quesitions about a CDI ignition design

Greetings, I have a few questions. My outboard 1994 Suzuki 2 cycle 9.9hp two
cylinder CDI unit is dead. I have
looked at the waveforms from the coils under the flywheel, magneto, charging
and the two pickup coils all
have healthy outputs. Very little input to the coils that drive the spark
plugs. I want to build the circuits, IGBT and
charging cap, and get the motor running again. My questions are these:

The waveform from the two pickup coils have a leading negative going pulse
followed by a positive going
pulse. Which edge do I use to fire the IGBT? Also the plate that holds all
the coils under the flywheel rotates
with throttle movement. This is some sort of mechanically coupled timing
advance. Would I need some sort of
electronic control of spark timing in addition to the mechanical one?

Thanks in advance.


.

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