NGK Copper Core Spark Plug SILMAR9A9S (6213)

NGK's SILMAR9A9S copper core spark plug (6213) delivers dependable ignition and steady performance for 10mm cylinder systems. Built around a high-conductivity copper core and a rugged insulated body, it minimizes spark drop and resists fouling in diverse driving conditions. The 10mm thread size ensures easy installation across compatible engines, while the durable electrode design provides long life and consistent misfire resistance. Ideal for standard ignition setups and performance-tuned applications alike, this spark plug helps achieve quicker starts, smoother acceleration, and improved fuel efficiency. Choose SILMAR9A9S for reliable, repeatable lighting of the air-fuel mixture and enhanced overall engine responsiveness, backed by NGK's reputation for quality and engine compatibility.