I am no expert but. I think you can get a 80cc kit. I very well could be wrong.
From what I have heard these things fly with a 70cc kit so you may not need more than that. Also you must remember you throw the reliability down the drain when you put a "jug" kit on a scooter that was only designed for so much power.
If you haven't already start small: Full tecnigas exhaust, k&n filter or drilled air box lid, and upgrade the cvt. If you still wanna go faster then get a kit. You'll need to upgrade those things with a kit anyway.