hi guys
i also ave an 1990 exup and by christ i thought my fzr750 was quick the exup is a completely different bike
they are not for the faint hearted as they rip your arms off as the exup opens fully thats if you havent turned the bike upside down.
usuall things to look for is blown forks seals, binding brakes. chains and sprockets smoke from the exhaust when reved
hope this helps
ride safe
fzrmad