The official figures for the FZS600 2002-2003 model is,
Length 2,080mm
Width 710mm
Height 1,180mm
That width of 710 is over the handlebars and lever ends and does not include the mirrors. The mirrors will fold in but with them in the normal position the width is approx 875mm.
The 1998-2001 model FZS600 will be the same except with the standard mirrors in the normal position width probably about 790mm wide. (875mm if the later mirrors are fitted for better rear view for most riders).