Paul, youre correct in your statement ..." Running timing is not changed by moving the impulse trip point,..."
JR, If you move the rear stop plate that indeed changes start/impulse timing BUT THAT HAS NOOOOOOOOOOO AFFECT ON THE RUN TIMING.. Once shes over 250 RPM the dog pawl stays tucked inside and does NOT come out so the spring never winds and theres never any wind n trip impulse going on. The run time advance is primarily a function of which drive cup is used (say a 25 advance) and the mags rotational position in the flange plus points gap and wear n tear etc.
If you install the mag back exactly in its same rotational location in the flange, the run timing will be the same EVEN IF YOU ADJUSTED THE REAR STOP PLATE TO CHANGE THE START/IMPULSE TIMING
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