The Honda 400ex is a popular ATV model known for its durability and power. However, sometimes the ignition system on this ATV can cause problems for enthusiasts. In this article, we will explore the ignition wiring diagram for the Honda 400ex, including the components and their functions. We will also provide a FAQ section to answer some common questions about this topic.
Ignition Wiring Diagram Components
The ignition wiring diagram for the Honda 400ex consists of several key components:
| Component | Function |
|---|---|
| Battery | Stores and supplies electrical energy to the system |
| Ignition Switch | Allows the rider to turn the system on and off |
| Starter Relay | Controls the electric starter motor |
| CDI Box | Converts low voltage from the battery to high voltage needed to fire the spark plug |
| Coils | Creates the electrical current needed to fire the spark plug |
| Spark Plug | Ignites the fuel in the combustion chamber |
Understanding the role of each component is crucial to troubleshooting any issues with the ignition system.
The Wiring Diagram
Below is the wiring diagram for the Honda 400ex ignition system:
Each wire is color-coded to help identify it. It’s important to note that the wiring diagram may differ slightly depending on the model year.
FAQ
1. Why does my Honda 400ex not start?
There are a few potential reasons why your ATV may not start:
- The battery may be dead: Check the battery with a multimeter for proper voltage
- The starter relay may be faulty: Test the relay with a multimeter
- The spark plug may be fouled or damaged: Check the spark plug and replace if necessary
- The CDI box may be faulty: Test the CDI box with a multimeter
2. How do I test the CDI box?
Follow these steps to test the CDI box:
- Remove the CDI box from the ATV
- Set your multimeter to resistance mode
- Check the resistance between the two primary coil terminals: It should be between 0.1 and 0.5 ohms
- Check the resistance between the primary coil terminal and the spark plug terminal: It should be between 5,000 and 10,000 ohms
- If the CDI box fails either test, it needs to be replaced
3. Can I use any spark plug with my Honda 400ex?
No, it’s recommended to use the NGK CR7E spark plug for the Honda 400ex. This spark plug has been specifically designed for this ATV model and ensures optimal performance.
4. Why is my ATV running poorly?
Poor running can be caused by a variety of issues, including:
- Fuel system problems: Check the fuel filter, carburetor, and fuel lines for blockages or damage
- Ignition system problems: Check the wiring, CDI box, coils, and spark plug for issues
- Engine compression problems: Check the compression with a compression tester
- Exhaust system problems: Check the exhaust pipe and muffler for blockages or damage
5. Where can I get replacement parts for my Honda 400ex?
You can purchase replacement parts for your Honda 400ex from a Honda dealer or online retailer. It’s important to use genuine Honda parts to ensure proper fit and performance.
In conclusion, understanding the wiring diagram and components of the Honda 400ex ignition system is crucial to troubleshooting any issues with this ATV. By following the steps outlined above and using genuine Honda replacement parts, you can ensure optimal performance and longevity of your ATV.
