CDI Box Yamaha CDI Wiring Diagram: Everything You Need to Know

If you own a Yamaha motorcycle, then you know how important the CDI box is to your bike’s operation. However, if you’re like many Yamaha owners, you might not fully understand what the CDI box does and how it works. In this article, we’ll take a look at everything you need to know about the CDI box and the wiring diagram for Yamaha motorcycles.

What is a CDI Box?

The CDI (Capacitor Discharge Ignition) box is an electronic device that controls the ignition system of a motorcycle. It’s responsible for taking the low voltage signal from the pickup coil in the stator and amplifying it into a high voltage signal that can be sent to the spark plug to ignite the fuel mixture in the combustion chamber.

The CDI box does this by storing electrical energy in a capacitor and then discharging it into the primary winding of the ignition coil. This creates a spark at the spark plug, which ignites the fuel mixture.

The CDI box is also responsible for controlling the timing of the spark, which is crucial to your bike’s performance. If the timing is off, then your bike won’t run properly and may even suffer damage to the engine.

Types of CDI Boxes

There are two main types of CDI boxes: analog and digital. Analog CDI boxes use an analog signal to control the ignition system, while digital CDI boxes use a digital signal. Digital CDI boxes are more precise and can control the timing of the spark more accurately than analog boxes.

How to Test a CDI Box

If you’re having problems starting your Yamaha motorcycle, then it’s possible that your CDI box is faulty. Here are the steps to test your CDI box:

  1. Remove the CDI box from your bike.
  2. Use a multimeter to test the resistance of the pickup coil and the ignition coil.
  3. Check the wiring between the CDI box and the coils for continuity.
  4. If everything checks out, then the problem may be with the CDI box itself.
  5. You can test the CDI box by connecting a spark plug to the spark plug wire and grounding it to the engine.
  6. Turn on the ignition and crank the engine. If you see a spark at the spark plug, then the CDI box is working properly.

Yamaha CDI Wiring Diagram

The wiring diagram for Yamaha motorcycles can be a bit confusing, especially if you’re not familiar with electrical systems. However, if you take the time to understand the diagram, then you’ll be able to troubleshoot problems with your bike’s electrical system.

Here’s a basic Yamaha CDI wiring diagram:

Wire Color Connection
Black/White Ground
Green Pickup Coil Signal
Yellow/Red Ignition Coil Positive
Black/Yellow Ignition Coil Negative
Black/Red CDI Positive
Orange CDI Negative

Frequently Asked Questions About Yamaha CDI Boxes

Q: What is the purpose of a CDI box?

A: The CDI box controls the ignition system of a motorcycle and is responsible for creating the spark that ignites the fuel mixture in the combustion chamber.

Q: How do I know if my CDI box is faulty?

A: If your bike won’t start, then it’s possible that your CDI box is faulty. You can test your CDI box using a multimeter and a spark plug.

Q: Can I replace my CDI box with an aftermarket one?

A: Yes, you can replace your CDI box with an aftermarket one. However, it’s important to make sure that the aftermarket CDI box is compatible with your bike’s make and model.

Q: How much does a CDI box cost?

A: The cost of a CDI box varies depending on the make and model of your bike. Generally, you can expect to pay between $50 and $200 for a new CDI box.

Q: Can I repair a faulty CDI box?

A: It’s possible to repair a faulty CDI box, but it’s often more cost-effective to replace it with a new one.

Conclusion

The CDI box is a crucial component of your Yamaha motorcycle’s ignition system. By understanding how it works and how to troubleshoot problems, you can keep your bike running smoothly and avoid costly repairs. With this article, we hope that you now have a better understanding of the CDI box and the wiring diagram for Yamaha motorcycles.