Spark Plugs 1975-1999 Big Twin
- Plugs have a unique look with a 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 the insulator eliminates flashover
- Nickel-plated housing prevents oxidation and corrosion
- Multi-layer gaskets and heat crimping process ensure a leak-free, gas-tight seal
- Copper core electrode prevents oxidation and corrosion, has good electrical and heat conductivity and creates long spark plug service life
- Fitment:
- 1999 Harley-Davidson Softail Night Train FXSTB
- 1998 Harley-Davidson Road King Classic EFI FLHRC
- 1998 Harley-Davidson Road Glide FLTR
- 1998 Harley-Davidson Road Glide EFI FLTR
- 1997-1999 Harley-Davidson Softail Heritage Springer FLSTS
- 1996-1998 Harley-Davidson Road King EFI FLHR
- 1996 Harley-Davidson Tour Glide Ultra Classic EFI FLTCU
- 1995-1998 Harley-Davidson Electra Glide Ultra Classic EFI FLHTCUI
- 1995-1998 Harley-Davidson Electra Glide Classic EFI FLHTCI
- 1995-1998 Harley-Davidson Super Glide FXD
- 1995-1998 Harley-Davidson Dyna Convertible FXDS-CONV
- 1995-1997 Harley-Davidson Softail Bad Boy FXSTSB
- 1994-1998 Harley-Davidson Road King FLHR
- 1994-1996 Harley-Davidson Softail Heritage Special FLSTN
- 1993-1998 Harley-Davidson Wide Glide FXDWG
- 1993-1998 Harley-Davidson Low Rider FXDL
- 1993 Harley-Davidson Softail Nostalgia FLSTN
- 1992 Harley-Davidson Dyna Glide Custom FXDC
- 1990-1999 Harley-Davidson Softail Fat Boy FLSTF
- 1990-1993 Harley-Davidson Low Rider Convertible FXRS-CONV
- 1989-1998 Harley-Davidson Electra Glide Ultra Classic FLHTCU
- 1989-1996 Harley-Davidson Tour Glide Ultra Classic FLTCU
- 1988-1999 Harley-Davidson Softail Springer FXSTS
- 1988-1993 Harley-Davidson Low Rider Sport FXRS-SP
- 1987-1999 Harley-Davidson Softail Heritage Classic FLSTC
- 1987-1994 Harley-Davidson Low Rider Custom FXLR
- 1987 Harley-Davidson Low Rider Chrome FXRC
- 1986-1999 Harley-Davidson Softail Custom FXSTC
- 1986-1994 Harley-Davidson Super Glide FXR
- 1986-1993 Harley-Davidson Low Rider FXRS
- 1986-1990 Harley-Davidson Softail Heritage FLST
- 1986 Harley-Davidson Sport Glide Grand Touring FXRD
- 1985 Harley-Davidson Low Glide Custom FXRC
- 1984-1993 Harley-Davidson Softail Standard FXST
- 1984-1985 Harley-Davidson Low Glide FXRS
- 1984 Harley-Davidson Disc Glide FXRDG
- 1984 Harley-Davidson Electra Glide Special FLHX
- 1983-1998 Harley-Davidson Electra Glide Classic FLHTC
- 1983-1993 Harley-Davidson Sport Glide FXRT
- 1983-1985 Harley-Davidson Low Rider FXSB
- 1983, 1985-1987 Harley-Davidson Electra Glide Standard FLHT
- 1983 Harley-Davidson Disc Glide FXDG
- 1982-1983 Harley-Davidson Super Glide II FXR
- 1982-1983 Harley-Davidson Super Glide II FXRS
- 1981-1982 Harley-Davidson Electra Glide Classic FLH
- 1981 Harley-Davidson Electra Glide Heritage FLH
- 1980-1994 Harley-Davidson Tour Glide Classic FLTC
- 1980-1984 Harley-Davidson Wide Glide FXWG
- 1980-1983 Harley-Davidson Tour Glide FLT
- 1980-1982, 1987-1993 Harley-Davidson Electra Glide Sport FLHS
- 1980-1982 Harley-Davidson Sturgis FXB
- 1979-1982 Harley-Davidson Low Rider FXS
- 1979-1981, 1985 Harley-Davidson Fat Bob FXEF
- 1979-1980 Harley-Davidson Super Glide 80 FXE
- 1979-1980 Harley-Davidson 1200 Fat Bob FXEF
- 1978-1984 Harley-Davidson Electra Glide FLH
- 1977-1979 Harley-Davidson 1200 Low Rider FXS
- 1975-1980 Harley-Davidson 1200 Super Glide FXE
- 1975-1980 Harley-Davidson 1200 Electra Glide FLH
- 1975-1980 Harley-Davidson Electra Glide FL
- 1975-1978 Harley-Davidson 1200 Super Glide FX