In article ,
says...

And if the timing is not correct, the points open when there is no
coil exitation, and you get no spark. That simple. And pretty fussy in
my experience.

This is the concept of the "abrisz" point. For an excellent discussion,
see:

http://www.geocities.com/MotorCity/Speedway/3213/abrisz.html

For points mags to work, the variation in magnetic flux has to
coincide with the operation of the points.

Jim


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