Trouble with CNS Carburetor. Need help!

Discussion in '2-Stroke Engines' started by Top Cheese, Aug 9, 2009.

  1. Top Cheese

    Top Cheese New Member

    I have been tinkering with my new CNS Carburetor that I bought from spookytooth for a few days now. And I haven't been able to find out what the problem is. It's starts fine and idles fine but it seems like it just dies down at random times, I do not know what is causing it. Some times I am going 15 and it dies down, and some times I'm going 25 and it dies down. There are bubbles in the pink tube and I don't know if that is affecting anything or not. So if anybody has some tips for me they would be greatly appreciated. I'm trying to get it back on the road as soon as possible so the quicker the reply the better. Thanks :helmet:
     

  2. biketec

    biketec Member

    The problem is that you have the pink hose still attached to it you need to remove it from the top of the carb and let it hang from the bottom They come from china like that for some reason disconnect and you will be on your way!!!
     
  3. Top Cheese

    Top Cheese New Member

    Won't gas leak out of it like crazy? And since I have been riding it like this for a while will that have any damage on my engine or the carburetor? Thanks
     
  4. biketec

    biketec Member

    Nope just disconnect it drain whats in there it was acting like a vacuum pulling it from the drain trust me on this one! Ride that thing my friend RIDE:helmet:
     
  5. Top Cheese

    Top Cheese New Member

    Ok I will thanks! And what is the deal with that little choke lever? When and how should I use that?
     
  6. biketec

    biketec Member

    OR better yet cut it in half!
     
  7. biketec

    biketec Member

    I put mine on the bars and I peddle, pop clutch, push choke it, fires and I move it back to off but that's my bike at my altitude
     
  8. biketec

    biketec Member

    here are some pix for ya!
     

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    Last edited: Aug 9, 2009
  9. Top Cheese

    Top Cheese New Member

    If anybody has more pics of this set up I would like to see what you did with the spare tube. Thanks.
     
  10. Top Cheese

    Top Cheese New Member

    Does anybody have pictures of there carb the could post?
     
  11. sunsetboy

    sunsetboy Member

    CNS carb choke and tube

    I pulled the choke completely because I don't need it here in sunny CA and the tube points downward from the bottom port but I am getting a lot of discharge on my bike and it's getting quite messy. I'll post a pic tomorrow. I've run this now for 3 months and lost the filter on the first week. Dang urban streets!
     
  12. JTinFL

    JTinFL Member

    I,ve been using the CNS carb for a month on a 48cc.The pink tube was crimping and causing an intermittant power loss.Replaced with a piece of 1/8 ID clear plastic tubing from hardware store.I do see fuel going from bottom to top whith engine running.Someone said that it was a float problem if any fuel came from bottom at all.Yes i still have the top and bottom connected together.I put a piece of plastic tubing on each of the other 2 ports coming out of top and routed them down the seat post down to the rear where kickstand is mounted.Just to keep junk out of carb if nothing else.After getting air/fuel mixture scew adjusted then idle screw.The bike runs like a champ.Has great low end,can take off with no peddling and when you open it up it gets a low throaty sound and cranks up to 30 mph.This carb has been a mystery since it came out and I only know what's working on this bike.Yours may be differant setup.
     
  13. sunsetboy

    sunsetboy Member

    Thanks for the idea. I'm doing an overhaul of my motor anyway so it's about time to go through the carb. I'm still working on the fine tuning bit of the carb because I may be experiencing sn exhaust leak but I'll find out more when I tear the carb apart.
     
  14. motorpsycho

    motorpsycho Active Member

    yep, that tube is a vent /overflow.
    with it connected at both ends, it is building a vacuum in the carb.
    It needs to be vented to keep the fuel moving. just like a vented gas cap, the fuel needs to "breathe".
    if it can't breathe, a vacuum will develop and the fuel will not want to flow like it should.
    think of pouring a liquid out of a can that only has one small hole in the top. it gurgles and doesn't want to come out very well. pop a second hole in the lid of the can and the liquid will flow out of the first hole much faster.
     
    Last edited: Mar 27, 2010
  15. motorpsycho

    motorpsycho Active Member

    what does an exhaust leak have to do with the carb.?
     
  16. motorpsycho

    motorpsycho Active Member

    you're kidding about that right?
    move the choke lever to "on" for starting in cold /cool weather.
    move the choke lever to "off", when starting in warm/ hot weather.
    the choke partially blocks the air intake side of the carb, when it is in the "on" position so the engine gets more fuel than air at start up, which makes for much easier starting in cold /cool weather.
    if you try to run the motor with the choke on, it either won't run, or it will run very badly.
     
  17. Top Cheese

    Top Cheese New Member

    It's hanging. And a bunch of gas is coming out the end of the tube.. What now?
     
  18. motorpsycho

    motorpsycho Active Member

    tap the side of the float bowl with a plastic handle screw driver.
    the float may be stuck.
    if that doesn't work, you may have to take the float bowl off and re-adjust your float level.
    no gas should be coming out of that tube at all.
    gas coming out means that either your float is stuck down which is letting the needle and seat stay open when the float bowl is full, or your float level is adjusted so that the float never rises enough to close the needle & seat.
    OR...you have a bad float and it is getting gas in it, which will make it too heavy.
     
  19. sunsetboy

    sunsetboy Member

    Thanks motorpsycho! I tapped it real good and something happened because my carb works as advertised. I also needed a new intake gasket because the last one burned up.
     
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