Generally it's because of the siamese ports that exist in the head and the way
the fuel gets to the different ports in the head. If they are consistent like
you describe then you are ok. If the front two were different from the back
two, that would be a bit of an issue.
JNOLEE@aol.com wrote:
> I looked at the spark plugs the other day and noticed that the two center
> ones were very black while the end ones were closer to tan. I don't
> understand how that could be a carb mixture problem. Is it possible that an
> air leak at the intake gasket could produce such uniform results at the
> extreme ends?
>
> Ann and John Lee
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