thanks for your help! id be lost without UA-cam 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
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!
I just wanted to commend you and RMATV UA-cam channel for presenting the most informative and well delivered content I've found anywhere online. Your efforts and attention to detail are much appreciated and a great help to all DIYers who want to do their own maintenance. Thanks so much!
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.
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 👌👌👌
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.
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.
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
I would be happy to receive your help on a problem I have with the carburetor as soon as I start the motorcycle I have a leak from the excess pipe I did a test and all the signs indicated a problem with the float or the valve after countless attempts that failed to solve the problem I decided to replace the carburetor and after the replacement the carburetor was on another motorcycle And it was normal. But my motorcycle again had leaks from the excess pipe, do you have an idea or a solution to the problem
@@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?
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.
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.
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.
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
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?
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?
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
It could, but it is more likely that your needle and seat are damaged and leaking and instead of going through the overflow the gas might be going into the cylinders and draining through the rings into the crankcase.
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 ..
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
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.
thanks for your help! id be lost without UA-cam 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
Nice job! Glad we could help!
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!
I just wanted to commend you and RMATV UA-cam channel for presenting the most informative and well delivered content I've found anywhere online. Your efforts and attention to detail are much appreciated and a great help to all DIYers who want to do their own maintenance. Thanks so much!
Thank you for the kind words! We're glad you are finding our videos helpful, and appreciate the views!
thank you! Carbs used to be a total mystery, now after cleaning and rebuilding them, it's all coming together.
Thanks for the video fella, I just fixed my dirt bike after months of trying and failing.
All the best
FINALLY….a well detailed and explained video on float height settings. Excellent. Thank you 👍👍👍
Great camera work and explanation. Always love the Rocky Mountain quality videos. Thank you!
Glad you like them! Thanks for watching!
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.
I really enjoyed this thorough explanation . Also helpful that you showed 3 different ways to measure and adjust float height
Glad it was helpful! Thank you for checking out the video.
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 👌👌👌
Thanks for the clear explanation and good video quality, this is very useful
Best video I've ever seen showing this process. Thank you
Nice video. Settles the confusion
Thank you. Very clear and easy to understand. 😊😊😊
Great vid. Thanks god to know, I have at bike with a rich running condition, now I am forging to fix it I hope.
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.
X2
It’s more so if it creates a lean condition. If the bowl isn’t filling, it runs lean.
Less fuel in the bowl = less fuel agitation = less excess fuel up to the venturi.
gravity, column height, bar.
Your tech tips are life savers!
Perfect. What I was looking for at 5:00. Thanks!
Very educational big thanks for sharing this imformation great video btw 👍
Thank you very much. Now I hope I'm reading my dial indicator correct! I have a 1996 Suzuki Intruder front carb 0.40
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.
Well done.. Thank you... but I'm a little thrown about the float height affecting the mixture... how so ?
Very informative. Thank you
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?
Super helpful! Thank you!
Glad you found this video helpful. Thanks for watching and the feedback!
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
Excellent excellent video!!! Great instructions, thanks for posting!
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
You saved the day!
I would be happy to receive your help on a problem I have with the carburetor as soon as I start the motorcycle I have a leak from the excess pipe I did a test and all the signs indicated a problem with the float or the valve after countless attempts that failed to solve the problem I decided to replace the carburetor and after the replacement the carburetor was on another motorcycle
And it was normal. But my motorcycle again had leaks from the excess pipe, do you have an idea or a solution to the problem
I hope this helps prevent gas from leaking out the overflow tube. I've cleaned and replaced parts that hadn't helped.
Did it help
@@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?
@@jeremy22bWas your carburetor leaking from the overflow tube even with the floats adjusted correctly?
Great video except I dint see the float height on the chart. Riding at 5-10k feet. I just set mine at 8mm. Thanks
best instructional!
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.
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... :(
@@labasrytas2876 isn't it 10mm above float bowl flange/gasket surface, thats what manual says i believe
I am super lost and don’t want to mess this up could I please get help by someone when knows what todo
I got an 84 cb650sc and the floats and where they attach to the needle valve is completely plastic. How would I adjust those?
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.
Is this work on 50cc 2 stroke scooter?
Pressing down brings it up and vice versa??
I would think it would be opposite?
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.
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.
What causes the gas to spill out the over flow constantly? Too high or too low float?
If the float level is set too high, that could cause fuel to come out of the overflow.
@@rmatvmc thanks
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
Do anyone have service manuals for Keihin PWK38? I can't find it anywhere, and my bike service manual contains only engine repairs.
Lifesaver!
Very helpful video. Thank you for sharing it.
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?
ANYBODY know what the correct height for a 2004 Polaris predator 500 cause I swear its impossible to find online
The float height for your model should be 13-14mm (0.51-0.55")
Having trouble finding the correct float height for my 96 yz125 can anyone help me out?
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?
If the float height is off will that make it spill gas Into the breather box
I think so. That happened to me
@@AlloyedFrequencies could also be ya have your lines hooked up wrong too which is what happened to me
@@jongearhart1359 Thanks, I'll check
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?
yep. set float to shut off sooner
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
Have you looked at your jets inside the carb? Sometimes those can get partially clogged and exhibit some of the symptoms you're experiencing.
very usefull!!! thnx man!!!
Could this cause gas to leak into your oil I’m having that problem and can’t figure it out for the life of me
It could, but it is more likely that your needle and seat are damaged and leaking and instead of going through the overflow the gas might be going into the cylinders and draining through the rings into the crankcase.
What if i have a plastic tang on my float instead of a metal on?
If your float is completely plastic it cannot be adjusted and a new float would be needed.
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 ..
Can float level lead to plug fouling?
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
Does Rmc sell owner manuals , for 97 yz? Or can anyone point me in the right direction.
Ebay
What's the name of that tool you used at 7mm to verify float height?
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.
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
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.
Thanks
Why does my carb leak
My god, dude, heighth is not a word
Heighth? Flow heighth?
Speakth englith??!?!
@@lk6912 someone didn't get the joke 🤌
That drove me nuts lol
Float heighth? Kinda like thread depth right?
My float stays down an won't come up
Hmm, is it brass? Could have a hole and be full of gas. Or do you mean it's frozen in that position? -Charles
Are you saying float height-th? How do you spell that? HA! Thanks for the informative video.
good info...just a nit-pick...it's not pronounced "higth" but "hite"... with a hard "t" at the end.
Thanks for checking out the video and leaving a comment!
👍🏻👍🏻👍🏻👍🏻
6
👍👍
height not heigth
7
Heighth
😂😂
He skipped the most important bit putting the floaty back in
Check out our new How-To Rebuild a Keihin Carb video where we show how to put in a float @ 25:41 ua-cam.com/video/Hkn0tHP1vSg/v-deo.html
5t
I can't take it. "Heighth" please make it stop.
"heighth" "heighth" "heighth" OK THAT'S IT! I CAN'T TAKE IT! I'M OUT
Height not heighth can’t watch your video if you can’t pronounce a simple word you learn in 1st grade
Great Video well explained.
Thanks