An excellent replacement for the OEM CDI for this bike (454 LTD), and at the best price I could find. Kawasaki no longer makes these so your only hope is aftermarket or find a used one - which is probably on its way to failing already.
This CDI module fixed my ignition problems immediately, after having gone over the whole rest of the electrical system from the alternator to the spark plugs and everything in between. Engine sounds even better than I remember, so you can be certain of proper advance timing.