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Running rich or not couriosity

Discussion in '"Stock" Alpine' started by Acollin, Sep 8, 2020.

  1. Acollin

    Acollin Donation Time

    My sense/belief is that the car must be running rich if the plugs are blackened. True?
    Can other conditions produce a carboned up plug?
    If not, mixture must be leaned — although that leaves the unexplained addition of the helpful choking. The choke is pulled out very little in order to get that normal running feel.

    i believe I need to take the beam out for a longer ride— operating temperature for more than an hour and check the plugs. This should reveal something I would think. Not such a bad way to spend an hour!!!
  2. RootesRacer

    RootesRacer Donation Time

    Last edited: Sep 10, 2020
  3. RootesRacer

    RootesRacer Donation Time

    Generally yes, there are not a lot of issues that cause black plugs except richness.

    When you pulled the choke out, are you sure it wasnt the "choke" throttle stop that was opening the the throttles as opposed to enriching the mixture?
  4. belmateo

    belmateo Gold Level Sponsor

    Dumb question, have your synched the two carbs to make sure they are flowing the same amount?
    I use two of these (stock photo) UNI-SYN.jpg
  5. Alpine 1789

    Alpine 1789 SAOCA President Platinum Level Sponsor

    Hi Andrew. I am watching the news from Oregon and it isn't pretty. Are you still safe?
  6. Acollin

    Acollin Donation Time

    We are safe , but still under the L 1 evac alert. The fires seem to be moving away from my location and our situation seems to have stabilized.
    Our personal greatest concern, at this time, is air quality. It is very bad. We remain at home, stuff still marshaled by the door, but our stress level is lower for now. We need rain to flush the atmosphere and dampen the fires. Rain is in our forecast for later in the week.
    We have been fortunate— many have been very unlucky.
    Thanks for the concern
    Alpine 1789 likes this.
  7. Gordon Holsinger

    Gordon Holsinger Diamond Level Sponsor

    Check the carb diaphrams for cracks in the rubber. If there is a crack or tear in either one you will run lean and when you pull out the choke the mixture is enriched.
  8. RootesRooter

    RootesRooter Platinum Level Sponsor

    If a diaphram is holed, it will idle fine but run low on power - regardless of choke applied.

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