Top quality Replacement for the KTM 600, ( years 1987-1992) . This unit includes both the CDI and the HT coil. It comes complete with all the necessary connectors and wiring, which makes installation a breeze. This is a high quality part that directly replaces the OEM CDI model. The original 4 stroke CDI Unit is shown below on the right. This CDI/Coil package has 5 wires, your stock CDI may or may not have 4 wires, which is fine.