- Superior construction for serious power
- NGK makes plugs for almost every application and riding style
- Versatile plugs with wide operating heat ranges prevent fouling from running too cool and preignition from running too hot
- Features high alumina ceramics for improved heat dissipation and electrical insulation, deep-seated copper core for a wider heat range and a nickel alloy tip for longer life
Fits:
| 2000 | Harley-Davidson | FXR 4 | - | - |
| 1999 | Harley-Davidson | FXR 3 | - | - |
| 1999 | Harley-Davidson | Softail Night Train FXSTB | - | - |
| 1999 | Harley-Davidson | FXR 2 | - | - |
| 1998 | Harley-Davidson | Road Glide FLTR | - | - |
| 1998 | Harley-Davidson | Road King Classic EFI FLHRC | - | - |
| 1998 | Harley-Davidson | Road Glide EFI FLTR | - | - |
| 1997-1999 | Harley-Davidson | Softail Heritage Springer FLSTS | - | - |
| 1997-1999 | Harley-Davidson | Softail Custom FXSTC | - | - |
| 1997-1999 | Harley-Davidson | Softail Springer FXSTS | - | - |
| 1997-1999 | Harley-Davidson | Softail Fat Boy FLSTF | - | - |
| 1997-1999 | Harley-Davidson | Softail Heritage Classic FLSTC | - | - |
| 1997-1998 | Harley-Davidson | Dyna Convertible FXDS-CONV | - | - |
| 1997-1998 | Harley-Davidson | Low Rider FXDL | - | - |
| 1997-1998 | Harley-Davidson | Wide Glide FXDWG | - | - |
| 1997-1998 | Harley-Davidson | Super Glide FXD | - | - |
| 1997 | Harley-Davidson | Softail Bad Boy FXSTSB | - | - |
| 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 | - | - |
| 1995-1996 | Harley-Davidson | Softail Bad Boy FXSTSB | - | - |
| 1995-1996 | Harley-Davidson | Dyna Convertible FXDS-CONV | - | - |
| 1995-1996 | Harley-Davidson | Super Glide FXD | - | - |
| 1995-1996 | Harley-Davidson | Softail Springer FXSTS | - | - |
| 1995-1996 | Harley-Davidson | Softail Custom FXSTC | - | - |
| 1995-1996 | Harley-Davidson | Softail Heritage Classic FLSTC | - | - |
| 1995-1996 | Harley-Davidson | Softail Fat Boy FLSTF | - | - |
| 1995-1996 | Harley-Davidson | Softail Heritage Special FLSTN | - | - |
| 1994-1998 | Harley-Davidson | Road King FLHR | - | - |
| 1994 | Harley-Davidson | Softail Heritage Special FLSTN | - | - |
| 1993-1996 | Harley-Davidson | Wide Glide FXDWG | - | - |
| 1993-1996 | Harley-Davidson | Low Rider FXDL | - | - |
| 1993 | Harley-Davidson | Softail Nostalgia FLSTN | - | - |
| 1993 | Harley-Davidson | Softail Springer FXSTS | - | - |
| 1993 | Harley-Davidson | Softail Custom FXSTC | - | - |
| 1993 | Harley-Davidson | Softail Standard FXST | - | - |
| 1993 | Harley-Davidson | Softail Fat Boy FLSTF | - | - |
| 1993 | Harley-Davidson | Softail Heritage Classic FLSTC | - | - |
| 1992 | Harley-Davidson | Dyna Daytona FXDB | - | - |
| 1992 | Harley-Davidson | Dyna Glide Custom FXDC | - | - |
| 1991-1992, 1994 | Harley-Davidson | Softail Custom FXSTC | - | - |
| 1991-1992, 1994 | Harley-Davidson | Softail Springer FXSTS | - | - |
| 1991-1992, 1994 | Harley-Davidson | Softail Heritage Classic FLSTC | - | - |
| 1991-1992, 1994 | Harley-Davidson | Softail Fat Boy FLSTF | - | - |
| 1991-1992 | Harley-Davidson | Softail Standard FXST | - | - |
| 1990-1993 | Harley-Davidson | Low Rider Convertible FXRS-CONV | - | - |
| 1990 | Harley-Davidson | Softail Fat Boy FLSTF | - | - |
| 1989-1998 | Harley-Davidson | Electra Glide Ultra Classic FLHTCU | - | - |
| 1989-1996 | Harley-Davidson | Tour Glide Ultra Classic FLTCU | - | - |
| 1988-1993 | Harley-Davidson | Low Rider Sport FXRS-SP | - | - |
| 1988-1990 | Harley-Davidson | Softail Springer FXSTS | - | - |
| 1987-1994 | Harley-Davidson | Low Rider Custom FXLR | - | - |
| 1987-1993 | Harley-Davidson | Electra Glide Sport FLHS | - | - |
| 1987-1990 | Harley-Davidson | Softail Heritage Classic FLSTC | - | - |
| 1987 | Harley-Davidson | Low Rider Chrome FXRC | - | - |
| 1986-1994 | Harley-Davidson | Super Glide FXR | - | - |
| 1986-1993 | Harley-Davidson | Low Rider FXRS | - | - |
| 1986-1990 | Harley-Davidson | Softail Custom FXSTC | - | - |
| 1986-1990 | Harley-Davidson | Softail Heritage FLST | - | - |
| 1986-1990 | Harley-Davidson | Softail Standard FXST | - | - |
| 1986 | Harley-Davidson | Sport Glide Grand Touring FXRD | - | - |
| 1985-1994 | Harley-Davidson | Tour Glide Classic FLTC | - | - |
| 1985-1993 | Harley-Davidson | Sport Glide FXRT | - | - |
| 1985-1987, 1995-1998 | Harley-Davidson | Electra Glide Standard FLHT | - | - |
| 1985-1986 | Harley-Davidson | Wide Glide FXWG | - | - |
| 1985 | Harley-Davidson | Low Rider FXSB | - | - |
| 1985 | Harley-Davidson | Low Glide Custom FXRC | - | - |
| 1985 | Harley-Davidson | Fat Bob FXEF | - | - |
| 1985 | Harley-Davidson | Low Glide FXRS | - | - |
| 1984-1998 | Harley-Davidson | Electra Glide Classic FLHTC | - | - |
| 1984-1985 | Harley-Davidson | Softail Standard FXST | - | - |
| 1984 | Harley-Davidson | Disc Glide FXRDG | - | - |
| 1984 | Harley-Davidson | Tour Glide Classic FLTC | - | - |
| 1984 | Harley-Davidson | Low Glide FXRS | - | - |
| 1984 | Harley-Davidson | Sport Glide FXRT |