Favorite Spark plugs

I've never had a problem with Champions. Alot of the time D21's are a better choice even when the chart says to use D16's. Autolites are a good choice too
 
Battery ignition: Autolite 386 (or 388 if the tractor is used only light loads - parades, etc).

Magneto ignition: Autolite 3116
 
i use champion in my tractors, and havent had a problem so why change. i bought an old tractor 2 autolite's and 2 champion's and one autolite broke off in the head when removing them. upon inspection of both i found champion had more meat by the threads and was built better.
 
I use Champion D21's if the tractor isn't going to do much of anything. Anything overhauled recently or worked hard gets Champion D18Y's. I just bought my first box of imported Champions, and even though I haven't installed one yet, I have a sinking feeling that I might be looking for alternatives soon.

AG
 
I'm with Brad, anything but Champion. Nothing but trouble for me. NGK in small engines, AC or Autolite in my tractors.
I bought a set of Champion Platinums for my Nissan Maxima many years ago. Six months later I had all kinds of trouble with it. $800 dollars later at the Nissan dealer the mechanic found that the car would run with all the relays taken out under the hood. He finally found out that my new plugs were leaking voltage and running it back through the ground side of the computer. Sound impossible?? All he did was put in a set of NGK's and that fixed it!!
All the rest of it was labor trying to figure it out.
 
my TO-20 has autolite 386, [dist-points], W-6 need plugs now, which will be autolite 3116 [mag],, J-D B, [mag] 386,,I-H 230, [dist] 386,, wouldn't give my worst tractor pulling buddys champions or A-C, lol,, sounds like i like autolite, huh,,lol
 
Had nothing but trouble with Champions. 386 Autolite works best for me, have also had good luck with AC.
 

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