84 had twin spark plugs silver wheels and swingarm safety seat they are the most obvious
83 gold wheels and swingarm normal seat
sometimes people chop and change these models :'(
but you should be able to get an idea
these bikes are great no real issues to look for
just normal maintenance stuff like shock and linkage bushes etc
there was more 1983 models imported to australia than 1984 models
in 1985 there were only 35 imported from japan by kawasaki