I was thinking of a good way to fix the carburetor troubles and decided to pull the plugs to see how they look. I started with the number 1 cylinder and the end of the plug was black. This indicates either the engine is running rich or the plug is too cold.
I pulled each of the other spark plugs and noticed the #1, #4, and #7 plugs are the worst. These are all fed by the same side of the carburetor. Since I’ve done more idling than driving lately (to test the coil), this is likely related to the idle mixture screws.
These screws should be set the same distance out on each side and should be set to generate the highest vacuum. Unfortunately, my vacuum does not change when I turn the mixture screws. However, the screws are set the same distance out so you would expect the same plug appearance on both sides.
I checked the screws again and they are about the same distance out. The passenger side, which feeds the plugs in question, was possibly a little further out. I turned it in by 1/3 turn just to get closer to the right spot until I can fix the carburetor tune.
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