you basically have to change out the whole bottom end!
the crank is different that accepts the generator flywheel setup and the case itself has different mounting points.
the cdi has 2 stators and there is a nut to hold the flywheel on not a bolt into the crank like the points generator. the generator style setup that you have will not power the CDI. other than that the CDI itself would bolt right on.
it is nice to have the cdi but if your machine runs....
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83 atc 110
85 big red 250es
95 Kawasaki Mojave
71 SL70 - basket case - picked up 9/9/08
as soon as you're born you start dying so you might as well have a good time - John McCrea