Carb Help Please!

Discussion in 'Engine, Fuel and Exhaust' started by The_Aux, May 21, 2014.

  1. The_Aux

    The_Aux New Member

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    Hey folks so I will get right to it. I have a 1990 heritage (sons bike ) on it is a cv keihin and I have taken this thing apart twice now first time was cause I had to replace petcock and when I turned new one on gas cam pouring out of carb figured float problem. Checked float height and was out of specs so I adjusted and put back on problem solved. However I now have a hesitation when I throttle up and it is in the first 1/4 of the throttle. I have checked the accelerator pump we are good there getting a nice healthy squirt my f/a mixture I believe to be fine as she idles perfectly. I cleaned this carb out like you wouldn't believe used good ole b-12. Any suggestions would be greatly appreciated as my son is dying to get out and ride and this is his first bike so I want to make sure everything is as good as it can be since he is a brand new rider! Thanks brothers and sisters
    Aux
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    Welcome to The forum, check the spigot and intake seals, also check the needle and seat
     
  3. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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    And make sure that the vacuum port on the vacuum piston has NOT been drilled out to 1/8" (or worse - larger). If you can insert the "chuck" end of a 1/8" drill bit into the vacuum port, then I am afraid someone has been at that vacuum piston. This can cause the kind of symptoms you are describing. Only cure is to replace the vacuum piston.

    Also check the VOES. Replace the hose from the VOES to the nipple on the intake (just behind the carb).

    Cheers,

    TQ
     
    Last edited: May 21, 2014
  4. The_Aux

    The_Aux New Member

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    Thanks guys I will definitely check these areas !
     
  5. Bodeen

    Bodeen Well-Known Member Staff Member Moderator Contributor

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    Also make sure the squirt from the fuel pump is squirting straight down the middle of the throat.
     
  6. BUBBIE

    BUBBIE Well-Known Member

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    Did you have the Diaphragm out?

    Might have gotten Pinched during RE-assembly... EASY Out but TOUGH to get back IN correctly...:(

    signed....BUBBIE