[HawgRyder]

The quick answer is yes.
But....the coil for a CDI unit has higher turns (bigger number of turns) than a regular 12V coil....so....if you just put in 12V and interrupted it with a transistor operating at 12V then your spark output would be less than needed for ignition.
So...by all means...change to a transistor type ignition if you like...but replace the coil with a standard 12V type to get the correct voltage of spark.
Or....why not just get a working CDI unit?
Bob