there are too many factors, depends on how high your liability limits are and if you have full coverage (collision, theft, etc).
If its just liability, it won't be too much more, but when you add full coverage, the rate skyrockets for what they classify as "high performance bikes" esp if you are young.
I paid about 450 for the year for full coverage on my 500 with moderate liability rates, not the most, but not the least either. It would have been almost 1100 for the exact same coverage through the same company on a zx6r, oh and i think the deductible was a few hundred higher too