Welcome aboard.
On some of the 2 stroke bikes they welded a washer inside the manifold end of the exhaust pipe. That can be drilled/punched out.
also inside the air box right at the outlet to the carb is a plastic reducer that restricts the air flow to the carb. That just pulls out. With the muffler clear, and the air box de-restricted you can increase the main jet 1-2 sizes up.
Your variator is the same as all the other Kymco 50cc bikes so use whatever.It's actually the drive boss that is different but a new variator, and rollers for around 50 bucks is a much better way to go. There is also a spring that controls the rear pulley set. That should be upgraded to a Malossi red spring. It will help w/ hills, and take off.
Try calling SPI to see if he has one.
http://www.kymcoforum.com/index.php?topic=11581.0Racing planet is another source.
You can set up a dealer account with either shop to get dealer pricing. It's generally 20-40% off retail.
I PREFER SPI cause the guy is a retired Team Yamaha bike racer. not just another suit but RP usually has a larger inventory.
Stay away from Ebay variators. They will fall apart in 2 strokes. A name brand will last for years.