How To Set and Adjust the Carburetor Float Height on a Motorcycle, ATV, or UTV

Carburetor Float Height Tools & Accessories: www.rockymountainatvmc.com/Sa...
Having the float height correctly set in your carburetor is an important factor in your fuel system which ensures your engine is getting the right amount of fuel. Tearing into carburetors is often seen as a daunting task but with a little know-how, getting your carburetor float height set can be a simple task. Take a closer look as Charles shows how to properly set and adjust the float height on a motorcycle or ATV carburetor.
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[@scottgreenland3539]

thanks for your help! id be lost without KZbin videos nowadays! I actually had to buy a manual and take the time to read it and cross reference to get almost everything done. thanks again and keep up the great work

[@rmatvmc]

Nice job! Glad we could help!

[@romper4444]

You guys do the best instructional videos, very precise and clear info, great focus on closeups. Very professional production quality. I wish all tech tip vids were like this! Keep it up!

[@nastysoda9212]

thank you! Carbs used to be a total mystery, now after cleaning and rebuilding them, it's all coming together.

[@leonardovillalba881]

Thanks for the video fella, I just fixed my dirt bike after months of trying and failing. All the best

[@inthelandofmilkandhoney457]

FINALLY….a well detailed and explained video on float height settings. Excellent. Thank you 👍👍👍

[@kylehughes3850]

Fantastic instructions very clear to someone like me who can struggle to understand things sometimes as people go too quick. This a patient good clear instructions 👌👌👌

[@Natedoc808]

Best video I've ever seen showing this process. Thank you

[@Jursaw]

I really enjoyed this thorough explanation . Also helpful that you showed 3 different ways to measure and adjust float height

[@rmatvmc]

Glad it was helpful! Thank you for checking out the video.

[@erwinvb70]

Thanks for the clear explanation and good video quality, this is very useful

[@cornpuff9532]

Perfect. What I was looking for at 5:00. Thanks!

[@chuckufarley2005]

Thank you very much. Now I hope I'm reading my dial indicator correct! I have a 1996 Suzuki Intruder front carb 0.40

[@martinsims1273]

Thank you. Very clear and easy to understand. 😊😊😊

[@jensmrch4720]

Great vid. Thanks god to know, I have at bike with a rich running condition, now I am forging to fix it I hope.

[@westmetal17]

Your tech tips are life savers!

[@brentmaveric4981]

I wanted to watch a video on how to put it back together cuz I just took it apart and cleaned everything so thanks for your video

[@bige65168]

Excellent excellent video!!! Great instructions, thanks for posting!

[@jimmyhygaard2252]

Yeah,I completely agree,checking the float height is vital,my bike has a 20000 rpm so I think float height is vital,it is a 1987 Suzuki GSXR 4 cylinder,thanks.

[@paulgee5068]

Very educational big thanks for sharing this imformation great video btw 👍

[@mestep511]

Nice video. Settles the confusion

[@michaelpigeon3591]

Great Video well explained.

[@adilshahkadri]

Very informative. Thank you

[@at1asru]

very usefull!!! thnx man!!!

[@kadel1247]

Thanks

[@GrassBeetle]

best instructional!

[@DasSaren]

Lifesaver!

[@occrc3333]

You saved the day!

[@gazzy555joker6]

Thanks for helping me do my float heith

[@robertwoods2505]

Very helpful video. Thank you for sharing it.

[@nainka11]

Well done.. Thank you... but I'm a little thrown about the float height affecting the mixture... how so ?

[@juhaposo5742]

Thanks for this video - it has been a nightmare to find some knowledge how to adjust the floats of my 1974 Yamaha RD 125 finished resto. It's almost impossible to find any motorcycle service in Helsinki, who can do/ or even know something of adjusting old 2-strokers carburetors.

[@twist_08]

My only question is with the tube test how would you go about adjusting it? If the fuel is way under the line would you set floats higher?

[@fireant5225]

If it’s set way off will it prevent the motor from running, or cause it too crank and then go dead after a second or two?

[@jojojeep1]

Hey friend, I have a VM 22 clone carburetor on my sons mini bike. The brass tube on the inside of the bowl that makes it drip if it’s too high, that brass tube is level with the gasket. I set my float so it is 25 mm below the little brass tube, so when I check The gas level with the tube it sits 25 mm below the seem or the gasket , I hope that is correct. It calls for 25 mm. Please let me know thank you

[@legacy_gaming7722]

I am super lost and don’t want to mess this up could I please get help by someone when knows what todo

[@anthonyshaeffer7889]

Great video except I dint see the float height on the chart. Riding at 5-10k feet. I just set mine at 8mm. Thanks

[@jeremy22b]

I hope this helps prevent gas from leaking out the overflow tube. I've cleaned and replaced parts that hadn't helped.

[@krookedENT]

Did it help

[@jeremy22b]

@@krookedENT No, it didn't help. I now assume the float level is off. Which way do I bend the metal tab to reduce/stop gas from flowing out the overflow?

[@shanemyers4142]

Love your vids brother. I took the carbs off of this v twin. I made sure diaphragms, jets, gaskets, needles, and all were good. Put them back on and still dies upon throttle. After checking everything numerous times, and replaced all lines, it still dies upon throttle but only revs up if I spray the carbs. Could a float out of adjustment cause bike to die upon throttle but still idle? Only revs if I spray the carbs. Any help appreciated. Thanks for the vids.

[@3000ryu]

My guess is it could. If the float is set too low it's not getting enough gas in the bowl to handle throttle but could handle idle. My problem on my KLR I'm thinking is the it's set too high and it floods the carb which makes gas go out the overflow.

[@CarlosManuel-zm1yc]

I adjusted my float bowl and now the manual choke won't work on cold start I have to give it gas to fire up also the plunger has no spring/ nakuru carb 50cc fuel only carb/ idle and fuel air mix screws

[@marccawood]

How does float height affect the mixture? I thought the jets and adjustment screws control that. I had always assumed the float height is just about keeping the chamber filled so the jets are submerged during rocking of the bike.

[@000reizer7]

X2

[@markcerundolo7898]

It’s more so if it creates a lean condition. If the bowl isn’t filling, it runs lean.

[@ryanhowell8103]

Less fuel in the bowl = less fuel agitation = less excess fuel up to the venturi.

[@glennyj65]

gravity, column height, bar.

[@henrysmith8012]

You dont have to have all that to set float height. Length of see through Tygon tubing placed on drain nipple on float bowl. Never fails, spot on. Finally a video that's shows the correct way.

[@labasrytas2876]

the problem is- you still need to know at what level fuel need to be- i cant find it anywhere for mikuni tmx 38 carb... :(

[@rickkramer4504]

@@labasrytas2876 isn't it 10mm above float bowl flange/gasket surface, thats what manual says i believe

[@zaczito6698]

Having trouble finding the correct float height for my 96 yz125 can anyone help me out?

[@hairyknuckle8603]

Do you have a pwk 38 carb? I’ve been having the same trouble got a full rebuild kit on eBay but I didn’t get a new float just needle valve. What are you having trouble with?

[@sksjsieejueuro9177]

Why does my carb leak

[@piercer4882]

Can float level lead to plug fouling?

[@rmatvmc]

It can, but it's more likely to have something else going wrong. Make sure the you have good compression and spark and the right spark plug. As long as those are good, verify the float height is correct, then work on your jetting. (make sure the air filter is clean and in good condition.) -Charles

[@thebeddoctor4273]

What causes the gas to spill out the over flow constantly? Too high or too low float?

[@rmatvmc]

If the float level is set too high, that could cause fuel to come out of the overflow.

[@thebeddoctor4273]

@@rmatvmc thanks

[@thomasgapa7977]

6

[@MysteriousOoze]

My bike idles low and then stops when I rest it on the kick stand. It sputters a little in the hills an won't idle on steep inclines. But it runs like a train on flat ground. New carburetor. Could it be the float height?

[@glennyj65]

yep. set float to shut off sooner

[@thatsallfolks3115]

Does Rmc sell owner manuals , for 97 yz? Or can anyone point me in the right direction.

[@kawi5827]

Ebay

[@MikeSmith-nu9wt]

Ooh, I forgot , the kits usually came with a cardboard gauge to measure the float height also ..not no more though ..its made by corperate, and they could care less about customers , they already got your money ..

[@jamie81972]

I got an 84 cb650sc and the floats and where they attach to the needle valve is completely plastic. How would I adjust those?

[@rmatvmc]

There’s a small metal tab that rests against the needle. To adjust the level, simply bend the tab and then check the float level.

[@emiliol4622]

👍👍

[@tsoliot5913]

My god, dude, heighth is not a word

[@ossomzachariah]

Please my motorcycle atv sound like the airflow is blocked but as I move for sometime then the speed come back to normal and speed well but If I lowered the acceleration and raised the speed again the same problem come back again please help me

[@rmatvmc]

Have you looked at your jets inside the carb? Sometimes those can get partially clogged and exhibit some of the symptoms you're experiencing.

[@GASSmallEngine]

What's the name of that tool you used at 7mm to verify float height?

[@rmatvmc]

That's the K&L Digital Caliper. You can click the first link in the description to check it out and the other tools used in this video.

[@romper4444]

Its just a vernier caliper, but a digital one. U can get them at any parts or hardware store like a home depot, napa etc. 15bucks

[@henrysmith8012]

All you need is a length of Tygon tubing you can see through. Place it on bowl drain nipple, hold hose up beside fuel bowl, open drain screw, the fuel level in the hose will be the same as level in bowl. Make sure there are no air bubbles in the hose. You can move the hose up and down, does not matter, level remains the same. Simple physics. I like my fuel level just at or under where the bowl meets the carb housing. You dont need any fancy tools or gauges. You do have to have a fuel bottle that you can hang up above the carb. I clamp my carbs in a table vise. This way you can leave carb sitting with fuel loaded against the float needle all day to check for leaks and test the float needle to see that its holding and not seeping fuel, flooding. I do carbs almost daily for years, this is the best way and easiest to bench test float level. The more fuel you have in your test bottle the better.

[@jongearhart1359]

If the float height is off will that make it spill gas Into the breather box

[@AlloyedFrequencies]

I think so. That happened to me

[@jongearhart1359]

@@AlloyedFrequencies could also be ya have your lines hooked up wrong too which is what happened to me

[@AlloyedFrequencies]

@@jongearhart1359 Thanks, I'll check

[@thomasgapa7977]

5t

[@zachmeyer620]

What if i have a plastic tang on my float instead of a metal on?

[@rmatvmc]

If your float is completely plastic it cannot be adjusted and a new float would be needed.

[@kx1008]

👍🏻👍🏻👍🏻👍🏻

[@SuicidalEnduro]

Height… i swear he says heigth EVERYTIME

[@thomaspudney7272]

I hear it too

[@Stupidvids123]

Lisp? Lol

[@WestHaddnin]

He definitely “thaid” it. He’s a thilly gooth with a lipth.

[@michaelgarland579]

My float stays down an won't come up

[@rmatvmc]

Hmm, is it brass? Could have a hole and be full of gas. Or do you mean it's frozen in that position? -Charles

[@RM-mr1mc]

height not heigth

[@byrek8975]

Heighth

[@rmatvmc]

😂😂

[@briholt100]

good info...just a nit-pick...it's not pronounced "higth" but "hite"... with a hard "t" at the end.

[@rmatvmc]

Thanks for checking out the video and leaving a comment!

[@j_wal_0273]

Heighth? Flow heighth?

[@lk6912]

Speakth englith??!?!

[@LiveNowBeFree2]

@@lk6912 someone didn't get the joke 🤌

[@NickW90]

That drove me nuts lol

[@RiderDown181]

Float heighth? Kinda like thread depth right?

[@demwillams8898]

I can't take it. "Heighth" please make it stop.

[@drwinlied]

"heighth" "heighth" "heighth" OK THAT'S IT! I CAN'T TAKE IT! I'M OUT

[@HESS50102MUSTANG]

Height not heighth can’t watch your video if you can’t pronounce a simple word you learn in 1st grade

[@dougyoung221]

Thanks

[@tommydoolittle8456]

7