When it comes to the wiring of a 2 stroke CDI, it can be quite complicated. A CDI, or Capacitor Discharge Ignition, is an electronic ignition system that is used to ignite the spark plug in 2 stroke engines. In this article, we will take a closer look at the wiring diagram of a 2 stroke CDI and provide you with all the information that you need to know.
What is a 2 Stroke CDI?
A 2 stroke CDI is a specific type of CDI that is designed to work with 2 stroke engines. It replaces the traditional points and condenser ignition system that was used in older 2 stroke engines.
A CDI works by storing an electrical charge in a capacitor, and then releasing that charge to the ignition coil. The ignition coil then transforms this energy into a high voltage spark that is used to ignite the fuel mixture in the combustion chamber of the engine, resulting in the engine starting and running.
The Wiring Diagram of a 2 Stroke CDI
Now that we have a basic understanding of what a 2 stroke CDI is, let’s take a closer look at its wiring diagram.
| Wire Color | Function |
|---|---|
| Black/White | Ground |
| White | Ignition Coil |
| Red | Power Input |
| Green | Kill Switch |
| Yellow/Red | Trigger Wire |
Black/White Wire – Ground
The black/white wire is the ground wire of the CDI. It is usually connected to the frame of the bike or the engine block to provide a good ground connection.
It is important to make sure that this wire is properly connected, as a poor ground connection can cause all sorts of electrical problems, such as poor spark, misfires, and even damage to the CDI itself.
White Wire – Ignition Coil
The white wire connects to the ignition coil of the engine. It is responsible for delivering the electrical charge from the CDI to the ignition coil, which then transforms it into a high voltage spark that is used to ignite the fuel mixture.
It is important to make sure that this wire is properly connected to the ignition coil, as a poor connection can cause poor spark and misfires.
Red Wire – Power Input
The red wire is the power input wire of the CDI. It is usually connected to the battery or the main power source of the bike.
It is important to make sure that this wire is properly connected to the appropriate power source, as a poor connection can cause the CDI to malfunction or even fail altogether.
Green Wire – Kill Switch
The green wire is connected to the kill switch of the bike. When the kill switch is engaged, it grounds out the electrical signal from the CDI, effectively killing the engine.
It is important to make sure that this wire is properly connected to the kill switch, as a poor connection can cause the engine to not shut off properly, which can be dangerous.
Yellow/Red Wire – Trigger Wire
The yellow/red wire is the trigger wire of the CDI. It receives a signal from the pickup coil or the stator of the engine, which is used to determine the timing of the electrical charge delivery to the ignition coil.
It is important to make sure that this wire is properly connected to the pickup coil or stator, as a poor connection can cause misfires and even engine damage.
Frequently Asked Questions
What is the purpose of a CDI?
The purpose of a CDI is to ignite the spark plug in an engine. It replaces the traditional points and condenser system that was used in older engines.
What are the benefits of a CDI?
A CDI provides a more reliable ignition system compared to the traditional points and condenser system. It also provides a stronger and more consistent spark, resulting in improved performance and fuel efficiency.
What are the common problems with a CDI?
Common problems with a CDI include poor spark, misfires, and even complete failure. These problems are often caused by poor connections, faulty components, or electrical interference.
What are the signs of a bad CDI?
The signs of a bad CDI include poor spark, misfires, and engine stalling. In some cases, the engine may not start at all.
How do I test a CDI?
To test a CDI, you will need a multimeter. Check the resistance of each wire according to the wiring diagram, and compare it to the manufacturer’s specifications. If the resistance is outside of the acceptable range, the CDI may be faulty.
Conclusion:
2 stroke CDI wiring diagrams can be complicated, but with a basic understanding of the wiring and functionality of each wire, it becomes easier to troubleshoot and diagnose any problems that may arise. With proper maintenance and care, a CDI can provide years of reliable ignition performance for your 2-stroke engine.
