Alot of times if you look and the base of the cylinder there will be a Cm #. That number is the cc's of the bike. for example if it says cm250. Then it's a 250. and so forth.
I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_5bac37c3cb991fdb
SOURCE: Don't know how to decode serial number to find year of manuf.
for motorcycles compare the tenth digit to this chart 1980-A, 1981-B, 1982-C, 1983-D, 1984-E, 1985-F, 1986-G, 1987-H, 1988-J, 1989-K, 1990-L, 1991-M, 1992-N, 1993-P, 1994-R, 1995-S, 1996-T, 1997-V, 1998-W, 1999-X, 2000-Y, 2001-1, 2002-2, 2003-3, 2004-4, 2005-5, 2006-6, 2007-7, 2008-8, 2009-9, 2010-A and it starts over again along the same lines. for quads its the same thing check your tenth digit of the VIN to this chart 1971-1 1983-d 1995 2007- 7 1972-2 1984- e 1996- T 2008- 8 1973-3 1985- f 1997- V 2009- 9 1974-4 1986- g 1998- W 2010- A 1975-5 1987- h 1999- X 1976-6 1988- J 2000- Y 1977-7 1989- K 2001- 1 1978-8 1990- L 2002- 2 1979-9 1991- M 2003- 3 1980-a 1992- N 2004- 4 1981-b 1993- P 2005- 5 1982-c 1994- R 2006- 6
SOURCE: i have a serial number need to know what size
Look on your frame, (or registration) and get the vin number. Take both these numbers to a local Yamaha dealer and he will accurately give you the information you require.
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