Tune Your Chinese ATV Carb

All of these things are slightly different.. Some have an adjustable air/fuel mixture, some do not.. Some have springs keeping tension externally on the idle screw, some don't... This video should get you in the ball park.
If you want to go the new carb route, I've been very happy with the couple PZ20 carbs I've purchased. You can grab one at this affiliate link and I may receive a small stipend from Amazon if you purchase from this link or simply go to Amazon and search PZ20. www.amazon.com/gp/product/B07...

[@BellyUpFish]

Quick Carb Teardown: kzbin.info/www/bejne/j6GwnniLeZ1nhrs

[@seijirou302]

Good video. Here's some info to supplement. There are 2 jets in these, an idle jet and a main jet/needle jet. If your mixture screw does nothing, then your idle jet is plugged and it's running on the main jet. When this happens your idle speed screw will also be extremely sensitive. If it idles fine and the mixture screw works, but if you go near full throttle it loses power or even dies, then your idle jet is working but your main jet is plugged. Both issues require taking the carburetor off and cleaning it.

[@christopherdavis9181]

This is exactly what is happening to my kids 50cc quadebike. Could you possibly post a link for a video to do this as I'm completely new to this and don't have the first clue. Tanks in advance

[@BellyUpFish]

I think I’ve got a spare carb laying around here somewhere, I’ll see if I can make a video.

[@johnnyburgett7215]

@@BellyUpFish hey you ever make that video lol. I just got a grom clone and I bought a nibbi for it. It Boggs if I give it to much throttle to fast but if I kinda east into it, it’s fine? Should I adjust the needle?

[@thomas25082]

​@@johnnyburgett7215 no video yet i guess

[@BellyUpFish]

No, I’ll see if I can make one this week.

[@leskavage]

Nobody else on KZbin can explain how to tune a carb as well as you did. I'm glad I found your channel. I'm going to be a combustion engine wizard, now! LOL Thanks, man!

[@briansmith611]

There is NOTHING to "tune" other than changing jets and turnning the air bleed 1.5 turns from lightly seated

[@BellyUpFish]

Pretty sure we can file “turning the air bleed screw” under “tuning.” 😆

[@Ashroyer86]

They certainly can. This wasnt a thorough explanation by any means.

[@jorgepizarro8142]

I concur ❤

[@andrewvela2266]

WOW. I have this same RTV and have been banging my head trying to get this thing running. Thank you so much for doing this. My daughter will be so happy I got this thing running again!!

[@BellyUpFish]

Andrew Vela Glad you could get your kiddos ATV going!

[@ricvilla3919]

@@BellyUpFish p

[@bryancourtney8884]

Thanks for taking time to do this video. Had just what I was looking for.

[@BellyUpFish]

Glad it helped!

[@no1jeep88]

Very well explained! Hands off, and yes, those chinese carbs are a bit slower in throttle response than a keihin or mikuni. but still they do the job. witch at the end of the day, brings you smyles :) :)

[@NewEngland_Outdoors]

THANK YOU, MY SON WILL BE SO HAPPY ! I've been tinkering with his machine for a day or so. This really helped !

[@johnburdette2730]

Thanks man! Easy to understand and straight to the point, worked perfect!

[@BellyUpFish]

I’m glad it helped.

[@dougbenson8975]

Sometimes the air/fuel screw comes with a little plug covering it. If you use an 1/8” drill bit and very carefully and slowly drill into the Center of this plug, it will eventually catch and pop it out revealing the adjustment screw 👍

[@gamefreakdanielBIGD]

Omg I think you just saved me from going out getting another carb, I got a new Chinese pit bike 125 and it didn't have no idle screw or air but there is these rubber stoppers hmm 🤔

[@mikeplays1163]

Well i probly messed up idk if i drilled too far and i 100% used the wrong drill bit and think i destroyed the screw face

[@articat568]

I actually am checking the jets on my new carb for this thanks for the tip

[@leegraves101]

Sometimes you need to drill a hole and screw a sheet metal screw into it . Then grab the screw with some pliers and yank the plug out.

[@Dazza2292]

Thanks a bunch, i had just cleaned a newly acquired to me 70cc orion. It worked fine until warm where it woulf stumble and stall, i remembered this video and now it appears to be running lovely and not stalling out

[@kevparnell7374]

Thank you for this, you will sense it really made me chuckle !!!

[@lewismyers4790]

Dude I ain't no lie,you made that so so simple explaining the idle and air fuel mixture,no rambunctious beating around the bush astronomic do it yourselfer video I ever seen,dude THANKS,straight PLAIN to the point no CHASER,just the task I needed to see,😊THANKS guy!!!!

[@BellyUpFish]

Man, I'm glad you found it helpful!

[@stannelson2582]

Daughters just learning on their s so a bit of a bog and low idle are a problem for me. Your video is great and thanks for the help. Happy Father’s Day

[@oppazzgwala3700]

Thanks man finally got my bike to idle perfectly after this video

[@camcraigsadventures7114]

Great video. I was able to get my sons quad, i purchased used, running in these few easy steps. Thanks a lot.

[@BellyUpFish]

Excellent! Glad it helped!

[@bacon4592]

Thank you I have been having a rich problem and I'd dint know how to tune it but now I do thank you

[@BellyUpFish]

I’m glad you found it useful.

[@INSTRUMENTALS650]

This is the best damn carb tutorial I've seen yet.. i finally get it now

[@BellyUpFish]

Dylan Diel Glad it helped!

[@rickeybobby2638]

Best video I've seen so far Great job

[@tikial5221]

Thanks Mr. Fish 😁 I was going 1 1/2 turns. They're definitely cheap but when running right they're fun and the kids love them.

[@fishfingers1985]

Thank you man! You explained it perfect simple.

[@xkammo]

OUT OF ALL OF THESE VIDEOS THIS ONE WAS THE ONE!! Thank you brotha. My 2020 125cc Coolster Dirtbike is able to idle now 💯

[@BellyUpFish]

I’m glad it helped!

[@claytonriley5920]

Thanks so much! My little 90cc quad wasn't idling good so I tried this and it worked!

[@BellyUpFish]

Happy to hear it was of some benefit for you! :)

[@Luisperdo]

The best video and the best explanation of how to tune a carb thank you for sharing it 🙏

[@javiersegovia4473]

These guys commenting are right. A fine tune with a fine explanation. Thanks!

[@BellyUpFish]

Glad it helps! KZbin has helped me so much, it’s nice to just be able to help others with what little I’ve got. ;)

[@y0unqkhalifa]

Very simple not 20min long video about nothing. Thanks homie

[@memessimonides3945]

Great simple and helpful tutorial 👍

[@BellyUpFish]

I'm glad you found it helpful!

[@lukestauber2276]

Good video. Love the name and the "your kid will think you're a combustion engine wizard" to end it lol

[@entertext5420]

You do good job!

[@GrotyGold]

Nice work mate great info.

[@kai49932]

Buddy you helped me fix my ATV buddy your awesome

[@georgesmith6154]

Thanks to you I figured out my issue. The gas/air mixture set screw is snapped off. It came from the factory like this and I'm happy to have an answer. Thanks again.

[@BellyUpFish]

Glad it was of some use.

[@omexgazplayz6298]

So how did you get it adjusted

[@georgesmith6154]

@@omexgazplayz6298 I just went and bought a new carburetor. They are less than 20 bucks on Amazon.

[@redbull21ca]

@@georgesmith6154 are the carbs interchangeable? I just bought, apparently a predator 250cc, but vin number shows no such things, other then conquinghensim Corp. Lol I cleaned the jets, replaced the fuel and replaced the relay fuse, it idles fine but when driving, misfires and backfires

[@BellyUpFish]

Yeh, for the most part, many of these Chinese quads all use the same style/size carb.

[@keokiaki5647]

Another way I do it is raise the rear wheels off of the ground and full throttle at the same time adjust air fuel mixture screw. Found that to work for me.

[@katlyneberhardt2193]

Pop the chain off.

[@KINSHELLAKUSTOMS]

🙏🏼 awesome video. I can fix anything and build almost anything But tune a carb 😹 not me lol . This has been the most helpful video on these chines carbs and trust me a have watched way too many lol , you rock 😎👍🏻 . I’m building a drift trike out of a junk CATV . Finely got it running now I’m just cleaning up the wires .

[@BellyUpFish]

Thorn Life Glad it helped!

[@odi_de_podi]

That little 'sense it' joke made you have another subscriber. Exactly my kind humor

[@BellyUpFish]

Odi Well thank you. Maybe I’ll post something else you can find useful. ;)

[@waynegarrett1614]

my son called me a 'come bus onion' engine wizard, close enough I guess, thank you for such an easy to follow video and making me look cool in front of my son and his friends!

[@madhousebaby]

Me this weekend 😂

[@BellyUpFish]

You’ve got this! 😆

[@cjlst8]

My man! Got rid of the sucking noise at low rpm. Purrs like a kitten and runs like a champ.

[@nabeela6102]

Thank you for me I turned it tight and it worked

[@damiensutton1057]

Good one mate I will definitely try this I’ve got one that’s doing the exact thing

[@kaungpyae3464]

Now I don't have to go to shop just for this problem... Thank you💪

[@BellyUpFish]

Glad I could help!

[@jdlitson]

Now people at the shop are wondering why business is so slow.

[@AntonioHernandez-yt2sv]

Thank you I saved two $200 That’s what the guy or mechanic try to charge me thank you so much bro

[@BellyUpFish]

Antonio Hernandez That’s great! You’re welcome.

[@HONOR-dn4zi]

That's a scam mechanic damn

[@Tahmanakki]

Thats a shitty ass mechaniv

[@tdub2399]

Thank u sir awesome video much appreciated!!!

[@BellyUpFish]

tdub2399 You’re welcome. Glad it helped.

[@timgiesin4025]

Thanks for the video this might help my quad

[@jsk1464]

You're the man, thanks!

[@TheLayinLo]

Thank you! I now have wizard powers. Sincerely, thank you!

[@kylesyx8432]

If you plan on improving existing exhaust, you may wanna get increase flow the way you like it , then this carb can do so much more! Save someone sometime maybe a headache!👍❤

[@jamesgraham6778]

Thanks dude helped a lot

[@MissingLinkMTB]

I've always brought them a quarter turn out after finding peak rpm. Richens it a bit for when you whomp on the throttle so she'll go. These seem picker than the big bikes I've worked on in the past though. I'd like to see what a stepped flywheel key would do for the ignition... give 'er a little advance for better throttle response. Not so much Mo Powa, but rideability.

[@BellyUpFish]

MissingLink MTB They certainly seem more picky than bigger bikes.

[@mattandcrystal1984]

I feel like if you raise the needle it may also help. I've just started playing with these chinese ATVs and the cheap carbs are pretty finicky I've found. I bought 2 new ones that run perfect and then bought a 200cc to play around with. It needs some work and somebody put a MOLKT carb on it. It's been a learning curve. At least they're cheap to beat around on.

[@larondalawvere2646]

Thank you , helps a lot

[@enriquevaldez2108]

Very helpful thank you

[@LineupLegend]

Great info. Thanks

[@BellyUpFish]

Glad it was useful to you.

[@andrisak4795]

you need a gold medal this is the best totorial ever sub and like

[@BellyUpFish]

AndrisBoost If it helps 1 guy help his kid have a better day, that’s medal enough. ;)

[@raulramosroolies2544]

Helped me out good video

[@kylebowman4161]

I think I'm more impressed with your starter actually working lol

[@BellyUpFish]

The starter is about the only thing I’ve haven’t replaced. 😆

[@Moparbarnett88]

Great video. Which screw do I need adjust if the carb is acting like it has not enough fuel under load. New go kart but after a long run it'll give a hard time starting and die when pressing the gas pedal

[@murrayminimotors1674]

Very helpful 👌 ☺️

[@AndreyNabutovsky]

Thx man ! Appreciate

[@leodaniels2554]

Helped me a by a Million times.

[@tunerforlife2274]

Thanks boss I’ll try this

[@StewartLMcGill]

Our Tao Tao 110cc LIVES!! We couldn't figure out why it had slowly degraded in performance. We followed your video and not it flies again! My 10 yr old Thanks you very much!

[@BellyUpFish]

Stewart McGill Excellent! Glad it helped! Hope you had a great Father’s Day.

[@JackDiCindio]

me and my father bought a 200$ tao tao 125 and we got it running again.

[@deborahchesser7375]

ッJackie cool, is it still kicking?

[@JackDiCindio]

@@deborahchesser7375 nope, eventually got so unrepairable just dumped it. we bought a bunch of new parts for it, to no avail. just bought a 1999 yamaha breeze 125 and its a beast.

[@josephbaeza6699]

Maybe that explains why you picked it up to 200, totally sucks

[@xcatver69]

Thank you!

[@BellyUpFish]

Welcome.

[@tjnucnuc]

Hey I know this is ak old video but when do you need to move to bigger jets? Because I’ve heard after you start to modify you’ll want a bigger carb and to try different jets. Couldn’t I just richen my stock carb out a little with the screw?

[@user-zn8ep7ls2p]

Thanks very much 😊

[@camcraigsadventures7114]

Sir, have you ever wired remote start/stop using harness from Amazon for the 50cc quad? I cannot find the 6 and 2 pin plugs it is referring to.

[@BellyUpFish]

Wish I could help, but I have not.

[@davidwhinney1954]

Any info on electric chokes...dont think mine works, but how do you know and if its un plugged will it be open or closed? Great vid by they way👍😉

[@danielk8149]

The Kodiak carb I ordered from Amazon did the same damn thing idles good but craps out when I give it gas unless it's on half choke and I see no other adjustment screws except the one with a spring on it. forgot what ya called that one

[@mNaitioN]

Thank you!!

[@351kostakis]

Fantastic

[@murrayminimotors1674]

Very helpful 4 my shop n channel 😀 thanks

[@jaydab]

Great Video‼️ Combustion Engine Wizard... 😂😂😂

[@m4st3rm1nd85]

the full turns save a lot of time lol

[@lesrivieresgites1464]

Thanks for that boss

[@tyjohnston5889]

Thanks!

[@draakje-kf8zi]

Thx it helped alot

[@BWADaniel]

Everytime I go to youtube something, my shit is always different 😂. I have only one adjustment screw on both my ATVs. 250 and 155z HO

[@BellyUpFish]

I know the feeling. One of our 125’s was like that....

[@whowho7969]

Thank you 👍

[@BellyUpFish]

Happy to help!

[@AidanBrooks137]

Is it normal that the idle screw that there’s a pic on the over side of it that sprays out fuel?

[@JamesMcGraw-ph1el]

I get a slight full throttle bog but it picks up a little bit if i play with the choke, any advice??. The video was very helpful thank youu🙏🙏

[@BellyUpFish]

Sounds like it could be going lean. I'd try to tune it a little more.

[@bobbydigital1975]

Good video

[@BellyUpFish]

Bobby Digital Thanks. I hope it helped.

[@AlexanderStewart-ix6cc]

My question. If I were to turn the idle screw all the way in how many turns out before it's set to where it needs to be to where I can start adjusting it or tweaking it a little bit?

[@BellyUpFish]

2 to 2.5ish.

[@gilberto.t.y.hernandez7491]

Asome Thank you .

[@BellyUpFish]

Glad it helped.

[@johnnyturbo8460]

Any thoughts on porting/polishing the intake runner? Or do you leave them stock?

[@BellyUpFish]

Johnny Turbo I’ve never really thought about it on these. Might be worth a shot. If I did it, I probably wouldn’t go to a high polish like 2000 grit. I’d probably stop somewhere around 600...

[@johnnyturbo8460]

@@BellyUpFish 🤔 i may give it a try. Why not lol. I love tinkering, especially if there is performance to possibly gain. 😁👍

[@misterpopper77]

M6 (main jet) are too small for my pz22 carb, are there M7 main jets?

[@jeffrogosz7198]

2005 wilderness Baja 250cc I have one it will idle but not rev I thought maybe the carb needed cleaned

[@terrellhibbler4338]

Mines won’t start and if it does it cuts right off. Any idea what the problem could be

[@johnnyher9003]

Thnx brother

[@daydaylol209]

Whats the jetting your using ? The link in your desciprtion come with stock jetting?

[@BellyUpFish]

I’m running stock jetting.

[@rafko6297]

Hey, wondering if i set it to a higher idle, what will the difference be? Acceleration? Btw good video 😁

[@Cultofpersonality09129]

It’ll bog less. I prefer these to idle higher that this.it doesn’t bog and it comes back down to idle better. I don’t go just by the mixture screw, I also read the plug.

[@jacobgregory3916]

Thanks

[@leoryan1276]

My chinese scooter was running until i tried to get the idle sorted but i turned the fuel mixture screw and now i cant start it its a keeway pixel 50cc

[@bryandobbs3116]

Did all that. Thanks. Mine bogs down when pressing the throttle all the way. Any advice?

[@BellyUpFish]

Bryan Dobbs What color is your spark plug? You could have a vacuum leak. Take a can of carb cleaner and spray it around the engine, while it’s idling. If the RPM’s increase, you’ve got a vacuum leak.

[@BikeLyfeCeas]

@@BellyUpFishI spray car cleaner and it turns off

[@wereallgonnadiefromnukesoonlol]

All I can say is thank you lol

[@BellyUpFish]

Glad it helped.

[@richarddziak2416]

Do you know what causes my ATV it dies bogs down at WOT. I placed new carb spark plug adjust pre your video. No power at open throttle

[@seijirou302]

Carb needs to be cleaned, your idle jet is working but not your main jet.

[@3tooga172]

I just bought a new carburetor but I don’t know where does the lower pipe with the string go

[@BellyUpFish]

I'm not really sure what you're referencing when you say the "string." You can shoot me an email at jeff @ myebaychannelname dot com with a pic and I'll try to help you.

[@lewismyers4790]

Hey guy,Lewis again,I gotta Raytech 125cc atv,I noticed it doesnt have a air fuel mixture screw just a idle screw is it any way I can adjust my air fuel mixture? Or is it just time for another carb? 🤔

[@BellyUpFish]

I'd probably just throw another carb on it. For $15, it's not worth trouble shooting too much.

[@barryarrowood6814]

So where is the idle screw set at from the beginning.? If I turn it all the way in how many turns out to be around the correct area to test. I can get the quad to fire up an run for a few seconds but I have to stay on the throttle to keep it running. But it only will run for like 10 seconds max.

[@BellyUpFish]

2 turns.

[@BikeLyfeCeas]

What did you do to fix

[@dariusbutler84]

Awesome video! Question, there's a rubber hose from the air filter to somewhere on the engine. What is that and do u need it. Put a k@n filter on son's atv and don't know if i should drill hole in filter like factory, or just leave off. Thanks!

[@BellyUpFish]

Darius Butler That’s your crankcase breather/vent line. It lets the build up of gases in the case vent out. You can either route it to the K&N or buy a small filter for it at the local parts store or internet.

[@dariusbutler84]

Ok thank you for letting me know!!

[@BellyUpFish]

Darius Butler You’re welcome.

[@cjlst8]

Darius Butler... I didn’t know either but I just drilled a hole in the new carb air filter and reattached the hose with a new inline filter

[@cjlst8]

Runs great

[@purplemanticore6830]

What do i do if my atv has a metal plate covering where the air fuel adjustment screw is? I have the same atv as in the video btw. I can post a video showing it if needed.

[@BellyUpFish]

Sounds like you might be referring to a Welch plug. If that’s the case, if you have an air compressor, drill the smallest hole you can into the center of the plug and then blow compressed air into the hole and the plug will come right out.

[@dsd-downshiftdave8056]

I feel like this problem started after I gave it a wash?

[@anthonycaravello9205]

If you bought and put a good carburetor on there the throttle respond would be a lot better.

[@BellyUpFish]

No doubt, maybe I should look into one.