emulsion tube. thanks again!!!
Cool, thanks for watching!
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!
Best description of float lvl and why it matters! Thanks!
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
Heck yeah, awesome! Thanks for watching!
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!!
finally somebody knows about holding the carb at an angle while measuring the float height.
thank you. Gonna try this but this video is definitely the best in depth explanation of adjusting the float and how it works.
This video sorted out my rich jetting issue! Many thanks !
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
You've put together an awesome channel. I think I've saved at least 50 videos to get back to. Thanks much!
That's awesome to hear, thank you!
Thank you so much man !!! Great explanation !
Well done . best and simplest explenation so far.
Outstanding video, thanks for doing that!
Very discriptive and makes a ton of sense.....thank you sir
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 🎩
Thank you for the comment!
Finally an explanation that I could understand. Thank you sir
Great explanation, very simple.
Awesome video.... Keep them coming
This helped a million! Thanks!
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...
Fantastic explanation!
thanks for this detailed video on the emulsion tube and the fuel level. May God love and bless u!!!
Thank you my Friend.
clear, concise priceless exlplanation thanks
Fantastic simple & concise tutorial. Thanks bro. Big help
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...
Great job man. Well done, clear explanation.
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.
Nice one. Clear & concise tutorial
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.
Hi Richard I totally agree with your comment. I thought it was just a reserve of fuel waiting to be used.
We learn everyday.👍
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.👍👍👍👍
Great video. Thanks!
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.
Good point on the plunger, I went over it in another video, thanks for watching!
great first one with super explanation.
Thanks for watching!
Good explanation, sir! Very much appreciated.
finally i understand how to adjust float height properly without having a spec manual.
Thanx for sharing knowledge...
Excellent, thank you!
New knowledge for me, thanks sir
Really great advise there. Nice going.
Great video- learned a lot
good video, straight forward and helpful.
Great job I finally understand somebody
finally I´ve understood the system, thank`s v.m. Thomas
Great video..👍🍀🇮🇪
Well there you go. I will now fix the rich mixtures on my dt200r. Thanks heaps.
Thanks....clever little devise the Carburetor.
Yes it is.
Thank you sir, from Lake Havasu City Arizona
Thanks for watching!
Thank you. Great explanation. 😎
Now I can sleep thank you 🙌
Very helpfull..thank you sir
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???
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.
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
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.
Great video, thank you
Great thanks for the explanation understood everything
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!
Your welcome, carburetors are awesome things.
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
Very helpful thank you sir👍🏻
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
Great explanation!
Excellent 🔥
Nice explanation!
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.
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)
thank u ....woow it is awesome
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
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.
Omg thank you so much you just saved me hours and money your the shit
Good explanation
This really helped !! Thanks I adjusted the tab wrong and it flooded
I’ll level out the tab and see if that corrects it
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
Thanks dude
awesome
u r the man
Excellent video. Concise, illustrated and well narrated. Even after rebuilding a 1000 carbs I learned something. Bravo!
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.
Heck yeah, get it dialed in!
Thanks great video and to the point-don't know how you can take the cold-your pretty tough.
This was good
Thx
Mate very good! Bob 🇧🇪🍺Belgian
😄 These floats have been a pain in the ass, but Thank you, this has been helpful
Thanks this is great.
One question though how do you know when to lower float level (more fuel) or increase jet size (more fuel)
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!
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...
Thanks
great
Thanks a lot for the enlightenment
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.
Perfect timing, I just put this video out. Should answer all your questions.
czcams.com/video/CQm_bs0uiTw/video.html
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…
@@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.
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?
Float height should always stay the same no matter the jet size.
@@TepcoCycleRepair yeah obvisouly ! got confused for a minute, thanks for making it clear !
Best video about carbs
Thanks for watching!
Thanks for watching!
I will sleep well now,thanks bro!
can you help me out? I have a 150cc bike which I converted from CV carb to Round Slide carb
the problem is no matter what I do
change the jets, needle clip from top to bottom
it always fouls the plugs
Thanks man awesome explanation!
Thanks for watching!
float level affects hill climbing with a dirtbike?
@@HaXeDick No it shouldn't. The proper float level should be able to handle any hill you throw at it.
@@TepcoCycleRepair Thanks man :)