not sure if u can use 125 tyre on 70,, also not aware pof any thing different from stock config ,, however there are two flavors of tyres for 70cc ,,one is 4 ply rating the standard default onre,, another is 6 ply rating,,that is slightly bigger ue to more layers,, i m using that in my bike,, and m very satisfied,, ride has become verey smooth and soft,,
it could cost u 1200 rs,, buy either service or panther,,