Or you can try this:
http://www.asuotani.com/fpkit.htmlthis is the manufacturer's website.
The device simply replaces everything from the coils to the ignition units.
You can order them here:
http://www.desmo-racerz.com/allumage-racing.htmlThis is a French mate's online store.
Or maybe source it somewhere else more easily.
My mate tried it on its 1991 900SS, and according to him it is just spectatular.
You can tune almost everything you want using the provided settings.
I've seen one on a Laguna Seca hardcore tuned. Did not see it run, but the guy was told to go well on tracks...
Costs a little bit however...