New Yamaha OEM countershaft sprocket attach nut P/N 90179-18020 in the original packaging. This nut is new and in the original factory packaging. It will the models listed below.

• 1962 YDS2 - Transmission Late Type
• 1963 YDS2 - Transmission Late Type
• 1964 TD1B - Transmission
• 1964 YDS3 - Transmission
• 1965 YDS3 - Transmission
• 1965 YDS3C - Transmission
• 1965 YM1 - Transmission
• 1966 TD1C - Transmission
• 1966 YDS3 - Transmission
• 1966 YDS3C - Transmission
• 1966 YM1S - Transmission
• 1967 YDS5E - Transmission
• 1967 YR1 - Transmission
• 1968 DT1 - Transmission
• 1968 YR2 - Transmission
• 1968 YR2C - Transmission
• 1969 DS6C - Transmisson
• 1969 DT1B - Transmission Gear
• 1969 DT1S - Transmission Gear
• 1969 R3 - Transmission
• 1970 DS6B - Transmisson
• 1970 DT1C - Transmission Gear
• 1970 DT1CMX - Transmission Gear
• 1970 R5 - Transmission
• 1970 RT1 - Transmission
• 1970 RT1M - Transmission
• 1970 TD2B (TD2) - Transmission
• 1970 TR2 TR2B (TR2) - Transmission
• 1971 DT1E - Transmission
• 1971 DT1MX - Transmission
• 1971 R5B - Transmission
• 1971 RT1B - Transmission
• 1971 RT1MX - Transmission
• 1971 TD2B (TD2B) - Transmission
• 1971 TR2 TR2B (TR2B) - Transmission
• 1972 DS7 - Transmission
• 1972 DT2 - Transmission
• 1972 DT2MX - Transmission
• 1972 R5C - Transmission
• 1972 RT2 - Transmission
• 1972 RT2MX - Transmission
• 1972 TD3 - Transmission
• 1972 TR3 - Transmission
• 1973 DT3 - Transmission
• 1973 MX250 - Transmission
• 1973 MX360 - Transmission
• 1973 RD250 - Transmission
• 1973 RD350 - Transmission
• 1973 RT3 - Transmission
• 1973 SC500 - Transmission
• 1973 TX500 - Transmission
• 1973 TZ250 - Transmission
• 1973 TZ350 - Transmission
• 1974 DT250A - Transmission
• 1974 DT360A - Transmission
• 1974 MX250A - Transmission
• 1974 MX360A - Transmission
• 1974 RD250A - Transmission
• 1974 RD350A - Transmission
• 1974 SC500A - Transmission
• 1974 TX500A - Transmission
• 1974 TZ250 - Transmission
• 1974 TZ350 - Transmission
• 1974 YZ250A - Transmission
• 1974 YZ360A - Transmission
• 1975 DT250B - Transmission 250B - C - 400B - C
• 1975 DT400B - Transmission 250B - C - 400B - C
• 1975 MX250B - Transmission
• 1975 MX400B - Transmission
• 1975 RD250B - Transmission
• 1975 RD350B - Transmission
• 1975 XS500B - Transmission
• 1975 YZ250B - Transmission
• 1975 YZ360B - Transmission
• 1976 DT250C - Transmission 250B - C - 400B - C
• 1976 DT400C - Transmission 250B - C - 400B - C
• 1976 IT400C - Transmission
• 1976 RD400C - Transmission
• 1976 TT500C - Transmission
• 1976 TZ250C - Transmission
• 1976 TZ350C - Transmission
• 1976 XS360C - Transmission
• 1976 XS500C - Transmission
• 1976 XT500C - Transmission
• 1976 YZ250C - Transmission Yz250d
• 1976 YZ250C - Transmission Yz250c
• 1976 YZ400C - Transmission Yz400d E
• 1976 YZ400C - Transmission Yz400c
• 1977 DT250D - Transmission
• 1977 DT400D - Transmission
• 1977 IT250D - Transmission
• 1977 IT400D - Transmission
• 1977 RD400D - Transmission
• 1977 TT500D - Transmission
• 1977 TZ250D - Transmission
• 1977 TZ350D - Transmission
• 1977 XS360D - Transmission
• 1977 XS360_2D - Transmission
• 1977 XS400D - Transmission
• 1977 XS500D - Transmission
• 1977 XT500D - Transmission
• 1977 YZ250D - Transmission Yz250c
• 1977 YZ250D - Transmission Yz250d
• 1977 YZ400D - Transmission Yz400c
• 1977 YZ400D - Transmission Yz400d E
• 1978 DT250E - Transmission
• 1978 DT400E - Transmission
• 1978 IT250E - Transmission
• 1978 IT400E - Transmission
• 1978 RD400E - Transmission
• 1978 SR500E - Transmission
• 1978 TT500E - Transmission
• 1978 TZ250E - Transmission
• 1978 TZ350E - Transmission
• 1978 XS400-2E - Transmission
• 1978 XS400E - Transmission
• 1978 XT500E - Transmission
• 1978 XT500E_205 - Transmission
• 1978 YZ250E - Transmission Yz250d
• 1978 YZ250E - Transmission Yz250c
• 1978 YZ400E - Transmission Yz400d E
• 1978 YZ400E - Transmission Yz400c
• 1978 XS500 (XS500E) - Transmission
• 1979 DT250F - Transmission
• 1979 RD400F - Transmission
• 1979 SR500F - Transmission
• 1979 TT500F - Transmission
• 1979 TZ250F - Transmission
• 1979 XS400F - Transmission
• 1979 XS400_2F - Transmission
• 1979 XT500F - Transmission
• 1980 SR500G - Transmission
• 1980 TT500G - Transmission
• 1980 TZ250G - Transmission
• 1980 XS400G - Transmission
• 1980 XS400SG - Transmission
• 1980 XT500G - Transmission
• 1981 SR500H - Transmission
• 1981 TT500H - Transmission
• 1981 XS400SH - Transmission
• 1981 XT500H - Transmission
• 1981 XS400 (XS400H) - Transmission
• 1982 XS400SJ - Transmission
• 1984 RZ350L - Transmission
• 1985 FZ750N - Transmission
• 1985 RZ350N - Transmission
• 1985 RZ350NC - Transmission
• 1985 RZ350NCII - Transmission
• 1986 FZ750S - Transmission
• 1986 FZ750SC - Transmission
• 1986 FAZER (FZX700S) - Transmission
• 1986 FAZER (FZX700SC) - Transmission
• 1987 FZ700T - Transmission
• 1987 FZ700TC - Transmission
• 1987 FZR1000T - Transmission
• 1987 FZR1000TC - Transmission
• 1987 FZR750RT - Transmission
• 1987 YFZ350T - Transmission
• 1987 FAZER (FZX700T) - Transmission
• 1987 FAZER (FZX700TC) - Transmission
• 1988 FZ750U - Transmission
• 1988 FZ750UC - Transmission
• 1988 FZR1000U - Transmission
• 1988 FZR1000UC - Transmission
• 1988 FZR400SUC - Transmission
• 1988 FZR400U - Transmission
• 1988 FZR750RU - Transmission
• 1988 BANSHEE (YFZ350U) - Transmission
• 1989 FZR1000W - Transmission
• 1989 FZR1000WC - Transmission
• 1989 FZR400SWC - Transmission
• 1989 FZR400W - Transmission
• 1989 FZR600W - Transmission
• 1989 FZR600WC - Transmission
• 1989 BANSHEE (YFZ350W) - Transmission
• 1990 FZR1000A - Transmission
• 1990 FZR1000AC - Transmission
• 1990 FZR400A - Transmission
• 1990 FZR400SAC - Transmission
• 1990 FZR600AC - Transmission
• 1990 FZR600RA - Transmission
• 1990 FZR600RAC - Transmission
• 1990 BANSHEE (YFZ350A) - Transmission
• 1991 FZR1000B - Transmission
• 1991 FZR1000BC - Transmission
• 1991 FZR600RB - Transmission
• 1991 FZR600RB - Transmission
• 1991 FZR600RBC - Transmission
• 1991 BANSHEE (YFZ350B_MN) - Transmission
• 1992 FZR1000D - Transmission
• 1992 FZR1000DC - Transmission
• 1992 FZR600RD - Transmission
• 1992 FZR600RDC - Transmission
• 1992 YFZ350D - Transmission
• 1992 BANSHEE (YFZ350D_MN) - Transmission
• 1992 TDM850 (TDM850D) - Transmission
• 1992 TDM850 (TDM850DC) - Transmission
• 1993 FZR1000E - Transmission
• 1993 FZR1000EC - Transmission
• 1993 FZR600RE - Transmission
• 1993 FZR600REC - Transmission
• 1993 GTS1000AE - Transmission
• 1993 GTS1000AEC - Transmission
• 1993 BANSHEE (YFZ350E) - Transmission
• 1993 BANSHEE (YFZ350E_MN) - Transmission
• 1993 TDM850 (TDM850E) - Transmission
• 1993 TDM850 (TDM850EC) - Transmission
• 1994 FZR1000F - Transmission
• 1994 FZR1000FC - Transmission
• 1994 FZR600RF - Transmission
• 1994 FZR600RFC - Transmission
• 1994 GTS1000AF - Transmission
• 1994 GTS1000AFC - Transmission
• 1994 YZF750RF - Transmission
• 1994 YZF750RFC - Transmission
• 1994 BANSHEE (YFZ350F) - Transmission
• 1994 BANSHEE (YFZ350F_MN) - Transmission
• 1995 FZR1000G - Transmission
• 1995 FZR1000GC - Transmission
• 1995 FZR600RG - Transmission
• 1995 FZR600RGC - Transmission
• 1995 YZF600RG - Transmission
• 1995 YZF600RGC - Transmission
• 1995 BANSHEE (YFZ350G) - Transmission
• 1995 BANSHEE (YFZ350G_MN) - Transmission
• 1996 FZR600RH - Transmission
• 1996 FZR600RHC - Transmission
• 1996 YZF600RH - Transmission
• 1996 YZF600RHC - Transmission
• 1996 YZF750RH - Transmission
• 1996 YZF750RHC - Transmission
• 1996 BANSHEE (YFZ350H) - Transmission
• 1996 BANSHEE (YFZ350H_MN) - Transmission
• 1997 FZR600RJ - Transmission
• 1997 FZR600RJC - Transmission
• 1997 YZF600RJ - Transmission
• 1997 YZF600RJC - Transmission
• 1997 BANSHEE (YFZ350J) - Transmission
• 1997 BANSHEE (YFZ350J_MN) - Transmission
• 1997 YZF750 (YZF750RJ) - Transmission
• 1997 YZF750 (YZF750RJC) - Transmission
• 1998 FZR600RK - Transmission
• 1998 FZR600RKC - Transmission
• 1998 YZF600RK - Transmission
• 1998 YZF600RKC - Transmission
• 1998 YZF750RK - Transmission
• 1998 YZF750RKC - Transmission
• 1998 BANSHEE (YFZ350K) - Transmission
• 1999 FZR600RL - Transmission
• 1999 FZR600RLC - Transmission
• 1999 BANSHEE (YFZ350L) - Transmission
• 1999 R6 (YZFR6L) - Transmission
• 1999 R6 (YZFR6LC) - Transmission
• 1999 YZF600R (YZF600RL) - Transmission
• 1999 YZF600R (YZF600RLC) - Transmission
• 2000 BANSHEE (YFZ350M) - Transmission
• 2000 R6 (YZFR6M) - Transmission
• 2000 R6 (YZFR6MC) - Transmission
• 2000 YZF600R (YZF600RM) - Transmission
• 2000 YZF600R (YZF600RMC) - Transmission
• 2001 660R RAPTOR (YFM660RN) - Transmission
• 2001 660R RAPTOR (YFM660RNC) - Transmission
• 2001 BANSHEE (YFZ350N) - Transmission
• 2001 CHAMPIONS LIMITED EDITION (YZFR6SN) - Transmission
• 2001 CHAMPIONS LIMITED EDITION (YZFR6SNC) - Transmission
• 2001 YX600R (YZF600RNC) - Transmission
• 2001 YZ600R (YZF600RN) - Transmission
• 2001 YZFR6 (YZFR6N) - Transmission
• 2001 YZFR6 (YZFR6NC) - Transmission
• 2002 660R RAPTOR (YFM660RP) - Transmission
• 2002 BANSHEE (YFZ350P) - Transmission
• 2002 RAPTOR LIMTED EDITION - BLACK (YFM660RPB) - Transmission
• 2002 YZF600R (YZF600RP) - Transmission
• 2002 YZF600R (YZF600RPC) - Transmission
• 2002 YZFR6 (YZFR6P) - Transmission
• 2002 YZFR6 (YZFR6PC) - Transmission
• 2003 BANSHEE (YFZ350R) - Transmission
• 2003 BANSHEE LE (YFZ350LER) - Transmission
• 2003 RAPTOR 660R (YFM660RR) - Transmission
• 2003 RAPTOR BLACK LIMITED EDITION (YFM660RLER) - Transmission
• 2003 YZF600R (YZF600RR) - Transmission
• 2003 YZF600R (YZF600RRC) - Transmission
• 2004 660R RAPTOR (YFM660RS) - Transmission
• 2004 660R RAPTOR LIMITED EDITION BLACK (YFM660RLES) - Transmission
• 2004 BANSHEE (YFZ350S) - Transmission
• 2004 BANSHEE - LIMITED EDITION BLACK (YFZ350LES) - Transmission
• 2004 YZF600R (YZF600RS) - Transmission
• 2004 YZF600R (YZF600RSC) - Transmission
• 2005 660R RAPTOR (YFM660RT) - Transmission
• 2005 BANSHEE (YFZ350T) - Transmission
• 2005 BANSHEE SE (YFZ350SET) - Transmission
• 2005 RAPTOR SE (YFM660RSET) - Transmission
• 2005 YZF600R (YZF600RT) - Transmission
• 2005 YZF600R (YZF600RTC) - Transmission
• 2006 BANSHEE (YFZ350V) - Transmission
• 2006 BANSHEE SE (YFZ350SEV) - Transmission
• 2006 BANSHEE SP (YFZ350SPV) - Transmission
• 2006 YZF600R (YZF600RV) - Transmission
• 2006 YZF600R (YZF600RVC) - Transmission