Exup valve

[mick chiz]

i bought my bike with that noise on it too,under the tank on the right hand side there are 2 cables that can be adjusted to take up the slack that run down to the exup valve.i hope your lucky like me and it can be sorted without removing it.
http://www.cartestsoftware.com/fz1/exupmaintenance.html
this was a tremendous help too the link above it showed me how to cure the rattle
good luck mick