(6x) BU8H (6431) Non-Resistor Spark Plug Pre-Gapped fits Mercury & Mariner 25 hp 25 1992-1992 (Mariner) 105 hp 105 Jet 6 cyl 1995-1999 (Mariner) 105 hp 105 Jet 1995-1998 (Mercury) 135 hp 1335 Work 1986-1993 (Mariner) 135 hp 135 Marathon 1986-1999 (Mariner) 135 hp 135 1986-1999 140 hp 140 Jet 1995-1999 150 hp 150 Work (Mariner) 150 hp 150 Magnum III 1992-1997 (Mariner) 150 hp 150 Magnum II 1988-91 (Mariner) 150 hp 150 Magnum EFI 1993-1997 (Mariner) 150 hp 150 Magnum (Mariner) 150 hp 150 EFI 1997-1999 150 hp 150 EFI 1998-1999 (Mercury) 150 hp 150 1979-1999 (Mariner) 150 hp 150 1979-1984, 1991-1999 (Mercury) 150 hp 1500 1978 (Mercury) 150 hp 150 XRi 1993-2002 (Mercury) 150 hp 150 XR-6 1992-1997 (Mercury) 150 hp 150 XR-4 1985-2002 (Mercury) 150 hp 150 XR-2 1985-2002 (Mercury) 150 hp 150 Marathon 1985-1988 (Mercury) 175 hp 175 SKI 1989-1994 (Mariner) 175 hp 175 Magnum EFI 1991-1997 (Mariner) 175 hp 175 EFI 1998-1999 175 hp 175 1978-1998 (Mariner) 175 hp 175 1979-1998 (Mercury) 175 hp 175 XRi 1991-2002 (Mercury) 200 hp 200 Super Magnum EFI 1997 (Mariner) 200 hp 200 Magnum EFI 1989-1997 (Mariner) 200 hp 200 EFI 1998-1999 200 hp 200 1979-1999 220 hp 220 Magnum EFI 1987-1988 (Mariner) 225 hp 220 Super Magnum EFI 1997-1997 (Mariner) 225 hp 225 1980-1981 (Mercury) 245 hp 2.5L 1995-1996 (Mercury) 250 hp 250 3.4L 1989-1990 260 hp 2.5L EFI 1995-1998 (Mariner) 260 hp 2.5L Offshore 1995-1997 (Mercury) 265 hp 2.5L EFI 1997-1997 (Mariner) 265 hp 2.5L SS Drag EFI 1997-1997 (Mercury) 275 hp 275 3.4L 1991-1994 (Mariner) 275 hp 275 1989-1994 (Mercury) 300 hp 300 1981-1983 (Mercury) 300 hp 3.4L 1984-1988 (Mercury) 300 hp 2.5L S3000 EFI 1997-1997 (Mercury)