NGK Laser Iridium Spark Plug Box of 4 (SILMAR7A9S)

You're getting a box of four NGK Laser Iridium spark plugs, part number SILMAR7A9S. These are designed to be a direct OE replacement, meaning they're built to the same standards as what came from the factory. They're a solid choice for a wide range of vehicles, including models like the Honda Pioneer 1000 series.

What makes these stand out is the iridium-tipped center electrode. Iridium is incredibly hard, about six times harder than platinum, which helps it last much longer and maintain a consistent, stable spark. This is important for getting the best performance and fuel economy from your engine. The pure copper core inside the insulator helps dissipate heat, preventing the plug from getting too hot, while the pure alumina ceramic provides strength and good heat transfer. You'll also find a platinum pad on the ground electrode, which helps with even wear, especially in modern ignition systems.

NGK also uses a trivalent metal plating on the threads, which makes them resistant to corrosion and easier to install without seizing. These plugs are a well-built option for anyone looking to maintain their vehicle's ignition system with reliable, long-lasting parts.