Spark Plugs - '48-'74 Big Twin
Features
- Plugs have a unique look with their black ceramic body and bold red logo/script
- Insulator is made of 95% pure alumina; features strong resistance to heat shock and superior insulation
- Multi-rib design of insulator eliminates flashover
- Nickel-plated housing prevents oxidation and corrosion
- Multilayer gaskets and heat-crimping process ensure a leak-free, gas-tight fit
- Copper core electrode prevents oxidation and corrosion and has good electrical and heat conductivity for long spark plug service life
Specs
| Center Electrode Projection | Projected |
| Riding Style | Street |
| Terminal Configuration | Threaded Stud |
| Heat Range | 5 |
| Units | Pair |
| Ground Electrode Configuration | Single |
| Style | Copper |
| Center Electrode Type | Standard |
| Electrode Tip Material | Nickel Alloy |
| Type | Resistor |
| Ground Electrode Shape | Standard |
| Product Name | Spark Plug |
| Year | Make | Model |
|---|---|---|
| 1948 | Harley-Davidson | FL |
| 1949 | Harley-Davidson | EL |
| 1949 | Harley-Davidson | Hydra Glide FL |
| 1950 | Harley-Davidson | EL |
| 1950 | Harley-Davidson | Hydra Glide FL |
| 1951 | Harley-Davidson | EL |
| 1951 | Harley-Davidson | Hydra Glide FL |
| 1952 | Harley-Davidson | EL |
| 1953 | Harley-Davidson | Hydra Glide EL |
| 1953 | Harley-Davidson | Hydra Glide FL |
| 1954 | Harley-Davidson | Hydra Glide EL |
| 1954 | Harley-Davidson | Hydra Glide FL |
| 1955 | Harley-Davidson | Hydra Glide EL |
| 1955 | Harley-Davidson | Hydra Glide FL |
| 1956 | Harley-Davidson | Hydra Glide EL |
| 1956 | Harley-Davidson | Hydra Glide FL |
| 1957 | Harley-Davidson | Hydra Glide EL |
| 1957 | Harley-Davidson | Hydra Glide FL |
| 1958 | Harley-Davidson | Duo Glide FL |
| 1958 | Harley-Davidson | FLH Duo-Glide |
| 1959 | Harley-Davidson | Duo Glide FL |
| 1959 | Harley-Davidson | FLH Duo-Glide |
| 1960 | Harley-Davidson | Duo Glide FL |
| 1960 | Harley-Davidson | FLH Duo-Glide |
| 1961 | Harley-Davidson | Duo Glide FL |
| 1961 | Harley-Davidson | FLH Duo-Glide |
| 1962 | Harley-Davidson | Duo Glide FL |
| 1962 | Harley-Davidson | FLH Duo-Glide |
| 1963 | Harley-Davidson | Duo Glide FL |
| 1963 | Harley-Davidson | FLH Duo-Glide |
| 1964 | Harley-Davidson | Duo Glide FL |
| 1964 | Harley-Davidson | FLH Duo-Glide |
| 1965 | Harley-Davidson | 1200 Electra Glide FLH |
| 1965 | Harley-Davidson | Electra Glide FL |
| 1966 | Harley-Davidson | 1200 Electra Glide FLH |
| 1966 | Harley-Davidson | Electra Glide FL |
| 1967 | Harley-Davidson | 1200 Electra Glide FLH |
| 1967 | Harley-Davidson | Electra Glide FL |
| 1968 | Harley-Davidson | 1200 Electra Glide FLH |
| 1968 | Harley-Davidson | Electra Glide FL |
| 1969 | Harley-Davidson | 1200 Electra Glide FLH |
| 1969 | Harley-Davidson | Electra Glide FL |
| 1970 | Harley-Davidson | Electra Glide FL |
| 1970 | Harley-Davidson | FLH Electra Glide |
| 1971 | Harley-Davidson | Electra Glide FL |
| 1971 | Harley-Davidson | FLH Electra Glide |
| 1971 | Harley-Davidson | FX Super Glide |
| 1972 | Harley-Davidson | Electra Glide FL |
| 1972 | Harley-Davidson | FLH Electra Glide |
| 1972 | Harley-Davidson | FX Super Glide |
| 1973 | Harley-Davidson | Electra Glide FL |
| 1973 | Harley-Davidson | FLH Electra Glide |
| 1973 | Harley-Davidson | FX Super Glide |
| 1974 | Harley-Davidson | Electra Glide FL |
| 1974 | Harley-Davidson | FLH Electra Glide |
| 1974 | Harley-Davidson | FX Super Glide |
| 1974 | Harley-Davidson | FXE Super Glide |
Fitment details provided by supplier.
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