Your scooter should have come with a larger jet and a smooth variator boss. Most US dealers install these before delivering the scooter. The parts should be in a plastic bag under the seat. If you didn't get them, complain to the dealer and tell them that you want the parts that came with the scooter and you want them installed like they should be.
Even with the parts, you're going to peak out around 35-37 on the flats, maybe even a bit less, as you're a bit heavier than I am (no offense).
For more speed, you'll want to do an exhaust and filter (and or remove the intake snorkel). By doing these, you're going to need to test different jet sizes to get the optimum fuel mix.
You'll also want a performance variator with lighter weights, and a torque spring for your clutch that will make it grab later.
Everything I've read tells me that everything I listed here should be enough to get you at least over 40mph and pretty close to 45. This is what I'm slowly working to, but I'm on a tight budget as I've been buying too many parts for my car as well.
