If you want to upgrade the ignition system of your motorcycle with a new CDI unit, then you must have a good understanding of the wiring diagram. In this article, we will discuss the 5 wire CDI wiring diagram in detail, so you can easily install it without any hassle. So, let’s get started!
Introduction to CDI
A capacitor discharge ignition (CDI) system is an electronic ignition system used in motorcycles, scooters, and other small engines. The primary function of the CDI unit is to supply high-voltage power to the spark plug, which ignites the fuel-air mixture in the engine. The CDI system is more reliable and efficient than the conventional contact point ignition system.
The CDI unit consists of four main components – a stator, a flywheel, a CDI box, and a spark plug. The stator generates the electrical power, which is then stored in the capacitor of the CDI box. When the trigger signal is received from the pickup coil, the capacitor releases the stored energy, which ignites the spark plug.
5 Wire CDI Wiring Diagram
The 5 wire CDI system is the most common type of CDI unit used in motorcycles. It consists of five wires – two wires for the charging coil, one wire for the trigger signal, one wire for the kill switch, and one wire for the ground. Let’s take a look at the wiring diagram:
| Wire Color | Function |
|---|---|
| Black/Red | Charging Coil |
| Green | Charging Coil |
| Blue | Trigger Signal |
| Black | Kill Switch |
| Green/Yellow | Ground |
Here’s what each wire does:
Black/Red and Green Wires
The black/red and green wires are connected to the charging coil of the stator. They supply the electrical power to the CDI box, which is then stored in the capacitor.
Blue Wire
The blue wire is connected to the trigger signal of the pickup coil. It sends a signal to the CDI box when the piston is at the top dead center (TDC) of the compression stroke, which is used to fire the spark plug.
Black Wire
The black wire is connected to the kill switch. When the switch is turned off, it grounds the CDI unit, which stops the engine from running.
Green/Yellow Wire
The green/yellow wire is the ground wire. It is connected to the frame of the motorcycle, which provides a common ground for the electrical system.
Frequently Asked Questions
Q: What is a CDI unit?
A: A CDI unit is an electronic ignition system used in motorcycles, scooters, and other small engines. It supplies high-voltage power to the spark plug, which ignites the fuel-air mixture in the engine.
Q: What are the components of a CDI unit?
A: The CDI unit consists of four main components – a stator, a flywheel, a CDI box, and a spark plug. The stator generates the electrical power, which is then stored in the capacitor of the CDI box. When the trigger signal is received from the pickup coil, the capacitor releases the stored energy, which ignites the spark plug.
Q: What is the difference between a CDI and a contact point ignition system?
A: The CDI system is more reliable and efficient than the contact point ignition system. The CDI system uses electronic components to control the ignition timing, while the contact point system uses a mechanical cam to open and close the contact points.
Q: Can I install a CDI unit on any motorcycle?
A: No, you cannot install a CDI unit on any motorcycle. You must check the compatibility of the CDI unit with your motorcycle’s make and model before installing it.
Q: Is it easy to install a CDI unit?
A: Yes, it is relatively easy to install a CDI unit if you have basic knowledge of electrical wiring and the necessary tools. However, if you are not confident, it is better to seek professional help.
Q: Can a faulty CDI unit cause starting problems?
A: Yes, a faulty CDI unit can cause starting problems, as it is responsible for the ignition system of the engine. If the CDI unit is not working correctly, the engine may not start or may misfire.
Conclusion
The 5 wire CDI wiring diagram is essential knowledge for anyone who wants to upgrade their motorcycle’s ignition system with a new CDI unit. With this wiring diagram, you can easily install the CDI unit without any hassle. We hope this article has provided you with a good understanding of the 5 wire CDI system.
