seriously, just buy a new ignition switch, pop a few nuts n bolts out, and install a new one for about 30 bucks...
you'll have to figure out a way to get into the gas tank and whatever else uses that key though..
the other option is to buy a blank key off ebay and pay a locksmith a hundred or so to make you a new key...
dealership will charge a ton of money for this... just.. find the blank and have a locksmith do it...
Aside from that, unless you locked the forks before you lost the key, it's REALLY easy to hotwire these things.... you just have to know the wiring diagram and trace a few wires...
if you DID lock the forks, then you can still hotwire it, but.... you'll only be able to ride in tight circles.... which may be fun too.... work on your knee dragging skills on the left side.. or you can do what most of the crotch rocket dudes do around here and ride it on one wheel everywhere you go...
-Your servant is your master-