How did you determine the cdi was bad?
Do not allow the plug to spark ungrounded.
With the sparkplug wire connected to the plug. Firmly press the threaded part to the bare metal cooling fin while watching the spark plugs GAP. Now let the clutch out. Gently push the bike forward. Did you see a spark??? Keep trying until you either see a spark or you are sure you did NOT .
You will probably wind up buying another cdi.