Just a note regarding Mikunis,
they have a cast in bell mouth so if you want to use airfilters they will get very big and stick out very much ( the various K&N i tried did).
I just saw an all foam airfilter that will fit perfectly.
please check out :
www.ramair-filters.co.uk and then look for the MR range. For a 36 mm Mikuni the flange is 62 mm , so the MR-011 will fit perfect.
the good thing is that when you touch it with your knee it will bend away but still work ok without a problem unless you are a Gorilla type of guy.
if you do not know the size of your carb bellmouth, have a look for further information at
www.mikuni-topham.de search for your carb and you will find all the measurements.
HTH
Bernd