I just posted a RM250 up for sale for part out. The serial number plate says 1984, but I looked up the number online code sheet- not sure if was reliable source. And it suggested it to be 1985 RM250 - I can't find that link anymore. Anybody know how vin coding works or where to look? Now that I have it for sale, I want to make sure I know what I have - what clues on the bike can I look at to determine age.