CDI Control Units for Motorcycles and Scooters

CDI (Capacitor Discharge Ignition) units are key components in electronic ignition systems for motorcycles and scooters . They manage the precise timing of the spark plug's ignition, ensuring efficient ignition and optimal engine performance.

🔧 What is a CDI?

A CDI is an electronic device that stores and discharges high voltage energy to the spark plug to ignite the air/fuel mixture in the cylinder.

📋 Types of CDI

1. Standard CDI : used on standard motorcycles and scooters, it has a fixed mapping.

2. CDI racing : offers a variable advance curve, optimised for high performance.

3. Limited CDI : present on 50cc scooters, limits engine revs (can be removed to increase speed).

4. Digital CDI : more precise, often software programmable.

⚙️ Symptoms of a faulty CDI

• The engine doesn't start.

• Loss of power or erratic acceleration.

• Popping or misfiring.

• No spark from the spark plug.

🔩 Compatibility

Each CDI is designed for a specific engine model or family. Before replacing it:

• Check the make and model of the motorcycle/scooter.

• Check the ignition type (AC or DC) .

• Look at the pin number and connector.