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Erractic hesitation popping through carb

Discussion in 'CVP Stage 1 Tuners Kit' started by chucksr1, Apr 13, 2013.

  1. chucksr1

    chucksr1 New Member

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    Hi Ken,
    i read a similar thread you had with a guy named brian, I have a 2006 xl1200c a true 1200 not a 883 convert I bought the bike last year and put 4000mi on it last season, it ran well except for a slight popping on warm up once it was warm it ran fine. so wanting to get rid of this condition entirely i when stage 1 arlen ness big sucker aircleaner, cvp premium rebuild kit of which i used the jet sizing chart provided and installed 46 idle and 185main and lastly cycle shack ss130 slip on mufflers.

    Here's the problem from a stop you have to really play the clutch because of popping/backfireing, after you get up to speed /cuising 40-45 mph you get the pop/hesitation this condition now exists cold or hot. at an idle blipping the throttle the engine seems to respond well. mixture screw is set at 2 1/8-2 1/4 while out riding i have tried to fine tune it but it didn't help, any suggestions before i put it back to stock? oh btw i should mention i did do the vacuum leak check as described on the cvp site no leaks detected.

    thanks Chuck
    chucksr1, Apr 13, 2013
    #1
  3. Ripper01

    Ripper01 Member

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    Did you clean the carb and blow out all the passages with air before you installed the kit?
    Ripper01, Apr 14, 2013
    #2
  4. kenfuzed

    kenfuzed Administrator Staff Member

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    Hi Chuck, this still sounds like a vacuum leak which can be causes when mounting a new air cleaner assembly, which can sometimes pull the carburetor away from the manifold boot.

    Other things that will cause the described include:
    1. upside down needle jet (see #2 at link below)
    2. exhaust leak at the head pipes, exhaust flange crushed by over tightening or shifting when the mufflers were replaced.
    3. debris in the passages.
    4. binding slide or pinched slide diaphragm.
    Harley CV Carburetor - Tuning Issues and Troubleshooting
    kenfuzed, Apr 14, 2013
    #3
  5. chucksr1

    chucksr1 New Member

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    hey Ken,
    I will check all your suggested tips and get back to you, i was thinking the new air cleaner suspect as well, will let you know what I find.

    thanks, Chuck
    chucksr1, Apr 14, 2013
    #4
  6. chucksr1

    chucksr1 New Member

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    hey ripper
    yes carb was throughly clean with carb cleaner and compressed air.

    thanks chuck
    chucksr1, Apr 14, 2013
    #5

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