Quicksilver 883323001 Spark Plug Champion RA8HCThe 810 Spark Plug provides increased conductivity and heat control for goof overall wear by its star feature copper core electrode. The 810 is known for its dependable performance and durability. The spark plug provides superior corrosion resistance and resists fouling.Features Resistor type reduces radio frequency interference (RFI) for onboard electronics; Copper core electrode improves heat conductivity and electrode wear; Gasket seating with threaded removable terminal for secure fit; Compatible with multiple Mercury 4-stroke EFI and Jet models across various serial ranges; Mercury Outboard Application Information: For 40 HP (3 Cyl) Fourstroke 1C049739 and above,; 40-50-60 HP Fourstroke 1C050252 and above.; Interchangeable with: Champion; RA8HC;