Spark plug is a Champion QL77JC4. Set them .030.....that's per the book. Set them at .040 for a little better idle without hurting top end.....that's pretty much old scholl.
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When in doubt...use the manual
Rayland, Ohio....Along the Muddy Banks of the Mighty Ohio River.
Spark Plug and Gap for 84 Evinrude
Linear Mode
