The old Champion number was D-16. In my experience, the Autolite 386 is far better than Champion.
a229814.jpg
 
(quoted from post at 11:13:20 06/18/16) What are the proper spark plugs for a z120?
Trying to match the modern equivalent from
the manual with no success.
Many on the YT Board recommend Autolite 3116, a non-resistor plug. I installed a set when I was refurbing my TO-20, and they seem to work fine.

I took out a set of NGK AB-6 that a previous owner installed; they are recommended, too.
 
I use to have good luck with any type of Champion plugs
but the last few years have had trouble with any type .
 

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