shineray x2 xy250 engine sprocket spline type?

[Ggnihtonwonki]

Sorry if this has been discussed but i am struggling to find sprockets for the shineray 4v dohc 250 watercooled engine.

At first i thought it would be the same sprocket as the honda ax1/nx250 engine as the shineray seems to be an almost direct copy however the nx250 appears to have 11 splines and the shineray is 13.

if anyone knows of any sprockets which might fit would be a great help, preferably id like a 428 sprocket but originally it is 520.

thanks