want to tune cns need advice

Discussion in 'General Questions' started by noble b, May 22, 2012.

  1. noble b

    noble b Member

    i was wanting to mess with my cns carb no real problems just want a little more speed and try to make the start a little smother. the number on the carb is C-32CNS66-EPA. don't know much about what im doing and don't want to mess anything up. i was looking for some pointers and maybe some pics of what im looking on the inside.
     

  2. Sgt. Howard

    Sgt. Howard Member

    What engine is it on?
     
  3. noble b

    noble b Member

    Sorry ill try to get a picture of the setup on here when I get home. Its a shwinn beach cruser bolted to the frame in the front.
     
  4. Al.Fisherman

    Al.Fisherman Active Member

    POINTER #1...Get rid of the CNS carburetor..
    [​IMG]
     
  5. noble b

    noble b Member

    sorry read that wrong sgt. its a 66cc grubee. i have the newest carb it has a cone blue filter not the black or red plastic. here is a pic of the engine and bike.
     

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  6. Sgt. Howard

    Sgt. Howard Member

    THAT carb I am not familiar with- I imagen doing a plug chop to determine mix would be the first order of buisness. From there, adjust as needed and I am sure there's more that the fellows here can guide you on.
    Al, I will dissagree with you (first time to my knowledge) on the CNS- It CAN be made to work wonderfully, but not everyone can do it. I've got four of them in perfect running order and if dealers continue to discount them because of their... perculiarities... so much the better as far as I am concerned. Once cured of their chronic air-leak issues and mounted properly, they make a wonderful, reliable and powerful little unit. I've got one bike that can do hills without pedaling!!! That's with MY 200lb frame on it!!! Standard China Trollop 44 tooth sprocket! There's another thread where I describe what I do to make them work :army:
     
  7. noble b

    noble b Member

    sorry again sgt. im new at this what is a plug chop. and after i ask that question not sure if i can do it.
     
  8. Sgt. Howard

    Sgt. Howard Member

    Others please check that I have this right

    I will explain it as best as I understand it- I have only learned it myself last year.
    Get a brand-new sparkplug. Run the engine to get it up to temperature. Swap the brand-new plug into the engine. Run said plug for about ten minutes. Kill the engine without relenting on the throttle. Pull the plug and note the color of the white portion- if it is white, you are too lean... dark brown, you are too rich... tawny blond is the color of choice. NOW- once you have determined what mixture of air/fuel you have, and what changes might be in order, open the main cylinder of the carburator and remove the air piston. You will note a brass rod hanging down from it. Remove the throttle cable from the air piston and note the clip that holds the rod in place. Allowing the rod to extend further down will lean out the mixture, drawing it back in will rich the mixture... I forget the exact nature of the adjustment, ie what holds the clip in place with the piston, but there arecut rings in the rod for the clip. Move the clip up drops the rod and leans out the mix, move the clip down will pull the rod up and rich the mix... zb, if you pull a plug chop and find a dark plug, move the clip up a notch or two and re-assemble the thing. Then do another plug chop and see if you have it right.
     
  9. noble b

    noble b Member

    ive been looking on ebay for 30 min and cant find the nt high performance carb. not saying im going to go this route just yet but yall have a place i can find it for cheap.
     
  10. noble b

    noble b Member

    ok take that back i found a cns nt high performance carb on gasbike.net and was looking for that on ebay. but i thought that cns and nt where two different types of carbs. also if i do end up going this route then witch one do yall suggest red or black and does it really matter if the choke is on the handle bars. my carb has that but the nts on ebay don't look like they do.
     
  11. Al.Fisherman

    Al.Fisherman Active Member

    On a CNS, both the throttle and choke cables run from the handlebar to the carburetor, on a NT the throttle cable goes to the carburetor, and the choke is controlled with a lever on the carburetor.
    CNS...[​IMG] NT on left and a NT speed on the right [​IMG]

    Personally I run all NT's on my builds, although I have a NT speed that I have as a spare should I need it. I bought it along with 3 boxes of parts. Had a CNS, and sold it as soon as I could.
     
  12. Sgt. Howard

    Sgt. Howard Member

    If what you have is the CNS and it's on a 66 cc... does it have a nylon sleeve between itself and the intake?
     
  13. noble b

    noble b Member

    theyre pritty cheap i think im going to get one just to try it out. found them for like 12 15 bucks still going to keep the cns and see if i can learn what im doing. if yall are still checking this is there a better chain tensioner cause the one that i have moves toward the wheel and is a pain in the ***.
     
  14. noble b

    noble b Member

    yes sgt.
     
  15. Sgt. Howard

    Sgt. Howard Member

    I was afraid of that- There is a way to make that carb sing with power, but it will take effort. Do you have a metal working lathe?
     
  16. noble b

    noble b Member

    no and know nothing about that kind of stuff
     
  17. Sgt. Howard

    Sgt. Howard Member

    Let me describe your symtoms- no reasonable idle, can only function throttle wide open, am I right? Low end kind dicey? PM me, I'll talk you through it. The prejudice against this carb is well founded, but the cure is sure. :army:
     
  18. noble b

    noble b Member

    ok sgt. heres a pic of the carb i took it off so i can make sure that im getting the gasket right the little white ring on the 2nd pic. also i put one of the whole set up not that it maters.
     

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  19. noble b

    noble b Member

    forgot to add the left side
     

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  20. Sgt. Howard

    Sgt. Howard Member

    Those two hoses... the clear ones... pull one off completly, and hook the other to that tit. You have a later version of the same carb, but the bushing (I guess that's what I'll call it) will fit just the same- in the right hand shots, the carb is dismounted off the intake, right? No problem... I will be sending the bushing tomorrow as soon as I figure the cheapest form to mail it by
     
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