Carby Dax Carb

Discussion in '2-Stroke Engines' started by trader, Apr 26, 2007.

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  1. trader

    trader Guest

    I bought a Dax engine kit and had to modify or tinker with almost every part which was kind of challenging but there is one thing I just cannot figure out The engine will not idle at a low rpm. When I come to a complete stop the eng sounds like it's going to explode I hit the kill switch to keep it from over revving.You wouldn't think a NEW engine would have this problem.......
    I've cleaned the carb completely but still no help. Has anyone else had this same problem?

  2. jeffspeeder

    jeffspeeder Guest

    adjust the idle screw to idle a little richer cuz mine idled real fast when it was running lean.

    "MBc EDIT - This post contains information or advice that knows to be incorrect."
  3. azbill

    azbill Active Member

    check and see if it is sucking air where the carb mounts to manifold
    I have an O-ring in my carb to help...coupla cents at ace
  4. Guest

    Guest Guest

    Not the idle screw thing again Jeff! :D

    The screw on the Dax carb is for idle SPEED only. However, you may have a lean condition due to several things, including sucking air from around the intake gasket, or the carb to manifold mount itself.

    Have you turned the idle SPEED screw out?

    Check for air leaks, and loosen the idle SPEED screw.

    Let us know what you find.
  5. jeffspeeder

    jeffspeeder Guest

    opps sorry :grin:

    but if you are running a good idle adjustment and it still is running to high then it is defintely a leak in the manifold gasket or the carb it self i would probley say go to the auto store and get some gastet materiel and some silicone gasket sealer and do that thats what i got it works wonderful.
  6. trader

    trader Guest

    What size O -Ring should I buy? I turned in the side screw the one with the spring on it all the way in and then I backed it out 3 1/2 turns. FYI: I could remove the screw and it wouldn't make a difference all the way in or all the way out No Help!
    All bolts are tight. How can I tell if I have an air leak ? I cannot feel any air leaking by the use of my hands.
  7. JosephGarcia

    JosephGarcia Guest

    On top of the carb is a bell shaped, plug screw thing. When you unscrew it, it has a brass cylinder attached to it. Now, on top of the bell shaped screw is a small 1 inch long screw with a single nut on it. This is a barrel adjuster for the throttle CABLE, Slighty unscrew the small nut that is screwed down towards the bell shaped plug dealie, and the screw the barrel itself slightly down into the card for a slower idle speed, tighten the small nut to keep it locked, and test your engine. lower even more for lower speed.

    What this does exactly is set the lowest amount that the brass slide can lower down into the carb, set the barrel too high, and the slide will stop short of the idle adjustment screw and let it too much fuel which equals a fast idle. You want to have it set so the barrel can move pretty well down the tube, and hit the idle screw, from that point you can make fine adjustments with it. This is the reason your idle adjustment screw is doing nothing.

    If you need pics to help explain, let me know.

    This is most effective way to fix idle speed! (from my own experience at least)
  8. trader

    trader Guest

    No pictures needed . thank you though........that's one of the first things I did was bottom that barrel out which in turn would lower the slide and restrict fuel flow. But that wasn't the fix. Do you have a DAX kit . man those things are built cheap.
  9. JosephGarcia

    JosephGarcia Guest

    I have a Kingsmotorbikes kit.

    Well if the barrel adjustment doesn't help, I would search for air leaks.
  10. thatsdax

    thatsdax Guest


    IT may be that your carb slide is sticking up high. When this happens? Do you have slack in your throttle cable? Check it..IT may be that your slide is sticking. If this happens, Take some Emry Cloth and polish the area of the carb slide that is causing it to stick or bind....Lube with some WD-40 and replace...Enjoy the ride..
  11. gone_fishin

    gone_fishin Guest

    agreed. also, if you overtighten the carb "cap" it'll warp the barrel just enuff to hang the slide up top.
  12. Guest

    Guest Guest

    Dax kits are CHEAP? You mean "inexpensive"....but yeah, cheap too. that's why they are affordable. If it was built in the U.S.A, it would cost 5-600 dollars!

    They are from China, you know. I had to tweak EVERY LAST ASPECT of mine. The slide was so tight, I had to use a screw driver to pry it out, and it took a good half hour of sanding before it worked.

    But that's half the fun. I know the whole engine intimately now and have had my hands on almost every last part, inside and out. (not the crank though)

    Plus, you could spend 4-500 dollars for one that worked O.K. right out of the box.

    I liked mine so much, I got another on the way!
  13. rcjunkie

    rcjunkie Guest

    These engines require some basic mechanical knowledge and those who don't have it shouldn't blame the kit for their problems. There will be needed adjustments of various aspects of the install throughout the ownership experience. You can't set it and forget it with these engines, they are not high tech.

    If your background experience in maintenance is limited to filling up the gas tank then you should consider an electric motor.

    I personally enjoy tweaking my motor bikes. I enjoy looking things over and making adjustments as necessary whether it be engine mount bolts/nuts, headbolts that need retightening, carb that needs an idle speed (mixture screw to some :) ) adjustment, or fiddling with the choke setting to get the perfect instant start on first start of the day.

    I don't have an issue with newbie questions but I do take exception when they seek to find external explanations (faults) for their general lack of knowledge.
  14. trader

    trader Guest

    FYI: Who are you to question my knowledge base and further more I 'm entitled to my opinion. I think the DAX kits are cheaply made PERIOD.
    RCJUNKIE ........You can go pound sand for that comment!!!!!!!!!
    I realize adjustments are needed however, when your changing gaskets on a brand new engine something's wrong. If DAX's knows this ia a problem why not correct the problem and use better gaskets or perhaps instruct the customer /consumer to replace and or inspect gaskets prior to use. There are many people who have had this same issue please see the other postings provided on this site. This is supposed to be a friendly site where people offer advise and share ideas. Perhaps I should of stated that "DAX Kits need improving" nevertheless you shouldn't of slammed me and assumed I have limited technical ability.
    Last edited by a moderator: Dec 15, 2015
  15. JosephGarcia

    JosephGarcia Guest

    No one on this forum is purposely out to make fun of another member who simply asked a question.

    Do you have the standard metal intake manifold or chrome? There is a thread on this forum somewhere that says the chrome one has a significant air leak, and how to fix it.
  16. 1cc

    1cc Guest

    Engine quality

    I totally agree with Trader, All these kits come from the same factory in china. No matter where you buy your kit they are the same, only differance being stickers or paint. As for quality they are all crappy, they all use sub standard paper gaskets that dissolve when exposed to the elements. I would bet that there is no one here who hasnt replaced at least one of the chinese gaskets.
    How do we know the quality is crap, just compare a japanese casting to a chinese one & it is obvious.
    What should happen with all these dealers is that they should get onto China gas
    & tell them that the gaskets are sub standard & that they will no longer accept engines if the quality doesnt improve. This has been an on going problem for years, it is up to the dealers to stipulate quality issues with the manufaturer. The chinese probably produce these engines for less than $20 as can be seen in the quality or 2 bowls of rice which ever comes first.
  17. Guest

    Guest Guest

    I haven't had to change my gaskets...yet. I did a major quality control check on all parts as I assembled it though.

    50 miles and so far, so good.
  18. Guest

    Guest Guest

    I would like to add that I knew these kits were cheap Chinese products, and I would have to tweak all the parts so they would work nicely. This aint the first time I've met up with Chinese cheapo stuf don't ya' know.

    For me at least, part of the fun of these kits is the tweaking. They are definitely not for the "set it and forget it" crowd.

    I bought a drill press a couple years back that came in a box, with a chuck and some other things I still haven't identified. It was 9.99 U.S.

    I had to use my imagination to get a chuck with a keyway and no hole in the center onto a shaft that was smooth and had a hole tapped for the included allen bolt.

    I baked the chuck for a half hour at 325 and coated the shaft with some Loctite sleeve retainer. I took the baked chuck and tapped it onto the shaft with a leather mallet. O.K., I beat on it until my arm hurt, but I got the chuck way up on the shaft. I came out the next morning and tried the drill press. It worked fine and has ever since.

    The moral to the story is I paid 10 bucks (cheap) for a 1940's tech drill press, Made In China, that had no instructions except for a bunch of crazy jibberish, and parts that didn't match up. I had to think about it for awhile, and through imagination and determination, I made it work.

    Kinda like these kits.
  19. Sounds like some of your gentlemen would be well advised to simmer down
    a little bit. This is supposed to be FUN, ya'll.

    No need to get your panties in a twist!

    After all, we're here discussing little gas engines that attatch to a bicycle.
    This is not exactly super serious material, ya know?


    For what it's worth, I would say that yes, these kits are cheap.
    But you kind of have to expect that. As another poster said,
    they are made in china, and they are very inexpensive.

    Now, I don't know where ya'll are from, but in my neck of the woods,
    thats a known formula for something being cheap crap!

    They're still fun though, make no mistake. They just take a little
    bit of "re-engineering"... :)
  20. azbill

    azbill Active Member

    IMHO the tinkering is the best part :D
    if it was easy, it wouldn't be as much fun for me
    but, I always take stuff, alter it, and make it better (at least In my mind) :lol: :lol: