Upgrade your Harley touring bike with Sumax’s 409 Pro Race Spark Plug Wire Kit — a proven high-performance wire set built to deliver stronger spark energy and long-term reliability. These 10.4 mm wires use extra-high-temperature silicone rated to 600°F, plus a Spiro-Pro core that provides up to 10x the conductivity of carbon-core wires. Precut, pre-terminated, and USA-made, they’re the perfect plug-and-play upgrade for riders chasing smoother throttle response, crisp ignition, and dependable performance on any bagger build.
Includes • 1 Pair of 10.4 mm Spark Plug Wires • Preinstalled Plug Boots and Coil Boots • Precrimped Terminals (Ready to Install)