Posted by John T on January 09, 2020 at 10:59:17 from (174.228.152.231):
In Reply to: Spark Plugs posted by johndeerejim on January 09, 2020 at 06:25:48:
For the later B's with the 18mm plugs if its a Magneto I use NON RESISTOR and that in Autolite would be 3116 which is in the heat range as 386 and 388 resistor plugs. If its a battery powered coil distributor and for whatever reason you wanted resistor plugs Id go with the slightly hotter 388 versus the stock 386.
HOWEVER whats more important (then brand of plug) to reduce plug fouling on old Deeres is to use shutters or air restrictors or thermostats etc to get and keep the temp up and above 180 or so plus don't run the carb any richer then absolutely necessary and insure the air cleaner and piping is free of obstructions and the choke opens fully.
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