Mike, like the others said about the socket, 7/8 will do it. But, if the center electrode has square edges the old plugs are most likely fine to use. As long as the plugs aren"t wet from oil soaking or flooding they are ok to use in the tractor engines. Save the money. I have had my f-12 since 1999 and it has the same plugs in it when I bought it and they were old then, it runs like a champ! Spend the money on carb cleaner and a wire brush to clean the plugs. You will need the wire brush down the road, trust me!
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
... [Read Article]
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