Spark Plugs for a TO20

autolite 3116 plugs
I have used these non resistor plugs in my TO35
good spark and it starts good

if they will fit your tractor, I recommend them.
 
+1 to Wellmax's recommendation of Autolite 3116. I installed a set in my TO-20 this past summer. (The Previous Owner was using NGK AB-6, which also seemed to be a fine plug.)
 

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