Upgrade the ignition performance of compatible 1979–1985 Harley-Davidson XL models with Drag Specialties E18-6661SDS spark plugs. Designed for dependable service in motorcycle applications, these spark plugs combine durable construction, effective heat management, and reliable electrical conductivity. The black ceramic body with bold red Drag Specialties branding provides a distinctive appearance while supporting consistent performance in demanding riding conditions.
The insulator is manufactured from 95% pure alumina for strong resistance to heat shock and excellent electrical insulation. Its multi-rib design helps prevent flashover, while the nickel-plated housing resists oxidation and corrosion. Multilayer gaskets and a heat-crimping manufacturing process create a leak-resistant, gas-tight seal for dependable combustion chamber performance.
A copper-core electrode provides efficient electrical and heat conductivity while helping resist oxidation and corrosion. This construction supports long spark plug service life and reliable ignition operation when properly installed and matched to the application. The Drag Specialties E18-6661SDS spark plugs are intended for fitment on 1979–1985 Harley-Davidson XL models; verify the motorcycle model, engine configuration, and service specifications before installation.
Manufacturer: Drag Specialties
Vendor Part Number: E18-6661SDS
Application: 1979–1985 Harley-Davidson XL models
Features:
- Fitment: Designed for compatible 1979–1985 Harley-Davidson XL models
- Brand: Drag Specialties
- Part Number: E18-6661SDS
- Insulator: 95% pure alumina construction provides strong heat-shock resistance and superior electrical insulation
- Insulator Design: Multi-rib structure helps prevent flashover
- Housing: Nickel-plated finish resists oxidation and corrosion
- Sealing: Multilayer gaskets and heat-crimping process provide a leak-resistant, gas-tight fit
- Electrode: Copper-core construction delivers good electrical and heat conductivity
- Appearance: Black ceramic body with a bold red Drag Specialties logo and script