Your year model code is found on the bottom right hand corner of your serial number decal. It will be a single letter as per the diagram below which can then be matched to the chart. Note: The letters will repeat in the below chart so use your judgement as to the correct year, ie: the engine in the picture is a 2003 model and not a 1982 model. From 2019 and onwards there is no letter code for the year. Under the cowl on the powerhead there will be a sticker a bit under 1 inch square with the year of manufacturer on it.
MUST READ - the sticker on the left is a 115hp 2 stroke engine. The sticker on the right is a post 2019 model 90hp 4 stroke engine. The F designates 4 stroke. Yamaha service kits for 4 stroke engines also work off the model code. The model code for this 90hp is the LB part. L represent Long Shaft but its the B that's important. The 6FP part is NOT important. MAKE SURE YOU KNOW WHAT YOUR MODEL CODE IS WHEN SELECTING A SERVICE KIT.

1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 |
Z | Y | X | W | V | U | T | S | R | Q |
1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 |
P | L | K | J | H | G | F | D | C | B |
1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 |
A | Z | Y | X | W | V | U | T | S | R |
2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 |
Q | P | N | K | J | H | G | F | D | C |
2013 | 2014 | 2015 | 2016 | 2017 | 2018 | ||||
B | A | Z | Y | X | W |