CDI, or Capacitor Discharge Ignition, is an electronic ignition system used in some motorcycles and other vehicles. The CDI system is responsible for providing spark to the engine’s spark plugs, which in turn ignites the fuel-air mixture in the combustion chamber.
In this article, we will discuss the 6 pin CDI wiring diagram for DC systems. We will cover the basics of CDI system operation, the functions of each pin in the CDI unit, and provide a detailed wiring diagram for the 6 pin CDI unit. We will also answer some common questions about CDI systems.
CDI System Basics
The CDI system consists of several components, including the CDI unit, stator, pickup coil, and ignition coil. The stator is a stationary part of the engine that generates a magnetic field. The pickup coil is located near the flywheel of the engine and generates an AC voltage as the flywheel rotates. The CDI unit converts the AC voltage from the pickup coil into a DC voltage and sends it to the ignition coil.
The ignition coil then transforms the DC voltage into a high voltage that is sent to the spark plugs. This high voltage creates a spark that ignites the fuel-air mixture in the engine’s combustion chamber.
Pin Functions
The 6 pin CDI unit has six pins, each with a specific function. The pinout diagram for the 6 pin CDI unit is shown below:
| Pin No. | Color | Function |
|---|---|---|
| 1 | Green | Ground |
| 2 | Red | Battery Positive |
| 3 | White/Black | Pickup Coil Signal |
| 4 | Yellow/Red | Ignition Coil Positive |
| 5 | Black/White | Kill Switch |
| 6 | Black/Yellow | Ignition Pulse Output |
Pin 1 (Green) is the ground pin and should be connected to the engine or chassis ground. Pin 2 (Red) is the battery positive pin and should be connected to the positive terminal of the battery. Pin 3 (White/Black) is the pickup coil signal pin and should be connected to the output of the pickup coil. Pin 4 (Yellow/Red) is the ignition coil positive pin and should be connected to the positive terminal of the ignition coil.
Pin 5 (Black/White) is the kill switch pin and should be connected to the kill switch. When the kill switch is activated, this pin is grounded, which cuts off the ignition spark. Pin 6 (Black/Yellow) is the ignition pulse output pin and sends a high voltage pulse to the ignition coil to create a spark.
Wiring Diagram
The wiring diagram for the 6 pin CDI unit is shown below:
As shown in the diagram, pins 1, 2, and 3 should be connected directly to the engine or chassis ground, battery positive, and the pickup coil output, respectively. Pins 4 and 5 should be connected to the positive terminal of the ignition coil and the kill switch, respectively. Pin 6 should be connected to the ignition pulse input on the ignition coil.
FAQ
What is the purpose of a CDI unit?
The CDI unit is responsible for providing spark to the engine’s spark plugs. It converts the AC voltage from the pickup coil into a DC voltage and sends it to the ignition coil, which then creates a high voltage spark to ignite the fuel-air mixture in the engine’s combustion chamber.
What is the difference between AC and DC CDI units?
The main difference between AC and DC CDI units is the type of voltage they use. AC CDI units use AC voltage from the pickup coil, while DC CDI units convert the AC voltage to DC voltage before sending it to the ignition coil. DC CDI units are generally more efficient and provide more consistent spark timing than AC CDI units.
What are some common problems with CDI units?
Common problems with CDI units include faulty wiring connections, damaged pickup coils, defective ignition coils, and malfunctioning CDI units. Symptoms of CDI unit problems include no spark, weak spark, or inconsistent spark timing. It is important to diagnose and repair CDI unit problems as soon as possible to avoid engine damage.
Can I replace my CDI unit with a different model?
In general, it is best to replace a faulty CDI unit with the same model as the original. However, some CDI units may be interchangeable with similar models from the same manufacturer. It is important to consult the manufacturer’s specifications and wiring diagrams before installing a new CDI unit.
What is the cost of a new CDI unit?
The cost of a new CDI unit varies depending on the make and model of the vehicle. Prices can range from $50 to over $200 for a new CDI unit. It is important to purchase a high-quality CDI unit from a reputable manufacturer to ensure reliable performance.
Conclusion
In this article, we discussed the 6 pin CDI wiring diagram for DC systems. We covered the basics of CDI system operation, the functions of each pin in the CDI unit, and provided a detailed wiring diagram for the 6 pin CDI unit. We also answered some common questions about CDI systems. By following the wiring diagram and understanding the functions of each pin, you can ensure reliable ignition spark for your motorcycle or other vehicle.
