Subject: Re: Suitable Spark Plugs for 16/80?

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Editing thi spost because I understan what Bill is saying now. My understanding is that the 5 is hotter and the 7 is colder. I would have thought that a colder plug would be more prone to sooting. However I am here to learn so am I right in thinking your suggestion is to use a slightly hotter plug?

Thanks Rich...