Welcome to KXForums Ride, no problem with the newb question. We've discussed this alot, and if you want facts from users, try the search button. Aside from that, your KX does not have a lighting coil.
You are going to have to upgrade to the 90-04 KX500 complete ignition to upgrade to a lighting coil. You might score off Ebay. Keep your eyes open.
Again, do a search and read what people with your bikes have discussed.