The module you describe is the newer variant and wasnt nearlly bas with failure as some I have seen. here is a couple of ideas I would try...
Remove the kill wires from the back of the carby, tape them up and keep them seperate (dont have to tape them up but make sure they dont tough the body or each other) Check colour of the spark.
Thouroughly clean the coil where the bolts go through, the bolts and the plate where the coil mounts to with steel wool/sandpaper to make sure its earthed well...
I would have a spare second hand coil (probably have at least a dozen) but any coil from a side pull start series 80 victa should work sufficiently.
