Sumax S49631 10.4mm 409 Pro Race Spark Plug Wire Set Blue for Harley FX/FL

The Sumax S49631 is a high-performance 10.4mm 409 Pro Race spark plug wire set designed specifically for 1965-1999 Harley-Davidson FX and FL models. This blue wire set delivers professional-grade ignition performance for both street and track applications.

Key Features:

• 10.4mm diameter 409 Pro Race construction for maximum performance
• Spiral-wound core with 350 ohms per foot resistance for EMI and RFI suppression
• Continuous heat protection up to 600°F with 102,000 volts dielectric strength
• Low profile 100% silicone PRO BOOTS with vibration-proof double spring locking terminals
• Custom fit design for 1965-1999 Harley-Davidson FX and FL models
• Blue color-coordinated wire and boots
• Compatible with electronic ignition and multiple spark discharge systems

The 409 Pro Race series is recommended for extreme temperatures and racing applications, delivering maximum spark energy without radio frequency interference. Ideal for street racing, drag racing, or track use on vintage and evolution Harley-Davidson motorcycles.