Do a research on older posts.
This problem has been solved way back in Sept 2011.
'' ...As for the intake, the following intake adapter, coupled with a Mikuni Vm16 will fit without any major modifications. (a bit of shimming here and there)
You can also keep your stock air filter box.
Garelli VIP polini 19mm shorty PHBG intake
A big improvement over the original carb.