Upgrade the ignition system on select 1971–1985 Harley-Davidson XL models with Drag Specialties E18-6658SDS spark plugs. Designed for dependable service in motorcycle applications, these spark plugs combine durable construction with materials selected for consistent electrical performance, heat resistance, and long service life. They are a suitable replacement option for riders and technicians servicing compatible XL engines.
The black ceramic body features the distinctive Drag Specialties red logo and script, while the insulator is manufactured from 95% pure alumina. This high-quality ceramic provides strong resistance to heat shock and excellent electrical insulation. A multi-rib insulator design helps prevent flashover, supporting reliable ignition performance under demanding operating conditions.
Each E18-6658SDS spark plug also uses a nickel-plated housing to help resist oxidation and corrosion. Multilayer gaskets and a heat-crimping process create a leak-free, gas-tight seal for dependable combustion-chamber service. The copper core electrode offers strong electrical and thermal conductivity while helping prevent oxidation and corrosion. Confirm application compatibility with the motorcycle’s year, model, engine, and manufacturer specifications before installation.
Features:
- Fitment: Designed for select 1971–1985 Harley-Davidson XL models
- Brand: Drag Specialties
- Part Number: E18-6658SDS
- Construction: Black ceramic body with a distinctive red Drag Specialties logo and script
- Insulator: 95% pure alumina provides strong heat-shock resistance and superior electrical insulation
- Ignition Reliability: Multi-rib insulator design helps prevent flashover
- Corrosion Resistance: Nickel-plated housing helps resist oxidation and corrosion
- Sealing: Multilayer gaskets and heat-crimping process provide a leak-free, gas-tight fit
- Electrode: Copper core construction supports electrical and heat conductivity for long service life
- Manufacturer Part Number: E18-6658SDS
- Vendor Part Number: E18-6658SDS