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Technical One more Rochester 2jet question

Discussion in 'The Hokey Ass Message Board' started by Hotrodjohn71, Aug 18, 2021.

  1. Hotrodjohn71
    Joined: Feb 25, 2018
    Posts: 74


    One more Rochester 2jet (or 2gc) carburetor question.
    Regarding the fast idle cam. There appears to be four steps. Can you help me identify what each step does or moreover which are supposed to be utilized so I set my carburetor choke up correctly. Thank you.

    Attached Files:

    Last edited: Aug 18, 2021
  2. jaracer
    Joined: Oct 4, 2008
    Posts: 1,478


    With the choke plate fully closed, the idle screw should rest on the step you have number #1. That gives you fast idle on start up. As the choke begins to open the cam drops until you have normal warm idle. You do have to open the throttle slightly to get it to drop.
    Deuces and Hotrodjohn71 like this.
  3. jimmy six
    Joined: Mar 21, 2006
    Posts: 11,007

    jimmy six

    Here in SoCal I turn the choke to rest on #3 with a full pump cold on start up. After running a minute or 2 I’ll back out of the garage. The slightly higher idle helps. By the time I’m out my housing tract I’m good to go. In the first mile or 2 I may get a stumble needing additional squirt and I’m ok with that.
    Deuces, Hotrodjohn71 and joel like this.
  4. Check around pages 12 and 13 at the link below and see if this helps you get things back together the right way. It may not look exactly like your carb but it should still give you a pretty good idea how it all works together. Jet.pdf
    Hotrodjohn71 likes this.

  5. Hotrodjohn71
    Joined: Feb 25, 2018
    Posts: 74


    Thank you fellas. I greatly appreciate it.

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