If you're parading/puttering with the tractor, you want a hotter plug.
If you're working it on a mower, you want a cooler plug.
D18Y is about the middle of the road. A good place to start.
The nice thing is spark plugs are cheap and you can experiment. If you find that the plugs are fouling with the D18's, you can go up to D21's. If you find the tractor seems to run a little hot, drop back to D15's or D16's.
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Today's Featured Article - On the Road with Dave Gohl: Tractor Club Beginnings - by Dave Gohl. I was surprised about a month ago when I got a call from a fellow tractor croonie. His message was interesting and to the point. He's says "Dave, I've been thinking about starting a Two Cylinder club for our area. What do ya think?" It was a loaded question. I said that I would be interested, and was wondering what his next step was. (Although I was talking under my breath, since I thought of this some years ago) My friend, Arlyn Lamb of Lakeville, Minnesota was sincere in his miss
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