Polini Inner Rotor w/lights on none minarelli engine

[Quanni90]

I brought a polini ac vertical inner rotor for a minarellli engine but i am trying to fit it on my ac vertical sh50. would anyone know how i would go about caculating a safe timing for my bike. Or would it be ok to use the defult 3.1 safe setting for the mina engines?

 

[Zelu]

Minarelli 50cc - 1.7mm u.d.c
Minarelli 70cc tuned - 4.5mm u.d.c
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