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Carb problem please help!

Discussion in 'CVP Stage 1 Tuners Kit' started by cru11, Apr 18, 2013.

  1. cru11

    cru11 New Member

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    I just installed my cvp deluxe tuners kit and cvp rebuild kit along with an xlflow-s1 intake on my 2003 xl883h i used a 44 idle and 175 main and it has a serious carb cough even 3-4 turns out! i also noticed it will NOT start without the choke when its warmed up??? do i need a larger idle jet?

    thank you for the help
    Last edited: Apr 18, 2013
    cru11, Apr 18, 2013
    #1
  3. cru11

    cru11 New Member

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    i would also like to ad the intake setup was from figure machine and im running screaming eagle exhaust
    Last edited: Apr 18, 2013
    cru11, Apr 18, 2013
    #2
  4. kenfuzed

    kenfuzed Administrator Staff Member

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    This really sounds like an vacuum leak either around the manifold boot, flanges, or even a leaking vacuum hose.
    kenfuzed, Apr 18, 2013
    #3
  5. cru11

    cru11 New Member

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    Thank you for the help im going to do a propane test on it to check for leaks first thing tomorrow also do you think im running the right size idle jet for the setup i have?
    cru11, Apr 18, 2013
    #4
  6. hotroadking

    hotroadking Super Moderator Staff Member

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    Get the leaks fixed then worry about the jets, once that is corrected you can start with checking the idle air mix screw to determine the pilot jet,
    hotroadking, Apr 18, 2013
    #5
  7. cru11

    cru11 New Member

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    A buddy is telling me the setup i have will require a 46, 47 or 48 idle jet (im running a 44) besides the fact of any leaks does a 44 idle seem too small?
    cru11, Apr 18, 2013
    #6
  8. kenfuzed

    kenfuzed Administrator Staff Member

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    The CVP kit you are using (supported here) is already designed to work optimally with the suggested jets. Going larger in the jetting would only be required if compensating for vacuum leaks, which is counterproductive. Solve for the other problems which are not jetting related and you will find the jetting perfect.

    Here are additional things to check if a vacuum leak is not detected.
    http://www.cv-performance.com/harley-cv-carburetor-tuning-issues/
    kenfuzed, Apr 19, 2013
    #7
  9. hotroadking

    hotroadking Super Moderator Staff Member

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    It's really counterproductive in tuning to work on a bike with a glitch
    don't tune or mess with the carb until the setup is right as far as operation no
    vac leaks then work on one circuit at a time pilot, then needle, Main should be good
    unless you really open up the engine...
    hotroadking, Apr 19, 2013
    #8
  10. cru11

    cru11 New Member

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    can get new vac line material local? like at the hardware store and then cut it myself?
    cru11, Apr 19, 2013
    #9
  11. kenfuzed

    kenfuzed Administrator Staff Member

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    Any auto parts store will have vacuum hose line. I believe it is 1/8 or something small like that.
    kenfuzed, Apr 20, 2013
    #10
  12. cru11

    cru11 New Member

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    okay replaced all vac lines and i replaced manifold gasket and no coughs but now when i get over 60mph at any throttle position it loses power and stalls out and dies but lights stay on?
    cru11, Apr 20, 2013
    #11
  13. hotroadking

    hotroadking Super Moderator Staff Member

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    Is the petcock on normal or reserve.
    hotroadking, Apr 20, 2013
    #12
  14. cru11

    cru11 New Member

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    It was on reserve is that not good?
    cru11, Apr 20, 2013
    #13
  15. cru11

    cru11 New Member

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    i cleaned out the petcock today and ran it up to 60mph on reserve and it still died?
    cru11, Apr 21, 2013
    #14
  16. kenfuzed

    kenfuzed Administrator Staff Member

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    IMO I wouldn't be running on the reserve until fuel is almost empty. The venting may be suspect here. If the vent inside the gas cap is faulty it will slow the flow of fuel to the bowl and eventually the carb starves for fuel and stalls during hard acceleration.
    kenfuzed, Apr 21, 2013
    #15

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