So The largest I counter sprocket available that I have found is the 17T that I already have.
17T - 20mm ID - 7mm thick - 428 Chain Size - 18mm from L bolt hole center to Rbolt hole center.
The rear I think I found the Derbi Senda-R 125cc sprocket will fit. All of the specs appear to be identical: 56T to 48T - 6 Bolt holes which are paired in 43mm spaces - 103.55mm inner diameter.
http://www.jtsprockets.com/catalogue/model/3348