[blueboy5000]

Stock air filter isn't gonna cut it, it's far to restrictive. You'll need an open-element style air filter.

You engine will now be nearly an 80cc, so I'd suggest #80 to 85 main jet, 90 is most likely going to be too rich.

My big problem here, is that you will need to test your compression after installing the 50mm BBK to determine what kind of fuel you will need. It is likely this BBK will make more than 150lbs compression, which means your bike will need 95 or great octane gasoline to run, and a performance starter.

As to getting the carb right, I would have purchased a "jet kit" which has several different jets, as getting the mixture right is gonna take some swapping. Jet size is dependent on not only the displacement, air flow and exhaust flow, but also on your climate and altitude.