Dude you need a medal for how consise and accurate your information is here! Perfectly broken down so that even laymen could grasp the workings well done sir
Hello My name is Jani Soini and I'm from Finland and I removed the restriction from my exhaust pipe. Now I have to change the main jet to a bigger one but don't know what sice... My friend's say that if I don't change it to a bigger one the motor might be ruined. Can you please please help me!?? 😯 I have a sym Jet euro x 50cc scooter. Can you tell me what size pilot jet is good for my bike ? I would be forever grateful if??
Thank YOU!!!!...not TOO technical; straight forward. I've owned 70's thru 90's motorcycles(n cars) but these tiny carbs are SO sensitive--the lazy part of me wanted to just buy a NEW carb online without manual choke...but THIS video gave confidence that all these giant BOOK manuals have given me (tiny print; way too general, etc..)
Man, this is the best video I’ve seen on how to set the idle speed, you have saved my life. I’ve been trying for weeks to find someone to teach me and no one really knows how to properly do what you have just explained, not even the so-called experts. Thanks to your video now I know how to do it, I can’t wait to go tomorrow and set my DD2 rotax carburetor and FINALLY be able to drive like it’s supposed to. One again, THANK YOU SO MUCH 🙏👍👍👍
YES WHAT IF YOU CAN NOT GET IT STARTED TO DO WHAT YOU ARE SHOWING ME TO DO WHEN MINE HAS MABEY 2 HUNDRED MILES. A it just stopped. I had to put the bike in the truck to get it home. took the carberatour apart , put it back togather, started and ran . 15 min. later turned it off , never would start again. Have great spark!
What if turning the air screw all the way in or all the way out makes no difference at all? I bought a new carburetor which is sold for my bike model and it is supposed to work out of the box. And indeed it works, idle, half throttle and full throttle. But I cant set the air screw cause it looks like it does nothing.
@@49ccscoot using it today I found out that it works pretty rich. Because when I turn it on and rev it, lot of smoke is coming out of the exhaust. Also I have to give it throttle in order to turn on. It does not turn on by pushing only the starter button. The carb is a brand new 17mm chinese gurtner clone. Replaced a dellorto phva 12.
@@cabrinhaGR So much for "supposed to work out of the box". Possibly too large of a main jet and pilot jet.I'd prob start with main jet swaps to see if that helps it all around.
@@49ccscoot main jet comes into play when throttle is fully open, right? And when I am on wot everything is ok. In fact everything looks ok in the whole spectrum, from idle to wot. The only problem is that the air screw does not affect mixture (no rise or fall of rpm, no engine stall etc.).
@@cabrinhaGR It does. Large main jet could make everything bad, but if it's good everywhere else then prob don't start there. New or not, I'd clean the carb. I don't trust Chinese stuff to be setup properly or free of debris.
This has made a lot of sense because soon as the vacuum pipe is on it doesn’t start use a vacuum pump tester it works I’m guessing ether the carb or vacuum tap isn’t working properly
I need a float for this exact carburetor, mine is off a Bombardier DS90 2stroke but they discontinued the parts. Where can I find aftermarket parts??? Or can you give me a part number for this?
Take a look at PartsForScooters part number 161-214. There used to be some rebuild kits around if you searched for something like "polaris 90 carburetor rebuild". You can look in a Polaris parts manual for an outlaw/sportsman/predator 50-90 and see if they have a part you can get.
90GTVert you nailed it with the Polaris 90 recommendation! Found a part number through the Polaris Predator 90 diagram! www.partzilla.com/catalog/polaris/atv/2004/predator-90-a04ka09ca/carburetor-cb Thanks again, very helpful!
great video and breakdown. my kids little atv was idling rough, thumping...and backfiring every so often. Adjusted the idle and richened it up a little bit, idling like new, smooth, and no backfires. Thank you!
Can someone tell me what the upper left copper nipple is and what it does. I’ve got this hyosung sd50 rush challenger 2002 that had a cable shoe fitted with a white/red cable connected to it between that. And onto where it looks like a vacuum hose would be put there was another cable shoe mounted straight onto the nipple with a yellow/white cable connected.. need to know what this is since i havent seen this before. It will sometimes start and sometimes wont start. Will idle for 10 secs and then die out. Havent seen this on ang other carb.. New to these korean 50cc’s
i have a 18 mm keihin cvk carb for 4t.stock filter.mainjet is like 78.now this carb has a different basic setup like air screw 2.5 turn out.i did replace my mainjet for 80 but now i only get a stable idle when i turn the air screw like 3 or 3.25 out.pilojet is 35 but i dont think need a smaller one normaly never need to touch the pilotjet.so im wondering how im suppose to set it up to give less air.i dont have airleak i check it many times.but strange things happens the idle screw not really responding.but the throttle cable sit proper so i have no idea why need the carb more air.
Or just buy an inductive RPM guage that you can clip onto the sparkplug lead and you don't need to listen to idle speeds but you can just litteraly read them on the guage, and since this type of guage is for temporary usage you don't need to do anything to your scooter / ATV. Most of these guages go for around 20 bucks, so it's not expensive and makes live a whole lot easier. I know it did for me when adjusting the idle speed on the scooter.
My dumbass thought turning counter clockwise opened up something to allow more fuel in or richen then mixture. But now I see clockwise richens the mixture. Lol. Hopefully this resolves my issue and I can get back on the road tomorrow.
9OGTVert By far the most informative video i found on the mixture screw adjustment; And, as i suspected, my pilot jet is TOO SMALL,or partially plugged(air screw ALL the way in). Thanks a lot.
Mfgs closed these off to pass pollution control regs. The factory setting is supposed to be the optimal and theoretically you should never have to change it. Just another case of big brother knowing best.
See what's connected to your airbox that could allow those things in first. For oil to get in there with most 2 strokes, it would have to run in from the injection system. If it were just oil spitting back into the airbox, it shouldn't be much even with bad reeds or something. Water really shouldn't be in there unless there's some way for it to happen with a wash or rain.
Hope I get reply so once I go over 2& half turn I get the best idile any more there’s no change so do I stopwhere the best idile is.... Are trying to say that you should be able to screw out for the best idile and before the screw pops out you should get a drop in revs as well ?????
My revs at idile on mixer screw is two and half turns out the revs increase at at 1/half between one and half and two and half these no difference so where do I leave it
Hi. I've got a 55 plate gilera runner sp50 and it runs fine on idle and low speeds. But it bogs down on full throttle. Any ideas? I know it's running too rich from the spark plug but not sure how to sort it. Thanks
+Cody Sparrow When the problem is at full throttle, you should be looking at the main jet. It's either the wrong size for your application or it's clogged. There's a chance that float height is off and making it rich, but usually the low throttle operation is affected more.
Hi, thanks for getting back to me. I've noticed that when the engine is running cold its not affected but gets worse the warmer the engine runs. Could that be caused by the same thing? Thanks
I've got an old PW50 and it idles perfect when cool but once it's warmed up it idles high enough to move the bike. You figure adjusting these screws will take care of that issue?
Would u mind explaining the rolling wrench pwk 21mm carb that's said to be for the bbk qmb39. Has a blue an red knob . Blue on left side an red on right side an both are on the air filter end of carb
No exp. Just looked at pics. Blue is idle speed. Guessing the knob will be choke. Idle mix screw should control air on the PWK. Looks like a $25 AliExpress carb to me, with extra decals.
What about the airflow ? How to adjust that. I messed with these and now my vivacity goes perfectly up to 10km/h but when I give gas it goes barely up to 25-30, more gas and it dies. Used to do 60 not even full gas on. Pls help
i bought a couple of 49CC 2 stroke scooters, and mostly drive them up at 6K in elevation. so if im hearing this video correctly, i should be screwing the idle bolt in, to increase the air flow?
You'd probably want more air to lean it out a bit. If the idle mix screw is on the air filter side, then it's controlling air. Screwing it out allows more air in. If it's on the engine side, it controls fuel. Screwing it in reduces fuel.
I have a 2 stroke bike 125cc. I bought an aftermarket exhaust for this model and for the same cc. I changed it and i did some settings on my mixture screw. I have now a good and continuously idle at one and a half (1,5) - quarter past 2 turns out and the bike it seems that its working very good. BUT when i'm putting the 1st gear and trying to run the bike bog. What is your opinion about that? Its the exhaust the problem ? Or something else? Thanks in advance
Are you sure you don't need to be more aggressive with the clutch? Tuned pipes for 2Ts typically make more power at higher revs at the expense of robbing output at lower revs. I'm mostly accustomed to CVT transmissions, but we have to use higher engagement clutch springs and lighter weights to keep RPM up with tuned pipes. You may also have needle or main jet issues.
Thks four your video I have a Peugeot V-Clic 50cc 4T when I started the scooter the item going up for few seconds and caming down after 5 seconds is up again constantly up and down can you please help me thank you very much apreciate
dose having the lowest mixture adjustment and a good idle adjustment effects the engine? btw my scooter runs smooth with this adjustment it doesn't stop i have a 2t 49cc bw's booster 5 2003
Do you know what set of jets this carb would take? I have a 50cc Rivera Jog and the carb looks exactly like this one. Thanks in advance! This was an awesome video!
They're Mikuni VM11/22 jets or I've used Dellorto 6mm jets in them before. Whatever you use, get a set of all one brand and type. Don't mix and match or sometimes the sizes aren't accurate to each other. Name brand preferred... Mikunu, Polini, Stage6, and so on.
i have a v100 scooter 2stroke. i have cold starting.. hard to start. wont idle.. but it running fine when its already warm up.. what can cause that problem? is that because of auto choke not working properly?
What about for a scooter that starts and revs runs then revs up real high then dies? I've cleaned the carb and the jets and then fuel pet cock as well and still just reving high then dies. Could it be a vacuum issue or air flow? It is on a 1989 yamaha razz 50c scooter. Anything advice would help. Thanks
I need help please. I have a kymco cobra 50 2 stroke scooter. I know when you cold start 2 strokes they rev high and go back down but this is not the case! I’ve cleaned the carb many times and nothing. I acecelerate to take off it revs high and won’t go back down. Clutch is good
Hi there I have a 50cc Honda x8r 2002 moped and in the mornings it struggles to start massively thing is I’m not a motorbike mechanic I don’t know it’s carb settings or anything like that wandering if you knew of them if you worked on one before
I don't know anything about that specific bike. If it has an automatic electric enricher/choke, you may want to check that out. Good news is that being a Honda you should be able to find a service manual that will tell you how to do that and also lots of other troubleshooting. You can try a sort of "crutch" that sometimes helps till the issue is found. I have had iridium spark plugs help hard starting bikes before. It is not a fix. Just something that may (or may not) make it work slightly better quickly.
Got it screwed all the way in.to idle properly on the mixture screw.....you think pilot jet still partially plugged? Will idle nice when warm..was sitting for years .. maybe I didn't clean pilot jet enough..a little difficult to start cold..
Where to go with jetting if my spark plug is oily? Bigger main jet? My exhaust also get filled with oil after some hundred miles and have to get burned out because of performance drop.
If you're premixing you could be using too much oil or possibly too rich on the tune. If you're using the stock injection system I would advise inspecting it first. See if you've got oil collecting anywhere else like the airbox or intake. See if oil leaks even when the engine is off.
Wow I Am A Robot. turn screw open screw I am a robot.when I screw I sound like a robot...Lol .Is it in honey I am a robot no it's in the mud I am a robot .Put it back in no I will keep it in the mud.I am A Robot .I am a rrrrrrobbtt squirttttt.I lost my hard drive in her main frame .I am a robot
If the carb has been apart, the first thing I'd do is check the throttle cable and slide. It's pretty common for someone to put the slide (throttle valve) in wrong and then the engine revs as soon as it's started. If it's less aggressive than that, it may just be something like the idle speed adjusted too high or not enough slack on the throttle cable.
Make sure the airbox and air filter are in good condition first and that all connections are correct. Make sure the fuel supply is good. Nothing appears to be loose, like intake bolts or exhaust or the fitting of the carb into the intake or airbox. Could just be out of tune beyond that. Some of the 49cc carbs come with really small jets.
My Carburetor seems to be leaking at the idle mixture valve. Can this be fixed or does the entire carburetor need to be replace? I have taken apart and cleaned the carburetor and it is still leaking. Any help would be appreciated.
My bike is not sucking fuel, it seems like there isn’t enough suction to make the fuel come out. The jets are completely clear along with all the passage ways. I’m stumped any help?
Are you sure it's getting fuel to the carb? Could be the petcock or something clogged. If you don't feel much suction when you cover the mouth of the carb with your palm and the engine is turned over, you may have low compression or something not sealing so do a compression and/or leak test.
If it has been sitting for a while before this, first clean the carb thoroughly. Popping is usually lean. Aside from carb cleaning and tuning, check fuel supply.
THANK YYYYYOOOOOUUUUU!!!!!!!!!!!!!!!!!! I been looking alllll day to c what this 2 screws do to my mini bike jeez. Finally to the point. Great no no no awesome vid bro thanks for the info I DEEPLY APPRECIATE IT P.S. I gave u a 👍🏻 u more than deserve it
Check little stuff first. Kill switch set to run, still has fuel, alarm not on... Sounds silly, but it's surprisingly common for someone to use the kill switch and the next person that normally only uses the key can't start it. Checking for spark is quick and you can often feel if compression is low by working the kick starter. Sometimes it's not the thing last touched. If he just messed with the idle settings, I'd start by setting the mix screw 1-2 turns out from seated and see if that's much of a change or allows it to start. If he did more, find out what he changed.
Muito obrigado pela super dica,eu tenho uma yamaha Jog 50cc e demorei muito pra encontrar o ponto certo da regulagem do Ar e da marcha lenta,agora deu certo 😘👍🏼👌🏼 Tank You Man 😎👍🏼
Is there ONE VIDEO ON ALL OF UA-cam WHERE THEY TAKE A 50cc 2 Stroke Carb and start from attaching it to manifold and showing each tube and where they go?
i dont know why my scooter stops accelerating and basically stops when i use full throttle and when i put my throttle back up then it starts accelerating again? i need help😩
I have a 2006 Polaris sportsman 90 and it idles just find but starting off from a dead stop it acts like it wants to die and sometimes it does die. Any suggestions?
Could be carb related. Maybe a different needle setting. If it sputters try leaning the needle. If not you could try richening the needle setting. Could be a CVT problem. Maybe the clutch is engaging too early, roller weights are too heavy/contra spring too light, or the belt is being squeezed, or it could be dirty. Scooter CVT Transmission : Full Service Inspection
can you possibly explain to me WHY... in the name of ALL the gods that have EVER bin conjured up in mans history..... my tomos with 70cc airsal, 18mm intake, Dellorto PHVA ED 17.5mm Carburetor and High-Flow air filter is CONSTANTLY alternating from high idle RPM to low idle RPM no matter WHERE I PUT THIS DAMNED air-mixture screw? when i set the screw "lean" or counter-clockwise, she speeds up in idle RPM's, and when i go "rich" or clockwise, she goes down in RPM's. BUT.... ether setting, i still get a Rhythmic shifting of RPM's up and down like clockwork no matter what setting i try to dial in :( and i know what your going to think first.... you have an air leak :P but trust me... i have done a standard leak test on ALL engine components, as well as an actual leak-down test using a professional system at my local motorcycle repair shop and there is absolutely NO air leaks on this thing what so ever.... ANY ideas would REAL make my year on this bike.... i am so out of ideas :(
I lost the pilot screw when riding a Honda Spree years ago. Somehow it kept going and got me home. Same for when one of the carb bolts fell out and I had to zip tie the carb on to get me home.
So the idle speed adjustment adjusts idle speed. But also the air/fuel adjustment affects speed also Where do you start with the idle speed adjustment then?
It would depend on the characteristics of each carb exactly, but turning the idle speed screw in does the same thing that twisting the throttle open does.
Sounds like you've got a sealed carb. The carb is a little different, but the way the mix screw is capped is likely the same as this... ua-cam.com/video/MLpkf2LINzo/v-deo.html
adjusting carburetor is not all ...oil mixer have to be also a good and spark plug. one important thing that lots of people do not check a leaking PETCOCK . controll and checking spark plug to see if it is black or dirty with sloos oil if your cables on carburetor is not set right or too old. or compression is weak.
adrian marbibi Start by determining when it happens. Always at wide open throttle or always at idle or always at 1/2 throttle etc... or does it die at any throttle position? Note any details you can to help you narrow your search.
Okk so I have a gilera runner 50cc it has a k&n air filter and a pm tuning 360 pipe it has a 100 main jet and I was told I would need a 110 to 113 for the main jet because it bogs down when I full throttle is this the idle or the jet please help thanks?
Try the mix screw about 2 turns out. With the idle speed screw, you just don't want to screw it in too far and have the engine rev high if it starts so adjust it till you just start seeing it raise the throttle slide up a little to start and you can turn it in more as needed.
does anyone know what or where the infuser goes? i got a kit for my tomos carb dellorto PHVA and came with main jet, choke jet and infuser. any info would help, i put a pipe on it and it bogs badly when going, idles great, pipe sounds awesome.
So i took aff my carbureto to clean it and after i put it back the scooter won't start i don't know the reason and the carburetor it's correctly assembled back
To adjust my bike, do I have to adjust first the idle speed, and then the mixture screw?? Then if the engine goes to fast I will have to turn again the idle speed? and then the mixture again?? or when the mixture is done good it doesn't have to be touched again?? thank you so much
Thanks for your explanation.My bike Yamaha FZR 250. i cleaned my mikuni carburator (4) and cleaned main jet,pilot jet and adjust air mixture 2.5 turns out from the closing point.Cleaned the air filter.My problem is 3 times failed my eco (smoke) test and result show more petrol consumption.but last years easily pass the eco test.My problem is need to reduce petrol.How can i adjust/reduce petrol flow ?please help.Thanks.
Ran great! then no throttle respose other than a almost closed it slowing down any way. Never started again. When I took the carb apart its started and ran wiyh power. after 5 min I cut it off, never started again?!
It's difficult to adjust these to that "Sweet spot" when you can't get the engine starting to begin with
Dude you need a medal for how consise and accurate your information is here! Perfectly broken down so that even laymen could grasp the workings well done sir
I agree. I was having so many problems and getting excess information on other channels. This broke it down barney style!
Good job you came right to the point . Some guys talk to much about things that has nothing to do with the subject. Good job, very helpful.
Thank you.
Able Reyes jthe
Finaly a simple video that gets strait to the point and is broad enough to give a general but great understanding I thank u for this
Hello
My name is Jani Soini and I'm from Finland and I removed the restriction from my exhaust pipe. Now I have to change the main jet to a bigger one but don't know what sice... My friend's say that if I don't change it to a bigger one the motor might be ruined. Can you please please help me!?? 😯 I have a sym Jet euro x 50cc scooter. Can you tell me what size pilot jet is good for my bike ? I would be forever grateful if??
Bonjour mon j ai un petit prommble avec mon carburateur quand mes le pleins je fait une journée avec le scooter c est un imf
@@jamppa80 11111¹
🤣😂😭🤔😂facts
After 8 years,and right on time when i needed this,great work and thank you
Haha! Me too. I'm guessing it's 2-1/2 turns as mine was never adjusted properly..
Thank YOU!!!!...not TOO technical; straight forward. I've owned 70's thru 90's motorcycles(n cars) but these tiny carbs are SO sensitive--the lazy part of me wanted to just buy a NEW carb online without manual choke...but THIS video gave confidence that all these giant BOOK manuals have given me (tiny print; way too general, etc..)
Man, this is the best video I’ve seen on how to set the idle speed, you have saved my life. I’ve been trying for weeks to find someone to teach me and no one really knows how to properly do what you have just explained, not even the so-called experts. Thanks to your video now I know how to do it, I can’t wait to go tomorrow and set my DD2 rotax carburetor and FINALLY be able to drive like it’s supposed to. One again, THANK YOU SO MUCH 🙏👍👍👍
this is exaclty what i've been waiting for, this is EXACTLY I don't mean to sound like Katt Williams but this is exactly what I've been waiting for
This is the best fucking video I've ever seen
Finally someone with time to show how its done right 👏
Thanks so much man, this is what I needed to know. Not many carb videos cover both both screws.
Minus both
By far the best and easiest well said of this type of carburetor adjustment on UA-cam.
My scooter just lost 5mph and I have no idea why or what to do to get it back to where it use to be
Very helpful thank you!!
Where on this carburetor is the fuel inlate, at the front or at the top?
It's the big barb at the top. Watch near the end of this : ua-cam.com/video/UipC6DLD-EE/v-deo.htmlsi=PuMtbGcDENr_K4FJ
Finally a video for novices, thank you!!!!
The fuck now my 2 stroke motorcycle is faster
YES WHAT IF YOU CAN NOT GET IT STARTED TO DO WHAT YOU ARE SHOWING ME TO DO WHEN MINE HAS MABEY 2 HUNDRED MILES. A it just stopped. I had to put the bike in the truck to get it home. took the carberatour apart , put it back togather, started and ran . 15 min. later turned it off , never would start again. Have great spark!
What happened each time it died on you? ... Wide open throttle... cruising... came to a stop sign... made a noise... etc...
What if turning the air screw all the way in or all the way out makes no difference at all? I bought a new carburetor which is sold for my bike model and it is supposed to work out of the box. And indeed it works, idle, half throttle and full throttle. But I cant set the air screw cause it looks like it does nothing.
Maybe the float height is wrong or the pilot jet is way off.
@@49ccscoot using it today I found out that it works pretty rich. Because when I turn it on and rev it, lot of smoke is coming out of the exhaust. Also I have to give it throttle in order to turn on. It does not turn on by pushing only the starter button.
The carb is a brand new 17mm chinese gurtner clone. Replaced a dellorto phva 12.
@@cabrinhaGR So much for "supposed to work out of the box". Possibly too large of a main jet and pilot jet.I'd prob start with main jet swaps to see if that helps it all around.
@@49ccscoot main jet comes into play when throttle is fully open, right? And when I am on wot everything is ok. In fact everything looks ok in the whole spectrum, from idle to wot. The only problem is that the air screw does not affect mixture (no rise or fall of rpm, no engine stall etc.).
@@cabrinhaGR It does. Large main jet could make everything bad, but if it's good everywhere else then prob don't start there. New or not, I'd clean the carb. I don't trust Chinese stuff to be setup properly or free of debris.
This has made a lot of sense because soon as the vacuum pipe is on it doesn’t start use a vacuum pump tester it works I’m guessing ether the carb or vacuum tap isn’t working properly
I need a float for this exact carburetor, mine is off a Bombardier DS90 2stroke but they discontinued the parts.
Where can I find aftermarket parts???
Or can you give me a part number for this?
Take a look at PartsForScooters part number 161-214. There used to be some rebuild kits around if you searched for something like "polaris 90 carburetor rebuild". You can look in a Polaris parts manual for an outlaw/sportsman/predator 50-90 and see if they have a part you can get.
90GTVert you nailed it with the Polaris 90 recommendation!
Found a part number through the Polaris Predator 90 diagram!
www.partzilla.com/catalog/polaris/atv/2004/predator-90-a04ka09ca/carburetor-cb
Thanks again, very helpful!
Awesome. Glad to help!
Thanks for breaking this down barney style! Helps 100%
Thanks for the video, useful stuff
great video and breakdown. my kids little atv was idling rough, thumping...and backfiring every so often. Adjusted the idle and richened it up a little bit, idling like new, smooth, and no backfires. Thank you!
نريد منك ان تترجم اللغه من الانكليزيه الئ العربيه اثناء كلامك تترجم علئ الشاشه لو سمحت حتئ نفهم ونتعلم منك لطفا🌹🌹🌹
Great video. Simplifying the dark art of understanding a carb. Much thanks.
Can someone tell me what the upper left copper nipple is and what it does. I’ve got this hyosung sd50 rush challenger 2002 that had a cable shoe fitted with a white/red cable connected to it between that. And onto where it looks like a vacuum hose would be put there was another cable shoe mounted straight onto the nipple with a yellow/white cable connected.. need to know what this is since i havent seen this before. It will sometimes start and sometimes wont start. Will idle for 10 secs and then die out. Havent seen this on ang other carb.. New to these korean 50cc’s
i have a 18 mm keihin cvk carb for 4t.stock filter.mainjet is like 78.now this carb has a different basic setup like air screw 2.5 turn out.i did replace my mainjet for 80 but now i only get a stable idle when i turn the air screw like 3 or 3.25 out.pilojet is 35 but i dont think need a smaller one normaly never need to touch the pilotjet.so im wondering how im suppose to set it up to give less air.i dont have airleak i check it many times.but strange things happens the idle screw not really responding.but the throttle cable sit proper so i have no idea why need the carb more air.
Thank you for this simple video without any bullshit, nicely straight to the point
Or just buy an inductive RPM guage that you can clip onto the sparkplug lead and you don't need to listen to idle speeds but you can just litteraly read them on the guage, and since this type of guage is for temporary usage you don't need to do anything to your scooter / ATV.
Most of these guages go for around 20 bucks, so it's not expensive and makes live a whole lot easier. I know it did for me when adjusting the idle speed on the scooter.
My dumbass thought turning counter clockwise opened up something to allow more fuel in or richen then mixture. But now I see clockwise richens the mixture. Lol. Hopefully this resolves my issue and I can get back on the road tomorrow.
ممكن ترجمة للغة العربية
انا معي سيارة تعمل على كربريتر
وتصرف بنزين جدا اريد معرفة ضبط الهواء وبنزين بشكل جيد وشكرا لكم
My mixture screw is only 1 turn out. My scooter runs wonderfully 😊
I don't know if you will reply, but when I start my bike cold it trottles to almost max rpm and calms down when it warms up, what should I do?
Try adjusting the idle mix and speed. If that doesn't get you anywhere, see if the automatic enricher (if equipped) is working.
9OGTVert
By far the most informative video i found on the mixture screw adjustment;
And, as i suspected, my pilot jet is TOO SMALL,or partially plugged(air screw ALL the way in).
Thanks a lot.
Mfgs closed these off to pass pollution control regs. The factory setting is supposed to be the optimal and theoretically you should never have to change it. Just another case of big brother knowing best.
Why air filter inside oil n water sir.
See what's connected to your airbox that could allow those things in first. For oil to get in there with most 2 strokes, it would have to run in from the injection system. If it were just oil spitting back into the airbox, it shouldn't be much even with bad reeds or something. Water really shouldn't be in there unless there's some way for it to happen with a wash or rain.
Bom dia sou mineiro de lajinha. Mas resido em balneário de iriri. Mestre .como regular a bóia de carburador .que está em suas mãos.
thanks man. Found it Really help ful.
guys if my starter is working but the motorbike is not starting where should i screw?
My moped idle wasn't right it wouldn't stay idled I did this problem solved
Nice
Hope I get reply so once I go over 2& half turn I get the best idile any more there’s no change so do I stopwhere the best idile is....
Are trying to say that you should be able to screw out for the best idile and before the screw pops out you should get a drop in revs as well ?????
I would try a larger or smaller pilot to see what happens. Depending if you have an air or fuel screw.
My revs at idile on mixer screw is two and half turns out the revs increase at at 1/half between one and half and two and half these no difference so where do I leave it
Yes!! Finally... A simple explanation. Thanks!
I know some older Yamahas didn't have mix screws, but I don't know the reason.
Hi. I've got a 55 plate gilera runner sp50 and it runs fine on idle and low speeds. But it bogs down on full throttle. Any ideas? I know it's running too rich from the spark plug but not sure how to sort it. Thanks
+Cody Sparrow When the problem is at full throttle, you should be looking at the main jet. It's either the wrong size for your application or it's clogged. There's a chance that float height is off and making it rich, but usually the low throttle operation is affected more.
Hi, thanks for getting back to me. I've noticed that when the engine is running cold its not affected but gets worse the warmer the engine runs. Could that be caused by the same thing? Thanks
The engine needs more fuel when cold, so as it warms up a rich condition may show worse symptoms.
How can I make my throttle response quick on my 2007 yz85.
There's no short easy answer. Gotta spend some time tuning it.
www.49ccscoot.com/faq/carbtune.html
V force reed
I've got an old PW50 and it idles perfect when cool but once it's warmed up it idles high enough to move the bike. You figure adjusting these screws will take care of that issue?
@@hulldefilade4897 Adjust when warm and it may.
i went to subscribe but the i realised i was already subscribed XD i must have done it a while ago XD
Would u mind explaining the rolling wrench pwk 21mm carb that's said to be for the bbk qmb39. Has a blue an red knob . Blue on left side an red on right side an both are on the air filter end of carb
No exp. Just looked at pics. Blue is idle speed. Guessing the knob will be choke. Idle mix screw should control air on the PWK. Looks like a $25 AliExpress carb to me, with extra decals.
What about the airflow ? How to adjust that. I messed with these and now my vivacity goes perfectly up to 10km/h but when I give gas it goes barely up to 25-30, more gas and it dies. Used to do 60 not even full gas on. Pls help
Make sure your jets are not clogged and the carb is clean first... as well as air filter in good condition, no leaks and no other mechanical issues.
why the fuck can i not tell a diffidence in rpm when i turn the mixture screw?
i bought a couple of 49CC 2 stroke scooters, and mostly drive them up at 6K in elevation. so if im hearing this video correctly, i should be screwing the idle bolt in, to increase the air flow?
You'd probably want more air to lean it out a bit. If the idle mix screw is on the air filter side, then it's controlling air. Screwing it out allows more air in. If it's on the engine side, it controls fuel. Screwing it in reduces fuel.
Thanks for the video... It was very helpful...keep it coming...
I have a 2 stroke bike 125cc. I bought an aftermarket exhaust for this model and for the same cc. I changed it and i did some settings on my mixture screw. I have now a good and continuously idle at one and a half (1,5) - quarter past 2 turns out and the bike it seems that its working very good. BUT when i'm putting the 1st gear and trying to run the bike bog. What is your opinion about that?
Its the exhaust the problem ? Or something else?
Thanks in advance
Are you sure you don't need to be more aggressive with the clutch? Tuned pipes for 2Ts typically make more power at higher revs at the expense of robbing output at lower revs. I'm mostly accustomed to CVT transmissions, but we have to use higher engagement clutch springs and lighter weights to keep RPM up with tuned pipes.
You may also have needle or main jet issues.
Thks four your video I have a Peugeot V-Clic 50cc 4T when I started the scooter the item going up for few seconds and caming down after 5 seconds is up again constantly up and down can you please help me thank you very much apreciate
Check for intake leaks first. Loose connections, cracked intake, bad gaskets...
bolton a 150cc and hit 65mph
dose having the lowest mixture adjustment and a good idle adjustment effects the engine?
btw my scooter runs smooth with this adjustment it doesn't stop i have a 2t 49cc bw's booster 5 2003
Keeping it in tune at idle can help it run well at low throttle as well.
I am watching this for a toro lawn mower i turn thing now I am scrwed
Do you know what set of jets this carb would take? I have a 50cc Rivera Jog and the carb looks exactly like this one. Thanks in advance! This was an awesome video!
They're Mikuni VM11/22 jets or I've used Dellorto 6mm jets in them before. Whatever you use, get a set of all one brand and type. Don't mix and match or sometimes the sizes aren't accurate to each other. Name brand preferred... Mikunu, Polini, Stage6, and so on.
i have a v100 scooter 2stroke. i have cold starting.. hard to start. wont idle.. but it running fine when its already warm up.. what can cause that problem? is that because of auto choke not working properly?
Could be the auto choke. Maybe as simple as a spark plug in need of replacement. Sometimes if the carb tune is off that can happen.
What about for a scooter that starts and revs runs then revs up real high then dies? I've cleaned the carb and the jets and then fuel pet cock as well and still just reving high then dies. Could it be a vacuum issue or air flow? It is on a 1989 yamaha razz 50c scooter. Anything advice would help. Thanks
Check for vacuum/case leaks. Best way is a pressure tester.
49ccscoot.proboards.com/thread/506/make-2t-leak-tester-ways
I need help please. I have a kymco cobra 50 2 stroke scooter. I know when you cold start 2 strokes they rev high and go back down but this is not the case! I’ve cleaned the carb many times and nothing. I acecelerate to take off it revs high and won’t go back down. Clutch is good
Have you checked it for intake/case leaks? Sure the throttle setup is working as it should?
Hi there I have a 50cc Honda x8r 2002 moped and in the mornings it struggles to start massively thing is I’m not a motorbike mechanic I don’t know it’s carb settings or anything like that wandering if you knew of them if you worked on one before
I don't know anything about that specific bike. If it has an automatic electric enricher/choke, you may want to check that out. Good news is that being a Honda you should be able to find a service manual that will tell you how to do that and also lots of other troubleshooting. You can try a sort of "crutch" that sometimes helps till the issue is found. I have had iridium spark plugs help hard starting bikes before. It is not a fix. Just something that may (or may not) make it work slightly better quickly.
Got it screwed all the way in.to idle properly on the mixture screw.....you think pilot jet still partially plugged? Will idle nice when warm..was sitting for years .. maybe I didn't clean pilot jet enough..a little difficult to start cold..
Could be. If you happen to have access to an ultrasonic cleaner, that's a good step for a stubborn carb too.
Where to go with jetting if my spark plug is oily? Bigger main jet? My exhaust also get filled with oil after some hundred miles and have to get burned out because of performance drop.
If you're premixing you could be using too much oil or possibly too rich on the tune. If you're using the stock injection system I would advise inspecting it first. See if you've got oil collecting anywhere else like the airbox or intake. See if oil leaks even when the engine is off.
Wow I Am A Robot. turn screw open screw I am a robot.when I screw I sound like a robot...Lol .Is it in honey I am a robot no it's in the mud I am a robot .Put it back in no I will keep it in the mud.I am A Robot .I am a rrrrrrobbtt squirttttt.I lost my hard drive in her main frame .I am a robot
Beep boop. I was just checking your videos to see which ones had over 2 million views and helped a bunch of people, but I couldn't find them. 😛
My gas scooter accelerates without giving it gas... What could be the problem.. plz help
If the carb has been apart, the first thing I'd do is check the throttle cable and slide. It's pretty common for someone to put the slide (throttle valve) in wrong and then the engine revs as soon as it's started. If it's less aggressive than that, it may just be something like the idle speed adjusted too high or not enough slack on the throttle cable.
I bought brand new 49 cc that runs only on choke. I cleaned the carburetor but nothing changed. Do you have any suggestion to fix this issue?
Make sure the airbox and air filter are in good condition first and that all connections are correct. Make sure the fuel supply is good. Nothing appears to be loose, like intake bolts or exhaust or the fitting of the carb into the intake or airbox. Could just be out of tune beyond that. Some of the 49cc carbs come with really small jets.
My Carburetor seems to be leaking at the idle mixture valve. Can this be fixed or does the entire carburetor need to be replace? I have taken apart and cleaned the carburetor and it is still leaking. Any help would be appreciated.
Jared Zieris There's usually an o-ring or other type of seal back there. Maybe it's gone or in bad shape.
My bike is not sucking fuel, it seems like there isn’t enough suction to make the fuel come out. The jets are completely clear along with all the passage ways. I’m stumped any help?
Are you sure it's getting fuel to the carb? Could be the petcock or something clogged. If you don't feel much suction when you cover the mouth of the carb with your palm and the engine is turned over, you may have low compression or something not sealing so do a compression and/or leak test.
Very Good Video helped out alot thanks
Trying to figure out why calibrator popping and not idling properly do I need to ajustcarborator it's a honda yrs 400 ec 2005 atv
If it has been sitting for a while before this, first clean the carb thoroughly. Popping is usually lean. Aside from carb cleaning and tuning, check fuel supply.
THANK YYYYYOOOOOUUUUU!!!!!!!!!!!!!!!!!!
I been looking alllll day to c what this 2 screws do to my mini bike jeez. Finally to the point. Great no no no awesome vid bro thanks for the info I DEEPLY APPRECIATE IT
P.S. I gave u a 👍🏻 u more than deserve it
Hi great video but can you help me with my problem my friend adjusted my carb then the bike wont turn on anymore. What should i do??
Check little stuff first. Kill switch set to run, still has fuel, alarm not on... Sounds silly, but it's surprisingly common for someone to use the kill switch and the next person that normally only uses the key can't start it.
Checking for spark is quick and you can often feel if compression is low by working the kick starter. Sometimes it's not the thing last touched.
If he just messed with the idle settings, I'd start by setting the mix screw 1-2 turns out from seated and see if that's much of a change or allows it to start. If he did more, find out what he changed.
i opened the carborator from top screws and put in carb cleaner directly... i was wrong ??
That's not going to clean much. You need to disassemble the carburetor to really clean it.
Muito obrigado pela super dica,eu tenho uma yamaha Jog 50cc e demorei muito pra encontrar o ponto certo da regulagem do Ar e da marcha lenta,agora deu certo 😘👍🏼👌🏼 Tank You Man 😎👍🏼
Is there ONE VIDEO ON ALL OF UA-cam WHERE THEY TAKE A 50cc 2 Stroke Carb and start from attaching it to manifold and showing each tube and where they go?
i dont know why my scooter stops accelerating and basically stops when i use full throttle and when i put my throttle back up then it starts accelerating again? i need help😩
Start wit cleaning and checking it. Maybe the main jet is clogged.
I have a 2006 Polaris sportsman 90 and it idles just find but starting off from a dead stop it acts like it wants to die and sometimes it does die. Any suggestions?
Could be carb related. Maybe a different needle setting. If it sputters try leaning the needle. If not you could try richening the needle setting. Could be a CVT problem. Maybe the clutch is engaging too early, roller weights are too heavy/contra spring too light, or the belt is being squeezed, or it could be dirty.
Scooter CVT Transmission : Full Service Inspection
can you possibly explain to me WHY... in the name of ALL the gods that have EVER bin conjured up in mans history..... my tomos with 70cc airsal, 18mm intake, Dellorto PHVA ED 17.5mm Carburetor and High-Flow air filter is CONSTANTLY alternating from high idle RPM to low idle RPM no matter WHERE I PUT THIS DAMNED air-mixture screw? when i set the screw "lean" or counter-clockwise, she speeds up in idle RPM's, and when i go "rich" or clockwise, she goes down in RPM's. BUT.... ether setting, i still get a Rhythmic shifting of RPM's up and down like clockwork no matter what setting i try to dial in :( and i know what your going to think first.... you have an air leak :P but trust me... i have done a standard leak test on ALL engine components, as well as an actual leak-down test using a professional system at my local motorcycle repair shop and there is absolutely NO air leaks on this thing what so ever.... ANY ideas would REAL make my year on this bike.... i am so out of ideas :(
So I have a moped 50cc that will run for 10secs. It won't run enough to get it warm.. in order to adjust it.
Make sure the fuel supply is good first and that the float height is set correctly.
This helped me a lot with my honda City express from 1989. Thanks :)
I lost the pilot screw when riding a Honda Spree years ago. Somehow it kept going and got me home. Same for when one of the carb bolts fell out and I had to zip tie the carb on to get me home.
So the idle speed adjustment adjusts idle speed.
But also the air/fuel adjustment affects speed also
Where do you start with the idle speed adjustment then?
Start with the speed screw. Then adjust mix. If idle raises too much, correct with the speed screw.
What's is pillot jet on carburetor
Hey cool video ! So at idle if you turn the idle speed screw there will be fuel sucked out of the main jet ? Because you raised the needle?
It would depend on the characteristics of each carb exactly, but turning the idle speed screw in does the same thing that twisting the throttle open does.
These tips should help me with a OKO 21 mm. carb. larger the numbers on a pilot jet correct?
The main jet should be the larger number. Not sure if that's what you were asking. If not, please clarify.
what if the bike doesnt have the idle air mix screw ? i cant find one.. can see the place it could be but its blocked off with metal?? help
Sounds like you've got a sealed carb. The carb is a little different, but the way the mix screw is capped is likely the same as this...
ua-cam.com/video/MLpkf2LINzo/v-deo.html
adjusting carburetor is not all ...oil mixer have to be also a good and spark plug. one important thing that lots of people do not check a leaking PETCOCK . controll and checking spark plug to see if it is black or dirty with sloos oil if your cables on carburetor is not set right or too old. or compression is weak.
my carborator for two stroke always die... i already clean and check the fuel lines it but still it dies what am i suppose to do with it...?
adrian marbibi Start by determining when it happens. Always at wide open throttle or always at idle or always at 1/2 throttle etc... or does it die at any throttle position? Note any details you can to help you narrow your search.
Okk so I have a gilera runner 50cc it has a k&n air filter and a pm tuning 360 pipe it has a 100 main jet and I was told I would need a 110 to 113 for the main jet because it bogs down when I full throttle is this the idle or the jet please help thanks?
thank u very much sir for free knowledge
Glad to help!
Can you give me each screws setting to start off with? It’s all out of wack I need a base line and then I can fine tune thanks
Try the mix screw about 2 turns out. With the idle speed screw, you just don't want to screw it in too far and have the engine rev high if it starts so adjust it till you just start seeing it raise the throttle slide up a little to start and you can turn it in more as needed.
does anyone know what or where the infuser goes? i got a kit for my tomos carb dellorto PHVA and came with main jet, choke jet and infuser.
any info would help, i put a pipe on it and it bogs badly when going, idles great, pipe sounds awesome.
So i took aff my carbureto to clean it and after i put it back the scooter won't start i don't know the reason and the carburetor it's correctly assembled back
Check that the carb is getting fuel. It may take a little cranking to prime.
To adjust my bike, do I have to adjust first the idle speed, and then the mixture screw??
Then if the engine goes to fast I will have to turn again the idle speed? and then the mixture again?? or when the mixture is done good it doesn't have to be touched again?? thank you so much
It would only make it quieter at idle since it's revving less. Should not change it otherwise. Check your exhaust connections and silencer packing.
Thanks for your explanation.My bike Yamaha FZR 250. i cleaned my mikuni
carburator (4) and cleaned main jet,pilot jet and adjust air mixture 2.5
turns out from the closing point.Cleaned the air filter.My problem is 3 times failed my eco
(smoke) test and result show more petrol consumption.but last years
easily pass the eco test.My problem is need to reduce petrol.How can i
adjust/reduce petrol flow ?please help.Thanks.
Try cleaning the carb first. Could be a dirty or clogged jet or passage making it need to be choked to run.
Ran great! then no throttle respose other than a almost closed it slowing down any way. Never started again. When I took the carb apart its started and ran wiyh power. after 5 min I cut it off, never started again?!