CDI units

 What is this CDI unit?

CDI stands for Capacitor Discharge Ignition. 

An electric ignition device used in a number of different vehicles powered by small engines, including ATVs, UTVs, GoKarts, motorcycles, mini bikes, scooters and lawn mowers. The CDI system works by storing an electrical charge and then discharging it through the ignition coil and spark plug to ignite fuel in the engine. 


Let's talk about what kind of work this CDI is doing in a bike... This CDI does many types of CDI by identifying and giving the required time to start the engine of the motorcycle and... turning off the engine. They can be classified according to the number of pins.... Let's talk one by one





4 pin CDI unit



This CDi works by using the DC 12v electricity from the bike's battery... Now let's see how the pins should be connected here 
01. Trigger = The pulse coil to be connected to this trigger pin
02. Ignition coil = Ignition to this pin. The coil should be connected
03. Ground = A chassis ground / drain terminal should be connected to this terminal
04. Switched DC 12v = 12v power should be supplied to this terminal through an ignition switch / key... this 4 pin when the ignition / key is turned off There should be no electricity... 

5 pin CDI unit.


This CDI works with AC electricity... a separate AC supply is obtained from the coil pack of the bike. 

I will explain separately how to identify the ends of a coil pack.

A bike with this method can be charged even if the battery of the bike is completely defective or the method of charging the battery by the Rectifier is defective. 
Now let's see what parts of the bike this CDI is related to. 
         01 - Timing trigger = The line coming from the pickup coil / pulse coil is connected to this terminal
        02 - Ignition coil = This terminal is connected to the ignition coil
        03 - Ground = This should be connected to a wire in the wire harness
         04 - Kill Switch = If this wire gets a power supply, the engine will stop... When there is no supply, the engine can be started and kept running... As soon as a power supply is given, the engine will stop... It will turn off the ignition coil. By eliminating the coil spark. This terminal loses power after turning on the key.  05 - AC Ignition
           Power - This terminal receives the AC power required to operate the CDI... it always gets the power to start the vehicle... it is supplied by a separate wire from the coil pack... 

Asitha lakshan

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