Mercury Spark Plug 8M0180173 is the recommended spark plug for Mercury V12 outboards. Replacement for NGK-LKAR7G-9.
For Mercury 7.6L V12 600hp Verado and 500hp SeaPro outboards (serial No. 3B060051 and above)
Includes four NGK‑ILKAR7G‑9 spark plugs
Check and set gaps per the owner's manual or the emissions control information on the cowling decal
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