Carb issues

Discussion in 'The Venerable Q-Jet' started by Bigmarc650, Sep 18, 2014.

  1. Bigmarc650

    Bigmarc650 Well-Known Member

    The Century's battery went bad about a month or two ago so being that I have other means of transportation (I bought a harley) I let her sit. I finally get around to getting a new battery for her. Put the new thing in and crank, crank, crank... All crank and no turn. So I figure hey she's been sitting for a while maybe she needs some motivation, and I go and pull the air cleaner off to wet the throttle a little bit and I found that the carb is acting a little funny. Now me being the novice mechanic I am I know there's something wrong with the thing but can't figure it out for the life of me. I can tell you that it's a stock (rebuilt of course) 2 jet Rochester carb and it feels like something's worn with the mechanics of it like a spring isn't doing it's job. Can some one walk me through how to troubleshoot this issue? thanks in advance folks!
     
  2. Bigmarc650

    Bigmarc650 Well-Known Member

    It feels like the springs are working but the fin isn't opening.
     
  3. carmantx

    carmantx Never Surrender

    I think you are referring to the choke flap on the top of the carb?
    That is closed, or near closed when the engine is cold. It should open fully when engine is warm. It that isn't working, you need to open it up and secure it open so the engine will run correctly when warm.
     
  4. Bigmarc650

    Bigmarc650 Well-Known Member

    Ok when I engage the accelerator it doesn't seem to open the choke flap. And for some reason I don't think fuel is getting into the thing, when I spray starter fluid into the carb it gets some life but then dies right away.
     
  5. carmantx

    carmantx Never Surrender

    Ok, good information.

    The choke (top) flap doesn't move with throttle movement, it is completely seperate, and moves from the engine heat and choke coil.

    If it isn't getting gas in to the engine, you want to check the fuel pump, and make sure it is pumping fuel in to the carb. Disconnect the fuel line to the carb, place the end in a cup or milk carton and crank the engine. Fuel should be spraying in to the container. If it is not, then replace your fuel pump.

    If the fuel pump is pumping, then you probably need a good quality rebuild on the carburetor. Float, Needle/seat, accelerator pump are probably old and not doing what they should be doing.

    Let me know if I can help.
     

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