sparkplugs.......A

just in case anyone wants to know, several years ago I somehow contacted Autolite, somehow, and they mailed me this big heavy honkin' Autolite spark plug catalog, more information than you ever wanted to know. I think I gave it to local O'Reilly's store.
 
I have been told that if it is a magneto system use a non-resister like a 3116. Someone mentioned a 388 which is a resister plug for noise suppression and is not recommended for magneto systems
 
If its the older unstyled tractor with 7/8 plugs, I prefer the deep reach side wire electrode Autolite 3077

If its a later tractor with 18mm plugs and a MAGNETO I suggest NON Resistor Autolite 3116

If its a later tractor with 18 mm plugs and a battery powered coil ignition, 3116 NON Resistor or 388 Resistor which is a tad hotter then the original heat range 386.

John T
 
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