How to tune a carburetor in a GY6 chinese scooter 150 or 50 cc

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Tuning a GY6 carburetor in a chinese scooter. This procedure works with most chinese scooters, 50cc, 125cc, and 150cc.

[@ferchazTV]

9 years later I found this video in 2023 and it’s the best explanation I have ever seen , thank you !

[@jngarr]

After researching and watching a dozen or more carb adjustment videos on youtube, I found yours. This is BY FAR the most thorough, well explained and factual video on carb workings and the "whys and wherefores" that is on youtube! Congrats and thanks! Make more please.

[@TheBiscuitFactory]

Seriously the best carb video. I’ve had so many unanswered questions with other videos but you seriously nailed every one of them.. when you decided to tell us how to tell if you’re running lean or rich or if you have the right jets I was soooo happy. I just ordered a gy6 for my ruckus for a swap and this was so helpful. Thanks again.

[@stanlee9575]

9 years ago you did a great job of explaining how a carb works.

[@davefman1984]

This is one of the most in depth tutorials I have come across on the explanation of how the different parts of the carburetor work together. I worked as an auto mechanic for 5 years so I'm very familiar with carburetors. I appreciate that he didn't " dumb down" the terminology

[@22bernd1957]

Thank you Paul Clearly one of the better videos on carb tuning. You describe and show it clearly, I learned it here! Thanks

[@IrishBeast88]

As far as KZbin tutorials go, this is one of the most helpful and practical ones I've seen. Clear instructions and explanations. Now I have a much better idea of how to take care of my little Wolf RX-50. I end up riding about 500-700 miles a week due to my work, and I can already tell (at 1500 miles) that my current carb will need to be cleaned and adjusted often. I have been wondering if I can install a higher quality carb as well, since I'll be replacing the ignition, intake, and exhaust in the next few weeks.

[@howardroberts1655]

Outstanding explanation, your the professor of gy6 carbs, thank you!!!!!!!

[@Spitfireseven]

The most excellent video imaginable. I knew about a lot of it but what you did with the shims and how you explained the actual fuel flow was simply the most excellent explanation imaginable. When you topped it off with an actual mixture sensor on the muffler that was good as anybody could ever hope to see in a GY6 video. Thanks, that was great. You also actually took the scooter out and first hand demonstrated the nature of how it works. Just over the top!! OOORAHHH!!!

[@1605spadednfaded]

great video man. i searched around for hours trying to find one that explains it like yours. i just installed a new carb on my 50 and it was bogging a little past half throttle. moved the clip up a notch and it smoothed right out. thanks bro

[@uhlbalk]

Awesome job. I finally understand how jets work. Either it clicked after all these years or you knew how to teach us. Props for a great teacher. Thank you.

[@Zeke-yh3cg]

Amen

[@zsiga09]

This was the most excellent video on the subject. The details, the explanation, the testing at the end.. great job!

[@shano4104]

Recently acquired a 2020 Lance PCH 125cc (first scooter ever) that needed quite a bit of love underneath the body panels to say the least. I know this video is almost 10 years old, but this is THE BEST explanation of carb adjustment, what parts are what, all around fantastic! This helped me solve why my brand new carb was boggin down on acceleration , but mainly when coming to a stop . Thanks so much for the video, much appreciated still in 2022!

[@LabCoatPaul]

Thanks for watching! I have many newer Chinese scooter videos you might like. Check out the playlist here: kzbin.info/aero/PL1_JDBt1LSiJQETjZiOFXBKtv-ZzfqEx0

[@mechanacae811]

This is one of the most precise, complete and well done instructional videos that I have seen on the 'tube. Kudos.

[@dkj4183]

Oh yes, one more thing Paul. You certainly know the art of teaching and the teaching paradigm! Thanks again.

[@LabCoatPaul]

Thank you! I'm glad you liked the video. I have a newer video on my channel, about the 50cc carburetor (very similiar to this one) where I explain things much more clearly. kzbin.info/www/bejne/n3Sqm4mIrrNpj7c

[@tonyadams6013]

by far the most intelligent and well presented on you tube. congrats

[@skf3747]

You save my week! Cannot find why my Tomos Velo didn't idle anymore. With your video, I discovered that the idle jet was clogged. Your sharing was greatly appreciated here!👍

[@skudmissal]

Very detailed and informative! Not what I was looking for, but exactly what I needed!

[@jockwalkercampbell]

Simple, clear and through! Very well done! Thank you!

[@Hexsyn]

EXCELLENT video--exactly what I was looking for. Pretty much all other videos on this subject focused only on the jets, maybe on that vacuum pin, but left other info out

[@rogersocalbeaches5734]

Your a genius and that was a great video. I think its the best explanation on the planet, I mean that. Thank you for using the proper terminology and referring to each part by name. It really helps when you know what to ask for when buying replacement parts. Thank you.

[@cathycook1977]

Paul, thank you for your help. I recently took the carb out and cleaned it and put it back on. I had a feeling the best option was to replace it. I will try this and hope for the best.

[@nissanguy38501]

Awesome tutorial! Had rebuilt the carb on mine but still wouldn't start and idle. Watched Paul's video, went back out and tore carb back down, found idle jet was stopped up. Replaced the jet, readjusted carb, runs like a scalded dog now. Thanks Paul!!

[@kareemancher]

This is brilliant! Very informative and I love how stealth that af ratio gauge is

[@diongarbutt8790]

This video helped me so much, I even go back and look again sometimes and see something I looked over, a lot of information. great job

[@CSProduction12]

Thanks a bunch man, been trying to troubleshoot a new scooter sucking to much gas and running high at idle. This info was all I needed. awesome job!

[@pauls466]

THE BEST explanation about these carbs that I have seen so far ( and I have seen a lot)

[@adambarczi6305]

Wow, you are the most pro expert in carburetors I have ever seen. Great experience to watch your presentation.

[@zjeng1]

This has to be the single best carb tuning video out there! There is so much information in this video great job dude. Like the O2 sensor hack :)

[@patscopat]

Outstanding video, very good technical explanation of the parts and what they do. You deffently answered my questions. Thank you.

[@mrzlicek1291]

This is by far the best and well explained video of how a carb work!

[@grant2053]

Wonderful video!!! Great filming and commentary plus practical demonstration!!!

[@chulai1969]

Outstanding! Thorough and understandable, thanks for the time and effort

[@Micscience]

I got to say you did a good job on explaining the carburetor however I learned that when you open the throttle the air increases not decreases because the throttle body plate opens up more as you accelerate allowing for more air and fuel mix to enter.

[@hearthawaii23]

best carb tuning video I have ever seen! thank you so much

[@cinewillp6391]

Very nice video,learned a lot about my POS - like the Riding breakdown!

[@miltecnico]

Super descriptive and knowledgeable! Thank you,great video

[@johngriffin9188]

Excellent video. Helped me understand how the carburetor works. Thanks for the video.

[@danielpapp414]

Well done. You answered a lot of questions that were rolling through my mind concerning the fuel to air ratio and jetting. Great job!

[@smurthmc]

Great video! Very informative. I'm not longer quite as intimidated by my carb.

[@pedrotalavera3541]

The easiest way to determine the mixture is by looking at the color of the plug. It has to be brown, not white or to dark like black. Because it is a carburetor engine. Of course the 02 sensor and gage is a great idea. Great video. Thanks

[@rustypotatos]

Dude I wish I watched this when I first bought my kawi 600 lmaoooo quad carb…. I have learned so fing much that this video was a great course for anyone learning right now. I bought a scoot for my mom and dove into this video to help me on that single carb and LAMO THANK YOU MAN YOU ARE HELPING SO MANY PEOPLE. O2 sensor is nuts btw you are insane

[@LabCoatPaul]

Thanks for watching! I made the oxygen sensor setup a little complicated. You can simply buy a gauge and skip all the electronics work.

[@gregdorsha2335]

Great disassembly / reassembly talk and video and interesting data on road test. Thanks.

[@jasonroberts4701]

I like the way you explain the carb it helped me understand easily

[@stateofthemake4590]

Thanks for this video. It's super helpful in understanding chinese carburateur which can be kind of confusing

[@0617michael]

Very well done you explain perfectly just the video I was looking for

[@brokejaw]

ya seriously this is so well explained for people who know nothing. Thanks!

[@JLSLights]

Best explanation I've ever seen. Thank you so much.

[@BobsZuma]

Still viewing after 10 years, great video to fall back on.

[@morianmed2002]

Thanks a lot for sharing Paul very helpful ..greeting from Algeria more post like this it a real joy .......

[@Grainsauce]

YOU are the man I have the exact same carb on my Tao Tao 150d ATV and have been trying forever to fix the stalling idle problem basically where you let off the gas and it dies.

[@matthewmurphy5052]

Hi, my name is Matthew Murphy. I live in Charlotte Nc. I have a 150cc Chinese motor scooter. I recently had to rebuild the upper cylinder head. I also had to rebuild the carb. Broken jet needle. I just wanted to say Thankyou. The carburetor adjustment tutorial was very helpful. Keep rockin!

[@harrisonaard1]

Nicely done. I'm currently waiting for that carb (and the inlet manifold) to put on my 50, as I'm trying to find the weak link. No amount of playing with jets after porting and skimming the head, and clearing the restrictions of the standard exhaust have made much - if any - difference. Only the CDI change made a good change...

[@SuperBongface]

Good God I just met the MAN!!! Big BIG props for this video Mr. Shpakov!!! Indubitably phenomenal! Many thanks! ...Class dismissed!!!

[@vk2172]

So back in 2012 when I turned 18 I bought a 5th hand chinese carbed motorbike for £550 that after a day of riding kept cutting out while idling, so then i took to the mechanics and they fixed it, which lasted a day then it fucked again and would rev to like 7k rpm on idle. I had no clue what was going on and was frustrated. I was too poor to keep going to the mechanics at the time (working £5 per hour part time, lol) and so eventually I sold the bike and unfortunately never rode again since. Its amazing how much googling I did to try and figure out how to deal with my problem and how I couldn't understand anything from the resources I found back then. Now that I watched this video I completely understand what was going on. Your explanations are so good! Gutted that this video wasn't around back then! Since I'm back in the market looking to buy a Chinese scoot from new (I'm on £18 an hour now! yay!) your videos give me the confidence that I could maintain it. Thank you so much!

[@LabCoatPaul]

Most Chinese scooters are horrible quality. Even though I'm a mechanic and can fix them, at one point I found I was spending $100 per month fixing my stupid scooter. That made it more expensive to drive than a car! A few scooter brands from China are a bit better. I'm currently riding an eTon sport 50. It's made by SYM. It's been running perfectly with no problems at all for 4 months. That's pretty impressive. SYM scooters is a Taiwanese company but their scooters are manufactured in China. They are better quality than most Chinese scooters. You can also consider Lance scooters. 2010 and newer models are made by SYM, and are good quality. Another brand to consider is Kymco. They are also from Taiwan. Japanese scooters like Honda and Yamaha are definitely better, but if you don't want to spend that much money, you can go with SYM, Lance, or Kymco.

[@2011Harvesttime]

Very good job with your explanation of theory and jetting.

[@mthulhu]

This video helped me like no other! Thank you so much, liked and subbed.. make more!

[@joeleeman9886]

I now understand how these work, bravo uploader because 20 minutes ago that was unfathomable

[@garryoleary1672]

Thanks Paul truly Enlightened by your insight thanks and a great video clip

[@delawareteacher1182]

Paul, you are great with an engine! I will try to follow your lead, I just bought a 2008 150cc that needs help. I need help too!

[@kyleblair4546]

Where have you been hiding, awesome video. Make one rebuilding a 150cc engine, hell I will buy it.

[@linasulba6908]

Very clearly explained!! Good lad!

[@jimmyjam57]

Gosh, you're a one man one episode academic machine. Thank you.

[@user-zd9di1fj5u]

God bless you ,you helped much,,i didnt know whereis where after i took it out and didnt remember where the pipes goes..now ok...greetings from greece,

[@larrystancombejr9590]

Man I wish you lived near me! I'd definitely love some help with my project I'll call it!! Love your videos and God bless!!

[@TubbysExplorationsYT]

Not to go into too much hero worship or anything, but THANK YOU! YOU saved my bike! 2008 Znen/Lance Vintage 150-T. Kept acting like it was flooding when I accelerated, sputter, cough, die. After following your instructions, got the carb adjusted so not only does it run again, it goes batshit.

[@TubbysExplorationsYT]

***** Quick question: shouldn't the carb sit firmly on the motor? I've noticed while working on mine that the carb moves up and down while the motor holds still...

[@LabCoatPaul]

jaethenfalcon The carburetor is attached to the rubber intake manifold on one side and the air filter on the other. It is normal for it to move. Just make sure the bolts and hose clamps are tight so you don't get air leaks.

[@Teerzad]

Thank you Paul. Nice demo.

[@dinatarkteruz]

Good comprehensive tutorial mate 👌

[@civilrightspaulus3865]

Very useful instructions, thanks : )

[@antton77]

I must say you should be a teacher well done

[@LabCoatPaul]

Mine also has the non-adjustable needle. I purchased one with a C-clip and it was way off, so I ended up using the original. Adding spacers to the flat top needle will make it more rich. If you want to go more lean, you can get a smaller main jet. If you still need to go more lean, you can replace or modify the piece that the main jet screws in to. I didn't show it, but I actually did that - I shortened the main jet mounting piece by about 1.5mm to lean it out.

[@sandyneveling4883]

Excellent video. The Chinese rubber hoses leave much to be desired, I would suggest that they be replaced with decent hose within 2 years. A tip to fill the carb bowl; I disconnect the hose on the "Y" join that goes to the fuel valve and suck it. This opens the fuel valve and fills the carb.

[@joeydammett2475]

Thanks! Very informative.

[@MorpheusMClerk]

***** 5 stars V10 A 9 extremely informative thank you

[@SyntaxScout]

awesome video very well explained, thanks for your time.

[@capnchip]

Nice video!!! And, very helpful. Thank you!

[@mferg26]

Damn. Well done video bro. Impressive.

[@konstantinosmaounis798]

Thanks for the video, very informative.

[@chrissanchez4775]

thank you for the detailed video.

[@marka6131]

Chris Sanchez

[@gtfilippo]

Well done on a topic you know well. Your detailed explanations are well balanced with just the right amount of technical information. Coupled with a well edited video with unnecessary clutter removed (i.e. showing all screws being tightened) a well presented video. A point of improvement, Idle screw adjustment turns from closed should be consistent, i.e 1 -1 1/2 turns . I have subscribed well done.

[@LabCoatPaul]

Thank you for the compliments! I have a newer carburetor tuning video here: kzbin.info/www/bejne/n3Sqm4mIrrNpj7c it's for a 50cc, but the procedure is the same as the 150, and I explain things much better.

[@eric222006]

thanks found it very helpful

[@craigdaniel3262]

Best video on this and thank you!

[@edwinread3777]

Thank you!! Very VERY helpful.

[@BaldiniChavez]

Thank you for the comments you gave to my son about my daughter's scooter in Tallahassee on the fuel valve. She has an Eurospeed 49cc. She has taken for repair for about 3 times and it seems great when she leaves from there and next day it's bad again. We are so frustrated about it already but we are going to try your advice on the fuel valve. Do you have a video on it?

[@MotoMiles]

The fleebs come and massage the floob and and now you have a full plumbis.Man i take my hat off to you guy .you know your stuff.

[@marttielsila28]

Great video! Thank You so much! :)

[@thecentralscrutinizer5105]

lol, ur wide angle lens makes the needle jets look bent ;)...Great Video

[@gallowsradio]

Tuning my GY6157QMJ after installing new muffler. Backfiring a bit. Way more than one turn on mix-air screw. I think one will do. Your video helps. Thanks...

[@thomasDSoundDesign]

PAUL!? I love you. Great Video. Help me a lot : )

[@marciabuck8625]

Great video; very helpful.

[@rickye7738]

You should probably have mentioned that it's very easy to over heat an air-cooled engine by running it too lean.

[@dansmith6990]

good point!

[@alienlifestyle3768]

Wym?

[@WhitefolksT]

​@alienlifestyle3768 lean fuel mixture will overheat the engine. A little bit rich is best. The fuel helps cool engine down and air cooled engines are easy to overheat.

[@doradorido]

@@WhitefolksTnope, lean above stoich condition will reduce temp

[@MrWhitedizzle]

​@@doradoridoyou have it backwards

[@stoneobject9969]

you was speeding through that school zone lol thanx ill have to watch it a couple times

[@rtcfpv1012]

Great tutorial. Thank you. 👍

[@stevetakimoto1843]

Awesome video...best one on the web.

[@LabCoatPaul]

Thanks! I'm glad you like it!

[@ashithcalicut]

Great video and knowledge

[@updown5238]

Great video! Thanks.

[@gda882002]

great vid ,well done thank you

[@livanolimanolania4340]

thanks for clear explanation

[@chs417]

excellent video Paul! thanks for all the tips and the very detailed explanations. I've just bought a new scooter, 50cc. I've put about 40 miles on it. It doesn't run out at top end. Idle is good, acceleration is good, but it skips/misses at full throttle. You can tell it's not running smoothly at full throttle. The place I bought from is 60 miles, I called them and they sent me a new carb, I'm wondering before I put the new on one, is there an adjustment I should try on the original before changing it out? I'm not sure if its getting too much gas or not getting enough at full throttle, what should I try first? thanks Charles

[@maxm5768]

thanks for shere the knowlage, :)

[@PRL1290]

Excellent video man