I am similarly in a no spark situation with my IVJ.
I tested the stator source coils ( the large ones )
and found open resitance
The source coil resistance is supposed to be 160 - 240ohm on the brown to red wires.
Mine reads open circuit.
I have recently ordered the electrex manufacturered replacement stator for the IVJ from wemoto Generator Alternator Yamaha and await its arrival.
Does your original stator still produce a spark ?
what are the resistance readings on the source coils of your various stators ?
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