This is very interesting. Could someone figure things out if they have a light for US spec m103s? I would be interested to know if 750ohms gives us the greatest advance (or lowest retard). Because I mean, Greg said he checked the timing on his Oz deliveries, and found 750 got the most advance (or least retard). A timing light sure beats my seat o the pants meter in determining advance/retard curves... Guidance requested...