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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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