You've got a fresh engine with tons of compression, and you're working the tractor like a government mule. That creates excessive heat, and the hot spots old is talking about.
There is no one "right" plug. You need hotter plugs if you just putter around the yard, and cooler plugs if you flog the thing.
In Champion plugs, the higher the number the hotter the plug IIRC. D21 is hottest, D15Y is coolest. Autolite is not as straightforward with their numbering so I don't want to stick my neck out on that one. People don't like Champion plugs anymore though.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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