It is 10 spline Tooth!

This Yamaha 664-45981-01-00 .DAMPER RUBBER PROP fits the following models and components:

Yamaha Outboard 1984 25HP 25ESN Lower-Drive 2

Yamaha Outboard 1984 25HP 25LN Lower-Drive 2

Yamaha Outboard 1984 30HP 30ELN Lower-Drive 2

Yamaha Outboard 1984 30HP 30ESN Lower-Drive 2

Yamaha Outboard 1985 25HP 25ELK Lower-Drive 2

Yamaha Outboard 1985 25HP 25ESK Lower-Drive 2

Yamaha Outboard 1985 25HP 25LK Lower-Drive 2

Yamaha Outboard 1985 25HP 25SK Lower-Drive 2

Yamaha Outboard 1985 30HP 30ELK Lower-Drive 2

Yamaha Outboard 1985 30HP 30ESK Lower-Drive 2

Yamaha Outboard 1986 25HP 25ELJ Lower Drive 2 (25H)

Yamaha Outboard 1986 25HP 25ESJ Lower Drive 2 (25H)

Yamaha Outboard 1986 25HP 25LJ Lower Drive 2 (25H)

Yamaha Outboard 1986 25HP 25SJ Lower Drive 2 (25H)

Yamaha Outboard 1987 25HP 25ELH Lower Drive 2 (25H)

Yamaha Outboard 1987 25HP 25ESH Lower Drive 2 (25H)

Yamaha Outboard 1987 25HP 25LH Lower Drive 2 (25H)

Yamaha Outboard 1987 25HP 25SH Lower Drive 2 (25H)

Yamaha Outboard 1987 30HP 30ELH Lower-Drive 2

Yamaha Outboard 1987 30HP 30ESH Lower-Drive 2

Yamaha Outboard 1987 30HP 30LH Lower-Drive 2

Yamaha Outboard 1987 30HP 30SH Lower-Drive 2

Yamaha Outboard 1988 30HP 30ESG Lower-Drive 2

Yamaha Outboard 1988 30HP 30SG Lower-Drive 2

Yamaha Outboard 1989 25HP 25ELF Lower-Drive 2

Yamaha Outboard 1989 25HP 25ESF Lower-Drive 2

Yamaha Outboard 1989 25HP 25LF Lower-Drive 2

Yamaha Outboard 1989 25HP 25SF Lower-Drive 2

Yamaha Outboard 1989 30HP 30ESF Lower-Drive 2

Yamaha Outboard 1989 30HP 30LF Lower-Drive 2

Yamaha Outboard 1989 30HP 30SF Lower-Drive 2

Yamaha Outboard 1990 25HP 25ESD Lower-Drive 2

Yamaha Outboard 1990 25HP 25LD Lower-Drive 2

Yamaha Outboard 1990 25HP 25SD Lower-Drive 2

Yamaha Outboard 1990 30HP 30ELD Lower-Drive 2

Yamaha Outboard 1990 30HP 30ELF Lower-Drive 2

Yamaha Outboard 1990 30HP 30ESD Lower-Drive 2

Yamaha Outboard 1990 30HP 30LD Lower-Drive 2

Yamaha Outboard 1991 25HP 25ELRP Lower-Drive 2

Yamaha Outboard 1991 25HP 25ESHP Lower-Drive 2

Yamaha Outboard 1991 30HP 30ELRP Lower-Drive 2

Yamaha Outboard 1991 30HP 30ESRP Lower-Drive 2

Yamaha Outboard 1991 30HP 30MLHP Lower-Drive 2

Yamaha Outboard 1991 30HP 30MSHP Lower-Drive 2

Yamaha Outboard 1992 25HP 25ELRQ Lower-Drive 2

Yamaha Outboard 1992 25HP 25MLHQ Lower-Drive 2

Yamaha Outboard 1992 25HP 25MSHQ Lower-Drive 2

Yamaha Outboard 1993 25HP 25ELHR Lower-Drive 2

Yamaha Outboard 1993 25HP 25ELRR Lower-Drive 2

Yamaha Outboard 1993 25HP 25ESHR Lower-Drive 2

Yamaha Outboard 1993 25HP 25MLHR Lower-Drive 2

Yamaha Outboard 1993 25HP 25MSHR Lower-Drive 2

Yamaha Outboard 1994 25HP 25ELHS Lower Casing Drive 2

Yamaha Outboard 1994 25HP 25ELRS Lower Casing Drive 2

Yamaha Outboard 1994 25HP 25ESHS Lower Casing Drive 2

Yamaha Outboard 1994 25HP 25MLHS Lower Casing Drive 2

Yamaha Outboard 1994 25HP 25MSHS Lower Casing Drive 2

Yamaha Outboard 1995 25HP 25ELHT Lower Casing Drive 2

Yamaha Outboard 1995 25HP 25ELRT Lower Casing Drive 2

Yamaha Outboard 1995 25HP 25ESHT Lower Casing Drive 2

Yamaha Outboard 1995 25HP 25MLHT Lower Casing Drive 2

Yamaha Outboard 1995 25HP 25MSHT Lower Casing Drive 2

Yamaha Outboard 1995 30HP 30ELHT Lower Casing Drive 2

Yamaha Outboard 1995 30HP 30ELRT Lower Casing Drive 2

Yamaha Outboard 1995 30HP 30ESRT Lower Casing Drive 2

Yamaha Outboard 1995 30HP 30MLHT Lower Casing Drive 2

Yamaha Outboard 1995 30HP 30MSHT Lower Casing Drive 2

Yamaha Outboard 1995 30HP C30ELHT Lower Casing - Drive 2 (Weedless Type)

Yamaha Outboard 1995 30HP C30MLHT Lower Casing - Drive 2 (Weedless Type)

Yamaha Outboard 1996 20HP 20MLHU Lower Casing Drive 2

Yamaha Outboard 1996 20HP 20MSHU Lower Casing Drive 2

Yamaha Outboard 1996 25HP 25ELHU Lower Casing Drive 2

Yamaha Outboard 1996 25HP 25ELRU Lower Casing Drive 2

Yamaha Outboard 1996 25HP 25ESHU Lower Casing Drive 2

Yamaha Outboard 1996 25HP 25MLHU Lower Casing Drive 2

Yamaha Outboard 1996 25HP 25MLHU2 Lower Casing Drive 2

Yamaha Outboard 1996 25HP 25MSHU Lower Casing Drive 2

Yamaha Outboard 1996 25HP 25MSHU2 Lower Casing Drive 2

Yamaha Outboard 1996 30HP 30ELHU Lower Casing Drive 2

Yamaha Outboard 1996 30HP 30ELRU Lower Casing Drive 2

Yamaha Outboard 1996 30HP 30ESRU Lower Casing Drive 2

Yamaha Outboard 1996 30HP 30MLHU Lower Casing Drive 2

Yamaha Outboard 1996 30HP 30MSHU Lower Casing Drive 2

Yamaha Outboard 1997 20HP 20MLHV Lower Casing Drive 2

Yamaha Outboard 1997 20HP 20MSHV Lower Casing Drive 2

Yamaha Outboard 1997 25HP 25ELHV Lower Casing Drive 2

Yamaha Outboard 1997 25HP 25ELRV Lower Casing Drive 2

Yamaha Outboard 1997 25HP 25ESHV Lower Casing Drive 2

Yamaha Outboard 1997 25HP 25MLHV2 Lower Casing Drive 2

Yamaha Outboard 1997 25HP 25MLHV3 Lower Casing Drive 2

Yamaha Outboard 1997 25HP 25MSHV2 Lower Casing Drive 2

Yamaha Outboard 1997 25HP 25MSHV3 Lower Casing Drive 2

Yamaha Outboard 1997 30HP 30ELHV Lower Casing Drive 2

Yamaha Outboard 1997 30HP 30ELRV Lower Casing Drive 2

Yamaha Outboard 1997 30HP 30ESRV Lower Casing Drive 2

Yamaha Outboard 1997 30HP 30MLHV Lower Casing Drive 2

Yamaha Outboard 1997 30HP 30MSHV Lower Casing Drive 2

Yamaha Outboard 1998 25HP 25MLHW3 Lower Casing Drive 2

Yamaha Outboard 1998 25HP 25MSHW3 Lower Casing Drive 2