It´s no problem measuring arcs just marking on a piece of paper on the hub.

As I said before applying this method to my stock spe 26 with a different chinese ignition (from another company) I found out the static angle is just 27,5 degrees, instead of the 40 in the case of the rcexl ignition.

I wonder if such a big difference means a big tolerance for the static angle.

I think better ignition gives you more top rpm and more power, but then the setup angle should be found by moving the sensor by hand at open throttle.