NGK SPARK PLUG SILMAR8A9S 90992 31909-MJP-G51 HONDA

The NGK SILMAR8A9S Spark Plug is a Laser Iridium plug engineered for high ignitability, longevity, and stable combustion. Designed with fine wire iridium and platinum elements, it offers superior resistance to wear and fouling, and supports efficient engine performance. Features include a fine wire iridium center electrode and fine wire platinum ground electrode for slow wear rate and stable combustion, trivalent metal plating for enhanced anti-corrosion and anti-seizing, corrugated ribs to prevent flashover, a pure alumina silicate ceramic insulator for strength and heat transfer, a copper core for heat removal, and triple seals to prevent leakage. Specifications include a 10mm shell thread diameter, 1.0mm thread pitch, gasket seat type, 26.5mm reach, 9/16 inch (14mm) hex size, solid terminal type, and a 0.035 inch (0.9mm) gap. The center electrode is 0.6mm, fine wire, and non-projected. Cross-reference OEM part number: 31909-MJP-G51.