Sprockets are bike specific... In the owners docs it says a husky 2t countershaft sprocket will fit. I tryed, it works. Back sprockets , ktm 4t or husaberg. Lots of aftermarket but ironman sprockets, although pricey, last and they now have a 1 year warranty .
depends what riding you're doing but I'd say 13 x 48 is the tallest you want off-road. 13 x 50 in ****** going and if racing in the tight I'd go 13 x 52. by then your defo on a 116L chain in the middle.
until you get a set of 20mm offsets and then you can go back to 13 x 50 again or even 13 x 48. with the 22s they won't turn hard at any kind of fast pace.