Where is the key code located on a 2004 Kawasaki Ninja?

Answer 1

The key code will be in one of two spots. The first location will be behind the ignition switch, etched into the black metal housing; think between the ignition switch and front fairing. If you do not see your code there, the lower end of your ignition switch will list this code. With a flashlight and your handlebars turned all the way to the left you can read the key code from looking at the ignition switch from the bottom right of the bike.

This info was for a ninja 250/500 since you did not specify