Autolite Marine Spark Plug, 2645 is designed for Select Evinrude, Johnson, Mariner, Mercury Marine and Outboard Motors. All Autolite Marine Spark Plugs are premium marine spark plugs engineered to resist corrosion in fresh and salt water applications. These plugs feature a copper core center electrode, preventing pre-ignition. Autolite is the leading supplier of spark plugs; offering the best alternative to OE spark plugs, providing OE form, fit and function. If you take care of your engine once a year, it will take care of you all season long. Autolite Copper Spark Plug 2645 for Select Evinrude, Johnson, Mariner, Mercury Marine and Outboard Motors: The Autolite Marine Spark Plug, 2645 replaces the following spark plugs: Champion (QL77JC, QL78YC, L77JC4): NGK (BZ7HS-10) Fits select models of these popular applications. Check your owner's manual for the spark plug to replace. Outboard motors: Johnson, Evinrude, Mercury Marine, Outboard Jet. Jet boats: Sugar Sand, Euroline, Dynasty, North Star, Sea Ray. Inboard stern drive motors: Mercruiser, OMC Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof). Multi-rib insulator reduces danger of "flash-over". One-piece terminal post adds strength to spark plug. Resistor reduces radio frequency interference (RFI) and electrode erosion. Cold-formed steel shell precision rolled threads Full copper core electrode provides better performance in all conditions Autolite highly recommends that you consult with your equipment's repair manual for specific instructions for changing the spark plug.
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