NGK FR9BI-11 4709 Spark Plug Copper Core FR9BI11

The NGK FR9BI-11 4709 spark plug delivers reliable ignition with a copper core for efficient heat transfer and consistent performance across a range of small to mid-size engines. Its 14mm thread fits standard ignition systems, while the FR9BI11 heat range provides dependable cold starts and smooth idle under varying loads. Constructed with a robust insulator and a durable ground electrode, it resists fouling and wear, extending service life in lawn equipment, generators, and hand tools. Ideal for applications requiring quick, dependable sparks and steady torque. Install with proper torque and gap settings to maximize fuel efficiency and power output.