After installing my bbk I used scrappys 50/16 gears and got a really good gain. If you have a lot if torque you could use a taller gear such as the hoca gears at partsforscooters.com. A lot of the tuning the cvt and gears will be depend on your weight of though.
Thought about it and then just staring thinking about it. I plan on more motor work. The scooter has been sitting outside in the fla sun for two years and looks horrible and it needs tires. Figured just do it all up at once and get it over with.