Will my aerox stock cranksaft last?
 

My stock 50cc cylinder on my aerox recently broke and im thinking about buying cylinder with more performance either sport 50cc or sport 70cc.
I have stage 6 proreplica,17.5mm carb,stage6 variator,clutch and intake kit but I have stock crancksaft that has been used 6000km now.
I have read that proreplica revs very high and im worried that my crancksaft couldnt handle it with more performance cylinder.

What cylinders would my cranck survive
(Propably ordering from maxiscoot under 150€)