carburator tuning

Discussion in 'Introduce Yourself' started by hcrft, Feb 11, 2013.

  1. hcrft

    hcrft New Member

    Joined:
    Jan 4, 2013
    Messages:
    28
    Likes Received:
    0
    im looking for advice and help on fuel setting for my bike. i have a CNS carb installed and running, and want to know how to get optimum performance out of it.
     
  2. biknut

    biknut Active Member

    Joined:
    Sep 28, 2010
    Messages:
    6,365
    Likes Received:
    3
    CNS carbs are hard to tune. They were designed to meet epa requirments, more than actually make your motor run well. The eaisest way to get optimum performance is to toss it in the can, and replace it with an NT of a Speed carb. Be sure and buy a new throttle cable for a NT at the same time. The throttle cable for a CNS is different. The cable for a NT, or Speed carb is the same.
     
  3. wan37

    wan37 New Member

    Joined:
    May 29, 2011
    Messages:
    343
    Likes Received:
    0
    Interesting biknut,cables are different.I would like to know the difference?Please tell me that could really help me!
     
  4. biknut

    biknut Active Member

    Joined:
    Sep 28, 2010
    Messages:
    6,365
    Likes Received:
    3
    The CNS cables have longer distance from the housing end, to the end of the cable.

    If you're capable of cutting the cable and soldering on a new end you could use the old cable. You would need to cut off about 1/2"- 1" of cable.
     
  5. wan37

    wan37 New Member

    Joined:
    May 29, 2011
    Messages:
    343
    Likes Received:
    0
    I also have got a throttle cable with a bigger end that goes in the throttle housing.why is that?
     
    #5 wan37, Feb 11, 2013
    Last edited: Feb 11, 2013
  6. Kioshk

    Kioshk Active Member

    Joined:
    Oct 21, 2012
    Messages:
    1,153
    Likes Received:
    5
    Yes, toss the CNS and get an NT (less than $20 delivered on eBay). However, I can say that the v3 CNS throttle cable DOES indeed fit the NT Speed carb; I switched mine out no probs.
     
  7. survive1990

    survive1990 New Member

    Joined:
    May 14, 2013
    Messages:
    29
    Likes Received:
    0
    whats the difference between the speed and the nt ?? i have a cns and i hate it!! i cant adjust the needle its runing rich which should i get.. im thinking the nt??:-||
     
  8. Scott.D.Lang

    Scott.D.Lang Member

    Joined:
    Jan 1, 2013
    Messages:
    406
    Likes Received:
    0
    my vote is go to Dax's site and order the RT carb and cable from him
     
  9. biknut

    biknut Active Member

    Joined:
    Sep 28, 2010
    Messages:
    6,365
    Likes Received:
    3
    Your bike will run great with either an NT or a Speed carb. Both carbs use the same jets and throttle cable.

    A speed carb is about 2mm bigger than a NT. I suspect an NT gives a little better gas milage. A speed carb seems to have a better idle. That's mainly why I like it. Power wise there's not much difference between the two, at least with pretty stock motors.

    A speed carb has a built in petcock which some people have had trouble with. I never use the one on my carb, and just keep an eye on the banjo bolt to make sure it's always tight.

    I also like to use a shorty intake manifold with these carbs, because of the oring, but it's not really necessary.
     
  10. survive1990

    survive1990 New Member

    Joined:
    May 14, 2013
    Messages:
    29
    Likes Received:
    0
    thank you guys i just ordered a nt carb i have a angled manifold im not shure if the carb and the shorty would fit inside the frame it would be really close...
     
  11. survive1990

    survive1990 New Member

    Joined:
    May 14, 2013
    Messages:
    29
    Likes Received:
    0
    one other thing im not clear on.. will the cable from my cns fit the nt carb??
     
    #11 survive1990, May 22, 2013
    Last edited: May 22, 2013
  12. Huffydavidson

    Huffydavidson STREETRACER/MANUFACTURER

    Joined:
    Jan 29, 2012
    Messages:
    1,075
    Likes Received:
    0
    Rt,rt,rt,rt,rt,rt,runs terrific
     
  13. biknut

    biknut Active Member

    Joined:
    Sep 28, 2010
    Messages:
    6,365
    Likes Received:
    3
    No it won't work unless you know how to shorten it.
     

Share This Page