Hey todd welcome to the forum. The 2009 was restricted quite a bit. The pipe is a big draw back.
If you are going with a big bore kit get the tecnogas rs2. If you want some better stock performance Upjet to at least an #85 main and put a hole in the stock air box about a 1\4" will do it. Of course you need to replace the cdi with the kymco cobra or an = and remove the drive boss restricion first if it has one.
This should put you in the 50mph range,If you can locate a 2004 or older stock pipe cheap or free 50+ is not a problem.
The biggest bang for the buck after de restriction is open air(k/n) pipe and jetting to match. Another is setting the squish(have the head shaved,around 40,oooths) The performance realy comes to life with this mod (about $20) If you do the removel and intall. Ha! of course there is more but this will give you some great improvments without the cost of the big bore and a new carb. Should be knocking on 60 mph. Good luck!!!