Two-Stroke Scooter / ATV Carburetor Settings And Adjustments 2of4 : Idle Speed & Mixture

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  • Опубликовано: 11 янв 2025

Комментарии • 773

  • @PhuriousStyles
    @PhuriousStyles 3 года назад +86

    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

    • @robfraser33
      @robfraser33 Год назад +1

      I agree. I was having so many problems and getting excess information on other channels. This broke it down barney style!

  • @Mr65Mee
    @Mr65Mee 8 лет назад +67

    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.

  • @p.c.h.6721
    @p.c.h.6721 5 лет назад +13

    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 🙏👍👍👍

  • @Takeit2kyle
    @Takeit2kyle 9 лет назад +113

    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

    • @jamppa80
      @jamppa80 6 лет назад

      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??

    • @danielduflot5388
      @danielduflot5388 6 лет назад

      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

    • @nicumartac670
      @nicumartac670 4 года назад +1

      @@jamppa80 11111¹

    • @baglifetrapstar5376
      @baglifetrapstar5376 3 года назад

      🤣😂😭🤔😂facts

  • @lakinduanuhas7878
    @lakinduanuhas7878 4 года назад +10

    After 8 years,and right on time when i needed this,great work and thank you

    • @dkm016
      @dkm016 4 года назад +2

      Haha! Me too. I'm guessing it's 2-1/2 turns as mine was never adjusted properly..

  • @tinyturbo7664
    @tinyturbo7664 5 лет назад +5

    By far the best and easiest well said of this type of carburetor adjustment on RUclips.

  • @RobbiRocks
    @RobbiRocks 8 месяцев назад +36

    It's difficult to adjust these to that "Sweet spot" when you can't get the engine starting to begin with

    • @andrewbdaa4433
      @andrewbdaa4433 3 месяца назад +2

      Best way I’ve found to help with this, set the tuning back to factory tuning(usally 3 full turns out for both air and gas screws) then give it a quarter turn back in on the gasand it should be enough to start the bike until you can actually tune it. It’s just 50cc that are an ass because of how exact you have to be sometimes

  • @pcmcobra
    @pcmcobra 8 лет назад +3

    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!

  • @rhadiem
    @rhadiem 12 лет назад +9

    Thanks so much man, this is what I needed to know. Not many carb videos cover both both screws.

  • @AndrewPietersen-gu4rd
    @AndrewPietersen-gu4rd 2 месяца назад

    My goodness so simple you have explained something so simple to do. Well done mate.....Andrew of South Africa.

  • @christopherzuckerman6784
    @christopherzuckerman6784 10 лет назад +5

    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..)

  • @ndominguez1982
    @ndominguez1982 7 лет назад +1

    im working on an '85 Honda Aero 80cc thats been in an attic since 1987 with a full tank of gas. These past few days have been a nightmare! Turns out, they havent made gas tanks for this scoot since '87, and this is too far beyond repair. Ive worked on tons of Chinese scoots using your help. Now, I can thank you for helping with this one. The air restrictor was stuck wide open due to some gunk build up even after ive cleaned and rejetted. i finally just looked throught the dang thing after this video and saw it stuck wide open. Its too late to try and get it running tonight with the kids being asleep, and I have to work all day tomorrow. Now its going to be on my mind all day! Thanks AGAIN!

    • @49ccscoot
      @49ccscoot  7 лет назад

      Good luck with it. Hope that does it for you.

  • @mikkelkjrulff359
    @mikkelkjrulff359 4 года назад +11

    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

  • @pavelmichalek108
    @pavelmichalek108 Год назад +1

    Thank you for this simple video without any bullshit, nicely straight to the point

  • @nickklein9715
    @nickklein9715 7 лет назад +18

    Finally a video for novices, thank you!!!!

  • @robfraser33
    @robfraser33 Год назад +1

    Thanks for breaking this down barney style! Helps 100%

  • @Super1handed_rc
    @Super1handed_rc 6 лет назад

    I just got a 450$ Chinese scooter and man the carb is giving me a real hard time I ordered a new one after trying to clean the old one several times but your videos have helped so so much thank you

  • @RysReviews
    @RysReviews 6 лет назад +4

    Great video. Simplifying the dark art of understanding a carb. Much thanks.

  • @jr260551
    @jr260551 7 лет назад

    This is great, similar principles to italian scooters i.e. derbi model with piaggio motors. My Scooter was running way too rich as indicated by the soiled spark plug. The scooter recently developed a significant vibration at about 1/4-1/2 throttle and at idle. After turning the idle mixture screw out about 8 full turns, the scooter idles much more smoothly, doesn't lag on take off and doesn't vibrate anymore. It actually has never ran this smooth. Great explanation of the process and how the carb works! Thank you. 2007 Derbi Atlantis Bullet 49 cc with piaggio engine.

    • @49ccscoot
      @49ccscoot  7 лет назад +1

      Be careful. If turned out too far the screw gets loose and can loosen further with vibrations and end up falling out. Replace the idle/pilot jet if necessary to make sure the screw can be adjusted without it being too loose.

  • @musician48195
    @musician48195 7 лет назад

    Because of you my Yamaha CA50 runs again . Thank you for a very easy vid that most of us can understand.

  • @AntonyCartwright
    @AntonyCartwright 2 года назад

    Yes!! Finally... A simple explanation. Thanks!

  • @skisuit
    @skisuit 4 года назад

    I’ve been looking a video like this for months!!!! Perfect

  • @ramsayfraser2003
    @ramsayfraser2003 3 года назад

    Can’t even explain I’ve been trying to find this video for forever exactly what I needed you helped a lot ❤️

  • @zeushernandez2449
    @zeushernandez2449 3 года назад

    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

  • @williamedwards7315
    @williamedwards7315 2 года назад

    I've looked up how to adjust mixture screw 300 times in the last week no one said anything about trying to get it to idle as high as you can with the mixture screws no wonder why I can't get my sled mixture screws right now tomorrow I can go out there and turn them one and a half out and then start turning them until I can get my highest idle and then back off my idle screws until I'm at my preferred RPM idle thank you !!!!!!!!!!!!!!!!!!

    • @49ccscoot
      @49ccscoot  2 года назад

      Hope it works out better for you this time!

  • @wassonii
    @wassonii 12 лет назад

    Thank you! I've been having a carb issue(keihin pb16/kymco like 50 2t) & took it apart for the first time today. At a point when changing the main jet (w/out fully removing the carb from the engine) I 'adjusted' the float w/out realizing. I put the carb back together properly, but the engine isn't firing (w/good spark and compression). A suggestion has been made to alter the idle mix since my plug is wet. My carb is different than this one, but it is very helpful to get a visual & explanation.

  • @kevinstearns4198
    @kevinstearns4198 10 лет назад

    this is the best guy for these videos.

  • @simonManleeeee
    @simonManleeeee 7 лет назад +9

    Thanks for the video, useful stuff

  • @michaelwalker2345
    @michaelwalker2345 10 лет назад +14

    This helped me a lot with my honda City express from 1989. Thanks :)

  • @alanblenkinsop2775
    @alanblenkinsop2775 Год назад

    Excellent tutorial will try this on my 350 LC it’s bogging at low revs up to 3000 rpm then it’s off like a scolded cat nice work mate

    • @49ccscoot
      @49ccscoot  Год назад

      Give it a try since it can be quick and simple if the carb is easy to access. If it's RPM dependent and not throttle position dependent though, you may have something else going on... like a clutch issue for example.

  • @paulhammond3590
    @paulhammond3590 7 месяцев назад +1

    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

  • @jimbob12382
    @jimbob12382 3 года назад

    Very good video straight to the point no messing about thank you!

  • @herminigildodelacruzjr1752
    @herminigildodelacruzjr1752 8 лет назад

    all your video are so clear and easy to understand again pls continue to make more video thanks

    • @49ccscoot
      @49ccscoot  8 лет назад

      Thank you. I will keep going.

  • @zsomborszatmari1518
    @zsomborszatmari1518 3 года назад

    You dont know how mutch you helped me. Thanks!

  • @zeushernandez2449
    @zeushernandez2449 3 года назад

    Yup thank you officially I just adjusted both my screws and it’s running perfectly thanks bro really appreciate it wish I could give u more 👍🏻because I would

  • @Dump_Dum
    @Dump_Dum Год назад

    Best video on RUclips

  • @jalaj121
    @jalaj121 5 лет назад +1

    Thanks for the video... It was very helpful...keep it coming...

  • @girishkarajgi2732
    @girishkarajgi2732 8 лет назад +4

    thanks man. Found it Really help ful.

  • @simonc5313
    @simonc5313 3 года назад

    Thank you. My little lads quad bike idles beautifully now.

  • @DJKA
    @DJKA 4 месяца назад +1

    Very helpful thank you!!
    Where on this carburetor is the fuel inlate, at the front or at the top?

    • @49ccscoot
      @49ccscoot  4 месяца назад

      It's the big barb at the top. Watch near the end of this : ruclips.net/video/UipC6DLD-EE/видео.htmlsi=PuMtbGcDENr_K4FJ

  • @charliemcintosh93
    @charliemcintosh93 2 года назад

    THANKS.. BIG HELP AND EASY TO UNDERSTAND... 5 STARS....

  • @jeffrogensues6617
    @jeffrogensues6617 11 месяцев назад

    KISS, you are the champ Thank you

  • @godfreygiddings2275
    @godfreygiddings2275 2 года назад

    Yo bro u really helped me bro best explanation lov it now ik how to set me screws

  • @brunocelano5059
    @brunocelano5059 2 года назад +1

    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 😎👍🏼

  • @barnesandrewj
    @barnesandrewj Год назад

    You a legend dude, thank you!

  • @DimebagCFH4Life
    @DimebagCFH4Life 11 лет назад

    Hey man thanks for the video I used the guide on my kymco agility 50 its a different version of the carb but its the same thing. the sweet spot for my scooter is 3 full turns out from all the way in. My scoot doesn't have a tach but i basically set the idle to a hair under the tyre starts moving which is nice. I will suscribe to you its hard to find people there days that can even service a carb, Well at least locally lol cheers

  • @TheJonc900
    @TheJonc900 12 лет назад +1

    thank you a video where i actually learned something

  • @CapeComorinStudios
    @CapeComorinStudios 7 лет назад

    Thanks for the very best explanation of all screws. Thanks again

  • @Jack-ns5zc
    @Jack-ns5zc 5 лет назад

    Finally a video on adjusting screws. What is usually stock on a carb just roughly as I’ve rebuilt my carb which was all blocked up with the wrong adjustments?

    • @49ccscoot
      @49ccscoot  5 лет назад +1

      1.5-2 turns out is usually a decent starting point for the mix screw. For the idle speed, you can make sure it's raising the slide a little and then you'll figure that one out quick enough when it's running.

    • @Jack-ns5zc
      @Jack-ns5zc 5 лет назад

      90GTVert 1.5 to 2 turns out from all the way in or flush with the sleeve?

    • @49ccscoot
      @49ccscoot  5 лет назад

      @@Jack-ns5zc Any time "turns out" is stated, it should be from seated (all the way screwed in).

    • @Jack-ns5zc
      @Jack-ns5zc 5 лет назад

      Ah right, cheers

  • @jeremyturner6173
    @jeremyturner6173 3 года назад

    Another great video. I been haiku problems with my carb sticking

    • @49ccscoot
      @49ccscoot  3 года назад +1

      That could prose quite a problem. A lot of times sticking is from the cable/throttle setup so check those.

    • @jeremyturner6173
      @jeremyturner6173 3 года назад

      I had time to take off and clean. Since we had all this rain. Seems ok now

  • @Platinumtag
    @Platinumtag Год назад

    Just the right info i needed..

  • @zameerramdianee5718
    @zameerramdianee5718 10 лет назад

    Totally helpful while you were showing how it works inside the carburetor.

  • @rene8564
    @rene8564 12 лет назад

    Are you forgoing potential improvements in performance by choosing an airbox over an open filter?
    By the way, once I get my PayPal account funded after the holidays, I'm going to join your site, even though I'm a 150cc guy. That way, I'll be able to contribute a little something in appreciation of these vids. I encourage those who feel they have gained valuable knowledge from them to do the same. I'm a broke English teacher in Mexico, but this knowledge has served me well.

  • @autopediacom
    @autopediacom 7 лет назад

    Best explanation ever👍👍👏

  • @jhunel1369
    @jhunel1369 7 лет назад

    nice.. now i could simply tune up my motorcycle. tnx

  • @EdwardStorlien
    @EdwardStorlien 8 лет назад

    Great video, keep 'em coming!

  • @dunfordhousedunford7282
    @dunfordhousedunford7282 Год назад

    Great vid. Thanks!

  • @wouterparmentier7297
    @wouterparmentier7297 4 года назад

    Good explanation man, Top!!!

  • @cubey
    @cubey 3 года назад

    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.

  • @arslanhaider1455
    @arslanhaider1455 7 лет назад +1

    thank u very much sir for free knowledge

  • @oliver5976
    @oliver5976 4 года назад

    Fantastic video thanks man

  • @user-Chaseanoris
    @user-Chaseanoris Год назад

    just love this video great sir

  • @67kneil
    @67kneil 12 лет назад

    Very well explained and detailed

  • @BrodyCox
    @BrodyCox 11 лет назад

    I've got an '86 Jog as well, and I know exactly what you're talking about. Usually this was done by the factory as a way of discouraging people from tampering with air/fuel mixture adjustments and adding aftermarket components. A real pain, I know. I got a Chinese clone carburetor for mine, which had the air/fuel mixture screw. Took some modification to get it in, though...

  • @peterandmelissaholmes9862
    @peterandmelissaholmes9862 7 лет назад

    Top video mate

  • @blakeypoo4u132
    @blakeypoo4u132 4 года назад

    Awesome video

  • @yohanmendes8038
    @yohanmendes8038 5 лет назад

    Wonderful buddy very informative thank you so much

  • @sunairjet
    @sunairjet 11 лет назад

    The exhaust has been adjusted properly many times. But just kick starting it (Before the engine starts) it sounds exactly like a motocross. And it has that pure 2 stroke smell all the time.

  • @LogiForce86
    @LogiForce86 Год назад

    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.

  • @jonah5908
    @jonah5908 7 лет назад +7

    This is the best fucking video I've ever seen

  • @jroberts2226
    @jroberts2226 7 лет назад

    A well made video and a good insight to carburettors. It would be even better if an explanation was given as to what the outcome would be on the different adjustments made . Still a Ten out of Ten on carbs. Thank you 90GTVert.

    • @49ccscoot
      @49ccscoot  7 лет назад +1

      Not a video, but here's more info on carb tuning :
      www.49ccscoot.com/faq/carbtune.html

  • @josepeixoto3384
    @josepeixoto3384 6 лет назад +6

    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.

  • @smicka123
    @smicka123 11 лет назад

    great video dude :)

  • @wassonii
    @wassonii 12 лет назад

    Right on. Thank you! Kymco has this one so restricted, there is no control over air/fuel mix (other than the idle mix) and the needle can't be adjusted.

  • @cesarchd6499
    @cesarchd6499 5 лет назад +2

    Excelente video amigo desde Colombia gracias

  • @04mudder
    @04mudder 11 лет назад

    I cleaned the carb and its clean as hell now should i make the idle mixture richer

  • @HogriderX100
    @HogriderX100 7 лет назад

    Brilliant informative video THANKS

  • @basimfara
    @basimfara 8 лет назад

    Hi thank for this a value video I really learned a lot. I wish you make a video adjusting the air screw&idle screw on a live motorcycle so we can hear the best idle and recognize the sweet spot.

    • @49ccscoot
      @49ccscoot  8 лет назад

      ruclips.net/video/5SuIL9EtUZ0/видео.htmlm15s

    • @basimfara
      @basimfara 8 лет назад

      I repeated this clip so many times, almost I succeed .
      Regards

  • @poolman8676
    @poolman8676 Год назад

    That was awesome and to the point. Should I start with a new plug or a clean the plug? Or does it matter ?

    • @49ccscoot
      @49ccscoot  Год назад +1

      If your just starting out, as long as it's not fouling you're OK. If you get to fine tuning, especially higher throttle settings, then maybe put a new plug in.

    • @poolman8676
      @poolman8676 Год назад +1

      @@49ccscoot wow thank you man for responding so quickly. It's not fouling the plug, just kind of gutless. The other Eton viper is much snappier. Both are Eton Viper 90s. Getting ready to sell them. Kids out grew them and want someone to enjoy like we did. Thx again.

  • @EliminatorPerformance
    @EliminatorPerformance 6 лет назад

    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?

    • @49ccscoot
      @49ccscoot  6 лет назад +1

      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.

    • @EliminatorPerformance
      @EliminatorPerformance 6 лет назад

      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!

    • @49ccscoot
      @49ccscoot  6 лет назад +1

      Awesome. Glad to help!

  • @supergamingdogegamer3709
    @supergamingdogegamer3709 4 года назад

    Hi this was very helpful I just brought a aeon mini kolt with a oil injection all pipes missing and not sure where to connect the oil was wondering if you could give me some advice thanks

    • @49ccscoot
      @49ccscoot  4 года назад

      In this video, the oil injection port is the one above the idle speed screw. You'll often see that it's a barb with a large base, because many (not all) house a check valve with a ball and spring in there.

  • @Spartan2551
    @Spartan2551 7 лет назад

    I"m in the middle of cleaning up my cousin kids atv's.. It missing hose's and out of adjustment . This video explains a lot. But one thing i am not sure of it what that Barb fitting above the idle screen used for?

  • @merrilldoyle8300
    @merrilldoyle8300 10 лет назад

    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!

    • @49ccscoot
      @49ccscoot  10 лет назад

      What happened each time it died on you? ... Wide open throttle... cruising... came to a stop sign... made a noise... etc...

  • @ShowNoMercy87
    @ShowNoMercy87 11 лет назад

    the belt looked fine. idk what you mean by "If it gets narrow it won't ride as high in the variator for best speed" ?

  • @kennystrosse121
    @kennystrosse121 11 месяцев назад

    Thank u for the help

  • @jmc25231
    @jmc25231 Год назад

    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!

    • @49ccscoot
      @49ccscoot  Год назад +2

      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.

  • @seanmayo206
    @seanmayo206 5 месяцев назад

    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

    • @49ccscoot
      @49ccscoot  5 месяцев назад

      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.

  • @alimsuzuki8125
    @alimsuzuki8125 2 года назад

    good job

  • @mowerrepairshopfortscottkansas
    @mowerrepairshopfortscottkansas 9 лет назад

    Thanks For The Tips

  • @didnthurt4077
    @didnthurt4077 5 лет назад

    This is one of the better guides for adjusting tje carb, thanks for that! Still have some questions tho.. how many turns out on the idle screw is a good way to start when starting from scratch? Also, is that all made without the choke pulled in right? Usually if i start cold i need the choke in to even be able to start.

    • @49ccscoot
      @49ccscoot  5 лет назад

      Don't tune with the choke. Let it warm up, then tune. For the baseline guess on a new carb, try watching the slide and turn till you can see that it has opened just a tiny bit. Better to have it too low and die out than too high and take off.

  • @alexjhill408
    @alexjhill408 9 лет назад

    Nice video

    • @49ccscoot
      @49ccscoot  9 лет назад

      Alex Hill Thanks!

    • @alexjhill408
      @alexjhill408 9 лет назад +1

      ***** Ya man, took my bike out of the garage and was looking to improve the idle. Didn't really know how the mixture screw played in to it. But now the low end throttle response is much crisper smoother and quicker.. Also let the bike idle for over 10 minutes with no clearing and it was nice and consistent the whole time.

  • @Kaloyan87
    @Kaloyan87 10 лет назад

    How far should the Idle screw be open, given that its a first start after the carb was off for cleaning? What causes the engine to die out when I touch the throttle? Sorry if it sounds like a silly question, but I'm still at the "start it up, let it warm up, take it for a spin" part.

    • @49ccscoot
      @49ccscoot  10 лет назад

      About 2 turns for a starting point on the mix. Look at the slide in the carb and turn the idle speed screw till it's just barely open. May have to work the throttle a bit to get it started and turn it in more, but that's better than having it take off when you start it. You may have the wrong mix settings or needle setting or perhaps something is still clogged in there. Air box should be installed if not already.

    • @SweatyOnTeaHC
      @SweatyOnTeaHC 9 лет назад

      ***** hey I have a 2 stroke I just bought and and I replaced the air filter and noticed some oil in the card laying in a crevice by where the air filter connects. Also it smokes quite a bit even after it starts and runs for a bit. Stock muffler restricts the power a ton and runs perfect with it just slow when I put the performance muffler on it runs spectacular but after three minutes when giving it gas it feels like it's missing and won't pick up and go then out of nowhere takes off like a a bat out of hell again and then eventually bogs out and stalls.

    • @49ccscoot
      @49ccscoot  9 лет назад

      You probably need to tune the carb for the aftermarket pipe with a larger main jet.
      Could be just low quality oil making it smoke, unless it's a new problem with a scoot you've had for a while.

  • @joaomelo61
    @joaomelo61 4 года назад

    Great Info!! thanks a lot!! what about if you get it good, but on WOT from standing point she bogs and spits??
    I had it ok but the engine was flooding. I took out the carb and cleaned it, and this tarted after i installed it back in. Just cant get it right this time. Any tips on what might be the problem?

    • @49ccscoot
      @49ccscoot  4 года назад +1

      The tune may be different now with it cleaned. Make sure the float height is good and see if needle settings get you better response.

    • @joaomelo61
      @joaomelo61 4 года назад

      @@49ccscoot thanks a lot buddy found the issue, float was slightly bent and starving the carb : ) running great again!

  • @winstonbanks1057
    @winstonbanks1057 5 лет назад +1

    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 ?????

    • @49ccscoot
      @49ccscoot  5 лет назад +1

      I would try a larger or smaller pilot to see what happens. Depending if you have an air or fuel screw.

    • @winstonbanks1057
      @winstonbanks1057 5 лет назад

      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

  • @TheBoera
    @TheBoera 7 лет назад

    hi, thanks for the video. I am busy rebuilding a DINLI JP 502 and bought the exact carb, but are not sure about the hose connections? I only have the fuel hose and a thin hose coming out of the engine. There is however 4 hose connection points on this carb. I understand some is vacuum and should be kept open, just not sure which is which. Have you got a diagram of it. All the manuals of Dinli JP 502 I found on the internet is "shadowed" and I can not make out anything on it. I normally fix mowers and whipper snippers. This is my first quad job...

    • @49ccscoot
      @49ccscoot  7 лет назад

      Connections shown here :
      ruclips.net/video/UipC6DLD-EE/видео.htmlm45s

  • @cabrinhaGR
    @cabrinhaGR 6 лет назад +1

    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
      @49ccscoot  6 лет назад

      Maybe the float height is wrong or the pilot jet is way off.

    • @cabrinhaGR
      @cabrinhaGR 6 лет назад

      @@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.

    • @49ccscoot
      @49ccscoot  6 лет назад

      @@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.

    • @cabrinhaGR
      @cabrinhaGR 6 лет назад

      @@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.).

    • @49ccscoot
      @49ccscoot  6 лет назад

      @@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.

  • @autopediacom
    @autopediacom 7 лет назад

    Hello
    Thank u for ur efforts to explain such a complex topic so practically.
    can u pls guide me on how to get the max pick up on my Yamaha, 2 Stroke RX100 92 model?
    I have put new clutch plates, new piston, rebored the block to 1 step up over stock bore.,new spark plug, new air filter,new connecting rod, and did carb cleaning, also I add semi synth 2T oil (30% ) .
    Also guide me to stop leaking oil pump.
    Does reed valve play any role in pick up of bike?
    pls.

    • @49ccscoot
      @49ccscoot  7 лет назад

      I think there are others that could be of better assistance of you, since I don't have experience with the geared 2T bikes. Any 2T could possibly benefit from port work and getting the compression and squish right. That's takes time to do a lot of measurements and you must know what you're getting into and realize the risk of ruining things. Two-Stroke Performance Tuning by A. G. Bell is a good book to get you going with the knowledge to handle that stuff.
      Oil pumps also aren't my thing. I stop all of mine by removing them and pre-mixing my gas/oil. Sometimes it's as simple as a loose fastener, bad check valve, or a damaged hose though. First thing is to be certain of where the leak originates, which may require some cleanup.
      Reeds do make a difference, though just swapping to CF or fiberglass reeds on my scooters has never been a drastic change. Probably the most difference I've felt from a reed change was moving to a block like the VFORCE-3.

  • @patmatte
    @patmatte 2 года назад

    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?

    • @49ccscoot
      @49ccscoot  2 года назад

      Start with the speed screw. Then adjust mix. If idle raises too much, correct with the speed screw.

  • @49ccscoot
    @49ccscoot  11 лет назад

    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.

  • @gregor.potrebujes
    @gregor.potrebujes 2 года назад

    That's an old video, but still very usefull! I have one question... If I have the mixture screw unscrewed more than half a turn, my engine is idling very high for 10 to 20 seconds and then falls down to a "normal" idle revs. I have to have this screw out no more than half a turn in order for the engine rpm to instantly fall back to idle after I release the throttle. Does anyone know what could be the culprit? I thought that engine must be leaking somewhere but it sealed the exhaust and intake and filled it with 1.5bar of pressure and it holds it weill, so no leak. I also have to mention that I had to put a 1mm washer between the carburetor and an idle enricher in order to be able to start the engine. If this washer wasn't there you have manually crank it for three minutes to start it. I have a minarelli horizontal two stroke 50cc engine (CPI/keeway).

    • @49ccscoot
      @49ccscoot  2 года назад

      Lean running engines will often experience high idle that drops after some amount of time. Usually it's worse if the engine is hot. It will happen when the needle is too lean as well, so you could try moving the clip down a groove on the needle and see how it changes.