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How to adjust motorcycle carburetor floats.

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Just a quick demonstration of an easy way to adjust your motorcycle carb floats. If you are experiencing overflowing carbs, or if your bike is a little hesitant to take off when you flick the throttle, it might be time to doublecheck your float heights.
Category: Транспорт
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Text Comments (137)
Joshua Milhouse (2 years ago)
Would 14mm be the same for the 88 fzr 1000 i cant find the float height for the 87-88. the 89-95 is 12-14 mm
mrmaxstorey (2 years ago)
Unfortunately I can't confirm that. Youll have to find a repair manual
jeff silvia (2 years ago)
plastic piece on the main needle is loose on the main needle
can you please let me know how to correct floating level of Honda Magna VT250 carburetor
mrmaxstorey (2 years ago)
Sorry dont know check your repair manual
Jeffrey Benoit (2 years ago)
Have a 1971 Honda 175 that has been sitting for a few years, when i turn the petcock to on gas runs out of the overflow tube on the right carb. Any ideas how to correct this? Thank you.
mrmaxstorey (2 years ago)
Yeah check out my video on repairing leaking carburetors
Alec Schaffer (2 years ago)
thanks for sharing your wisdom man I just Got a bike finally got it started but of course something else has to happen and now I'm leaking gas like a sumbitch
Yoyosten99 (3 years ago)
Bought a bike, the carbs had a slow leak, took them apart cleaned, adjusted floats with a bike master tool. Measured to oem specs. Hooked back up to an auxiliary tank to tune and they just dump fuel now. what gives?
mrmaxstorey (3 years ago)
+Yoyosten99 One of the floats or float pins is stuck open
Kendric Smith (3 years ago)
Trying to hold it with three hands wait wat
Charles Roberts (3 years ago)
I have a 1984 kawasaki ltd 700 and would like to know what the float level is supposed to be on the carbs. Do you have any idea what they should be set at?
Charles Roberts (3 years ago)
+mrmaxstorey I don't have a repair manual for it. But thanks anyway.
mrmaxstorey (3 years ago)
+Charles Roberts Your repair manual should be able to tell you
Dee Bo (3 years ago)
+mrmax....coming from bottom left...but i cannot see the top of the carbs due to the tank sitting on top. im going to take off the air box and lift the tank and see if its comin from top.....but its leaking from the same exact place before i rebuilt the carbs
Dee Bo (3 years ago)
mrmax.....i watched your gas leak carb video..mine was leaking the same....i put new o rings ...carb gaskets and new float needles in all 4 carbs and i have the same leak still....any suggestions from here out ? i didnt see any cracks in the float housing /cover. i rode it all summer and just started leaking. only leaking from left side carb . not the other three...any suggestions
Mistah_Sinister99 (2 years ago)
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mrmaxstorey (3 years ago)
+Derrick Bowermeister Where exactly is it leaking from?
Lee Skinner (4 years ago)
I have a 1977 yamaha xs4 175cc enduro is it a two stroke or four stroke engine ?
mrmaxstorey (4 years ago)
@Lee Skinner Probably a 2 stroke. Check for the external oil reservoir under the seat, if it has it then it is 2 stroke.
Ryan Bell (4 years ago)
Hi, just wondering if you would know anything about my bikes problem. It tipped over one day and ever since it hasn't been running properly it runs fine in first gear but the second i change out of first it start spluttering and losing power as if its not getting enough fuel or too much fuel. Do u think this could be because the float heights are knocked off when it was on its side?
mrmaxstorey (4 years ago)
@Ryan Bell Definitely possible
Rusty Nails (4 years ago)
I opened up the carbs before installing them and they were nice and clean. I removed the air box on my bike with the old carbs and put pods on and the pipes have holes drilled in the baffles for a throatier sound. It ran great with the stock carbs after being synced this way.  I opened up the fuel screws to 3 full turns on this set and it runs good after it warms up a bit, but until then it idles low. At times it seems to get stuck at a higher idle and then I let off the clutch a bit and it drops back down to where it should. I'm not a mechanic but I've done all I know to do except using a sync machine which I don't personally have.
keep it moving (1 year ago)
A hanging idle ( high idle than drops) is called lean fuel mix. you need jet kit
mrmaxstorey (4 years ago)
@Rusty Nails I see. I find it surprising that you ddnt need to rejet your carbs after doing those modification
Rusty Nails (4 years ago)
I ended up replacing the carburetors with a better set of used ones and they have an idle issue as well and can only think they need to be jetted/synced with a vacuum sync machine. Other than that the bike runs well and starts up just fine. Could what I mention be the problem/solution?
mrmaxstorey (4 years ago)
@Rusty Nails If your bike is set up with stock intake and exhaust then the jets should be the stock sizes. Therefore no jetting required. As for a sync it might help you should sync the carbs after every time you service them, however your new set might also need some cleaning, float heights set as well
communicate17 (4 years ago)
Good explanation
Rusty Nails (4 years ago)
Could a stuck float and needle cause idle problems? I've cleaned the carbs thoroughly and used float needle, gasket, etc rebuild kits and noticed one of the floats occasionally sticks. I thought I fixed it and re-installed the carbs but my idle goes from 1100 rpm to a stuck 3000 and I don't know what else it could be.
mrmaxstorey (4 years ago)
Yes absolutely you gotta get that thing working right
john miller (4 years ago)
about the needle, while adjusting my float height i noticed that there is approx. 1/16" to 2/16"th of a gap between the tang on the float and the wire on the needle valve that slips over the tang.  When the float travels its full distance, closed to opened, it appears that the spring loaded needle valve opens/closes just fine, however the needle doesnt move within the needle seat.  I would expect the needle to move slightly from closed to open!?  The wire that slips over the float tang is actually 2 independant wires that meet in the middle over the top of the tang on the float.  Im guessing that these wires are out of adjustment.  Im inclined to bend down the 2 wires that slip over the tang on the float, to close the gap and allow the needle to open/close within the needle seat.  I am riding a 1998 Suzuki VZ800. Also, in your experience could the tang on the float become bent and out of adjustment due to a crash?  I recently learned the lesson of cold tires on a cold road, lost rear traction when i gave it a little throttle and went down like a load of bricks at about 30-35mph. Thanks bro!!
mrmaxstorey (4 years ago)
Yes float heights can be knocked off due to a crash. If you want to mess with those little wires you can, just make sure it operates ok
Brad Wilde (4 years ago)
Nice Video. Easy solution to what looked like a daunting task.
snoopindaweb2 (4 years ago)
Barcode = great idea, that can be used in a lot of situations as always, thank You again.   ~:- }
Did u watch the video? It was one of the first things he said...
mrmaxstorey (5 years ago)
What kind of bike?
Sylvester (5 years ago)
Hi, the engine starts without problem and very smooth until reaches 6-7000 rpm, above that starts to "shake" and only with full gas goes up slowly, but I can hear it`s not normal at all.
mrmaxstorey (5 years ago)
Your engine's shaking like crazy? Maybe you have bad engine bearings?
Sylvester (5 years ago)
Hello mrmaxstorey, my engine doesn't want to rev over 6000rpm, only if I force it for seconds and goes up slowly,but engine's shaking like crazy! Jets holes are clean.Can be float height? Thanks
The X KeyBlade (5 years ago)
THANX MATE HELPED ALOT WE ADJUSTED THEM TO THE RIGHT MM AND IT RUNS SMOOTHLY JUST HAVE TO WAIT TILL THE MORNING ONCE ITS COOLED DOWN TO SEE IF IT STARTS ON A COLD START OK
Hypnotized81 (5 years ago)
Thanks man. I'll do that.
mrmaxstorey (5 years ago)
Definitely. I have repaired to fully functional capabilities some of the most horrible carburetors you can imagine. Try to work on it yourself, you'll get it
Hypnotized81 (5 years ago)
Hey man nice vid. My carb float seems to get stuck making my bike turn off and impossible to restart. My mechanic says I should change the whole carb as he can't guarantee to repair it successfully. ' You think he is trying to reep me off?
mrmaxstorey (5 years ago)
Could be. Could also be vacuum leaks, or valves out of adjustment
Jenixon Lim (5 years ago)
Hey man, My RVF400 won't idle by itself when cold, I have to start it and ride it, and after 5 minutes then it'll idle by itself, I've been told it might be the float heights but I've had the carbs rebuilt twice already! Could it be float heights?
willhelmous (5 years ago)
it's the thin copper pipe about 2 inches long on the side of the carby, it's right neer your thumb.
mrmaxstorey (5 years ago)
Could you be more specific?
willhelmous (5 years ago)
The pipe line near your thumb. What is it?
mrmaxstorey (5 years ago)
Umm no... but some carbs sit nearly sideways compared to other carb configurations, just depends on how the manufacturer made them
nineball26 (5 years ago)
what the, your carbs sit upside down on your engine?
mrmaxstorey (5 years ago)
How is the fuel flow from the petcock? You might have a clog there, or a clogged fuel filter, etc. Its unusual that the problem is in the carb, especially since your carb is new, but check the whole line for clogs
Epicsoulgaming (5 years ago)
I think i have to problem with my float bowl on my aerox, i installed a new 17.5mm carb and it feels like the bowl isnt filling up fast enough, it will set off full speed and then after about 5-6 seconds of going about 30 mph it will just drop and won't have any power. i will leave it for about another 5 seconds and it will do full speed again but just drops power again after 5-6 seconds of riding. ?? help please
mrmaxstorey (6 years ago)
What makes you think its the float needles? Sometimes the little breather hole in the fuel cap gets plugged, so you get a vacuum created in the tank that doesnt allow any more fuel to flow after a short time. Re-assemble everything, open up the cap, and see if this improves your running condition. If so, you just need to replace your cap
scrambler250r (6 years ago)
Hey man, I have a ? maybe you can answer. 99' Yamaha R6, starts easy cold, will not idle! & hard to start hot. Well I got fed up with it, was going to store it so took the tank off to let it run out off gas. With the tank off & the fuel pump not being able to pull any more gas, she sat there & idled like a brand new one until it ran out of fuel. Long story short I think my needle valves are bad. I would love to have your thoughts on the subject, Thank you. Nate.
mrmaxstorey (6 years ago)
That duct tape test is not a reliable way to tune your bike. Similarly, even though increased float heights will make the bike run richer, it is also not reliable and not a part of the tuning process. First, you gotta make sure your carbs are spotlessly clean, then you adjust your jets and slide height until you have smooth power throughout the powerband. My video on adjusting carb jets demonstrates the process
Sam Flores (6 years ago)
Jet.
Sam Flores (6 years ago)
I have 4 single pod filters the kind you get on ebay. I seen a blog that suggested that to test if I'm getting to much air wrap most of it up with duct tape? Do you think float adjustments play a role in bogging out or the main her is dirty?
mrmaxstorey (6 years ago)
What intake mods does it have?
Sam Flores (6 years ago)
Hello Mr Max I have been following you for a while now I have a Suzuki Bandit 1200. The bike starts up nice takes off okay, but when I go 80 and turn the throttle to boogie it hesitates and sounds like its skipping I don't know if its not getting enough air or drowning in gas? It has a stage 3 jet kit.
mrmaxstorey (6 years ago)
ok
bhills73 (6 years ago)
over the next 8 or ten days I am going to load some videos. just let me know what you think. thanks r8adian6
ThrasherGnar (6 years ago)
Thought you might enjoy this...search "Balancing Carburettors with home made manometer"
mrmaxstorey (6 years ago)
Its unlikely that the float height will be the same. Check out my other video on checking float heights with the clear tube, it might help you out.
Redstonellama (6 years ago)
Hi there great video, wondering if you could help me I have a tdm 850 1991 and carbs look identical to your video do you think mine would be set at 14mm too? The manual only says how to check fuel level with clear tube on drain plug while still on bike I've tried and tried but fuel still keeps on flooding out many thanks.
LAMEST LaME (6 years ago)
Thank you very much! That video really helped.
mrmaxstorey (6 years ago)
Could be, or the needles, float chamber, or float pin might be dirty and in need of replacement. They are all locatedright around the same area so its easy to check. Go to my channel and look at my video on leaking carburetors for a better explanation
LAMEST LaME (6 years ago)
Thanks I am not very good with engines. In your opinion would the floats filling with gas be the reason my carbs are flooding when attempting to start my boy?
mrmaxstorey (6 years ago)
If your floats fill with gas then they have to be replaced
LAMEST LaME (6 years ago)
The floating part in my carburetor opens and fills up with gas is there anyway of closing it or is it supposed to be open? Just bought the bike two days ago but it wont start up because the carbs just flood.
mrmaxstorey (6 years ago)
Not if you do a good job on it
drew robert Fickett (6 years ago)
If I sync everything on the carb myself will I have a problem with my bike running good?
mrmaxstorey (6 years ago)
No they are FZR 1000 carbs
nitesh beegun (2 months ago)
Hello bro am from mauritius what if the float does not have same level on both side of it. Then which side of the float to take into consideration to measure level
hi! Is that carb of a bandit ?? tell me is 14mm ise standerd for that carb??
groutaone (6 years ago)
You are good at making vids, thumbs up from me
mrmaxstorey (6 years ago)
I don't know what your float height is man, you gotta look that up in a repair manual
Stephen Mc Grath (6 years ago)
1992 kx 250 with dellorto carb, flooding after a kick or two. what i set the float to my leg is going to fall of
mrmaxstorey (6 years ago)
Without any tools its hard to help you out. If you could take the carbs off and take them apart I could walk you through the process of looking at what hes done, and doublechecking his work. Since not, I say get your money back or hold him to his work
Kirk Conway (6 years ago)
I could use you here guy, ive got a 92 Nighthawk 750 spent 265,00 on it to get carbs done and jetted to no avail still has flat spot on takiing off,and spits and runs rough at med rev's, pops and backfires on throttle let off. no shop tools would gladly pay a guy to do this right,
mrmaxstorey (6 years ago)
Im not sure off hand, your repair manual can tell you
MrRAXY888 (6 years ago)
max whats the float height recommended for gsx400f?
mrmaxstorey (6 years ago)
Typically, if the floats stick even a little, it will cause you problems either with flooding or fuel starvation. Do everything you can to smooth that out
dalessio32 (6 years ago)
I've been cleaning out an old set of Mikuni VM29 carbs for the first time. They have brass floats and I'm noticing when they're pressed with my finger the very end of the float sometimes catches and sticks to the adjacent metal surface. Should I be worried about this under normal riding conditions? Or is the pressure from my finger more than anything the floats will ever experience while bouncing up and down on the road?
Cindy Hinsch (6 years ago)
Thanks a lot again!
mrmaxstorey (6 years ago)
Yeah the one in my video with the 4 dials is universal to pretty much every bike, should be fine for you
Cindy Hinsch (6 years ago)
Hi from Cindy again...The carburetor synchronizers available on e bay are varied. I don't see one exactly for a yx 600 cc yamaha like I have. Can I buy one like yours for a honda 550 or should I opt for the one that is engineered for a yamaha 650? Does it matter that much. If I get good at this I will want to try purchasing and fixing another bike and will want a compatible synchronizer for lots of bikes. Thank you again, Cindy
Kyle Baker (7 years ago)
If it's off too much, though, your bike might run lean and not be easily adjustable; too high, and the level can overflow into your airbox, and if your oil overflow is also into your airbox, you can get gas in your oil, leaning it out and not letting it properly lubricate.
AuAsEz (7 years ago)
Cool keep up with the good work.
mrmaxstorey (7 years ago)
I cover all of that in other videos. This one was just on float height adjustment
AuAsEz (7 years ago)
You forgot to mention that you should pressure test your needle n seat to check if there leaking or not.For Carb packs you want to sync. them after installing to get peak performance with a mercury gauge.To get right float adj. angle carb'"s" slightly intell float tab rests against needle pin and even with carb housing bowl surface general role of thumb.
mrmaxstorey (7 years ago)
You are looking for the little rectangular pin with the pointed end that sits underneath the float. It moves up and down when the float goees up and down. And to answer your second question, nothing. Close enough is close enough, doesnt have to be perfect down to the nanometer.
Winddrifter86 (7 years ago)
1st i'd like to start off by thanking you by making so many videos and inspiring me to work on my bike! 2ndly this is the part that worries me the most. I have a V65 Magna with a float level of 6mm, What needle are you talking about? on the float valve? and whay could happen if the float height is off in the slightest?
mrmaxstorey (7 years ago)
Raising the float level will enrichen your mixture, but its not a common adjustment point as I understand it because it is difficult to get consistent. The float level is always changing, and reacts to bumps in the road and banked turns, so I never use it to adjust the mixture. I would suggest you put the screws back to close to stock, get smaller sized slow jets, and larger sized main jets. Sometimes the jet kits do not supply the correct size jets for your application. Message me for more help
Nick Wrubleski (7 years ago)
im confused what point you measure to?
mrmaxstorey (7 years ago)
Shes a tough ole girl
Chucho Chucho (7 years ago)
Don't spill any gasoline on that poor dog, I know they like to be right there with you, mine use to get next to me and make contact with my body while I was fixing something underneath my car, haa ha haa, my good buddy Lucky Boots!
Seldian (7 years ago)
Go look for carbs for your year bike online, see if they are for 92's as well.
mrmaxstorey (7 years ago)
Thanks dude
boondockdread (7 years ago)
max makes the best vids
mrmaxstorey (7 years ago)
Probably, but im not for sure
Jeffery Brown (7 years ago)
Hey I have a 93 cbr 1000f. Can I put a 92 cbr 1000f carb in it with out any problems? In other words, are both carbs the exact same? thanks
mrmaxstorey (7 years ago)
No, this bike has a different configuration from some other inline-4 engines, the venturis point almost straight down. The angle you want to hold your carbs at is different on many different bikes, basically you want the tab on the floats to be touching the needle, without compressing the needle spring
mrmaxstorey (7 years ago)
Well, sort of. You should really only need to clean your carbs maybe once or twice in a bike's lifetime if it is well maintained and used regularly. If you are bringing a bike back from dysfunction, you might as well adjust the floats while you are in there because you never know what the previous owner did. Cleaning carbs is not really a part of routine maintenance, and neither is setting the floats, but if a bike is not running right it is something worth checking out.
Jeffery Brown (7 years ago)
So, every time you clean your carbs, do you suppose to adjust your floats?
mrmaxstorey (7 years ago)
@seanyounk1 Thanks they are my favorite pair
Sean Younk (7 years ago)
Nice boots!
mrmaxstorey (7 years ago)
@southcoastsinner Swaps like that are always pretty tough, id be impressed if you got that thing running and idling like new. Best guess for your problem would be that you are running too rich or too lean, pull your plugs and see what they tell you, you may have to rejet
mrmaxstorey (7 years ago)
@fritziv No. All bikes are different.You need to find the specific height for your bike
Ian Velasco (7 years ago)
14mm height is the standard?
mrmaxstorey (7 years ago)
@E3lcpl Yeah I have a video on carb adjustment, but I demonstrate on a gsxr the needle just falls right out. Lots of bikes have different needles with different clips, best to look in your repair manual for how it releases.
E3lcpl (7 years ago)
got a 98 vtr 1000 i need to change the jet needle height, but can get the needle out? you got a video on how that comes apart ?
e_93 (7 years ago)
Great videos. Thanks man!
mrmaxstorey (7 years ago)
@suzuki85racer Go to my channel and check out my video on fixing leaking carbs
mrmaxstorey (7 years ago)
@TheMarilynndNatShow Could be, a piece of gunk from the bottom of your tank may be keeping the float needle open. Time to take your carb out and clean it.
nat bo (7 years ago)
I have a KX 250. Just the other day it was running good but i ran out of gas completly while riding. I added about a gallon of gas the next day and now its revving like no tomorrow. I assumed it would be to much gas in the carb so i tryed leaning it and turning it on and still the same. It just revs and revs. Could it be a problem with my floats or what could it be? Thanks dude
mrmaxstorey (7 years ago)
@warder105 Lol if my brain can do it, yours can too

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