Description
Spark plug wires are often overlooked, but they’re critical to reliable ignition timing and engine performance—especially on high-output builds where weak signals lead to misfires and lost horsepower. SUMAX’s 10.4mm wires deliver the same proven conductor technology as their 8mm counterparts, but with a larger diameter that improves visual impact in the engine bay while maintaining superior heat resistance and electrical consistency. Built in the USA, these wires are a straightforward bolt-on upgrade for ’09-’16 Harley-Davidson FL models.
- Diameter: 10.4mm
- Color: Red
- Fitment: ’09-’16 FL
- Installation: Bolt-on
- Manufacturing: USA-made
- Conductor: Proven SUMAX technology
- Heat resistant construction
- MPN: S40236
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