Upgrade the ignition performance of your 1975-1999 Big Twin motorcycle with Drag Specialties E18-6663SDS spark plugs. Designed for dependable fitment and long service life, these spark plugs combine durable construction with consistent electrical performance for a reliable ignition system. The black ceramic body and bold red Drag Specialties logo provide a distinctive appearance while maintaining the functionality expected from a quality replacement spark plug.
The insulator is manufactured from 95% pure alumina, providing strong resistance to heat shock and excellent electrical insulation. Its multi-rib design helps eliminate flashover, while the nickel-plated housing resists oxidation and corrosion in demanding operating conditions. Multi-layer gaskets and a heat-crimping process create a leak-free, gas-tight seal for dependable combustion chamber performance.
A copper-core electrode supports strong electrical and thermal conductivity, helping resist oxidation and corrosion while contributing to extended spark plug service life. These Drag Specialties spark plugs are manufactured for fitment on 1975-1999 Big Twin applications. Verify the motorcycle model and ignition specifications before installation to ensure proper compatibility. Manufacturer part number E18-6663SDS and vendor part number E18-6663SDS identify this replacement spark plug set.
Features:
- Fitment: Designed for 1975-1999 Big Twin motorcycle applications
- Brand: Drag Specialties
- Manufacturer part number: E18-6663SDS
- Vendor part number: E18-6663SDS
- Insulator: 95% pure alumina construction provides heat-shock resistance and superior electrical insulation
- Insulator design: Multi-rib configuration helps eliminate flashover
- Housing: Nickel-plated finish resists oxidation and corrosion
- Sealing: Multi-layer gaskets and heat-crimping process provide a leak-free, gas-tight seal
- Electrode: Copper-core construction delivers good electrical and thermal conductivity
- Service life: Durable materials and corrosion resistance support long-lasting spark plug performance
- Appearance: Black ceramic body with bold red Drag Specialties logo and script