When it comes to 2-stroke engines, the ignition system plays a crucial role in the engine’s performance. The ignition system provides the spark that ignites the fuel and air mixture inside the engine’s combustion chamber. One important component of the ignition system is the ignition coil. In this article, we will discuss the wiring diagram of a 2-stroke ignition coil and how it works to provide reliable ignition.
What is an Ignition Coil?
An ignition coil is a high-voltage transformer that converts the low voltage from the battery to the high voltage needed to create a spark in the spark plug. The ignition coil consists of two windings, primary and secondary. The primary winding is connected to the battery, while the secondary winding is connected to the spark plug.
The process of ignition coil operation is as follows: when the ignition switch is turned on, a low voltage current flows through the primary winding, creating a magnetic field. When the current is interrupted, the magnetic field collapses, inducing a high voltage in the secondary winding, which is transferred to the spark plug.
2 Stroke Ignition System
The 2-stroke ignition system is different from the 4-stroke ignition system. In a 2-stroke engine, the timing of the ignition is critical because there are fewer cycles in the engine’s operation. The ignition system must provide a spark at the precise moment when the fuel and air mixture is compressed in the combustion chamber.
There are two types of 2-stroke ignition systems: magneto ignition system and CDI (Capacitor Discharge Ignition) system. The wiring diagram for each system is different, and we will focus on the wiring diagram for the CDI system.
Wiring Diagram for CDI Ignition Coil
The CDI ignition coil system consists of four parts: the CDI unit, the ignition coil, the spark plug, and the pickup coil. The wiring diagram for a CDI ignition coil is as follows:
| CDI Unit | Ignition Coil | Spark Plug | Pickup Coil |
|---|---|---|---|
| Black/Red Wire | Black/Red Wire | – | – |
| Black/Yellow Wire | Black/Yellow Wire | – | – |
| Blue/White Wire | – | – | Blue/White Wire |
| – | Green Wire | – | – |
| – | – | – | Green/Black Wire |
As shown in the table, the CDI unit is connected to the ignition coil using two wires: black/red and black/yellow. The green wire from the ignition coil is connected to the spark plug, while the blue/white wire from the pickup coil is connected to the CDI unit.
FAQ
What are the Symptoms of a Faulty Ignition Coil?
A faulty ignition coil can cause various symptoms, such as misfiring, engine stalling, and poor fuel efficiency. If you notice any of these symptoms, it is recommended to check the ignition system and replace any faulty components, including the ignition coil.
How to Test an Ignition Coil?
To test an ignition coil, you can use a multimeter to check the resistance of the primary and secondary winding. The resistance value should be within the manufacturer’s specifications. Another test is to check the continuity between the spark plug wire and the coil, which should be present when the coil is working correctly.
Can You Use an Ignition Coil from a Different Engine?
No, it is not recommended to use an ignition coil from a different engine. The ignition system is designed for a specific engine, and using a different ignition coil may cause compatibility issues and affect the engine’s performance.
How to Replace an Ignition Coil?
To replace an ignition coil, you need to first disconnect the battery and remove the old ignition coil. Then, install the new ignition coil and connect the wires according to the wiring diagram. Finally, reconnect the battery and test the ignition system to ensure proper operation.
Conclusion
The ignition system is a crucial component of a 2-stroke engine, and the ignition coil plays a vital role in providing reliable ignition. Understanding the wiring diagram of the ignition coil can help diagnose and repair any issues with the ignition system. It is essential to follow the manufacturer’s specifications and recommendations when replacing or repairing any components of the ignition system.
