How do you know if your CDI is bad?

How do you know if your CDI is bad?

Symptoms could include misfiring, dead cylinders, backfiring, bizarre tach behavior, and countless other things related to how your engine’s running. The problem may get worse as the bike warms up. It might not even hold low revs at all.

What is Vespa CDI?

Think of it as a horseshoe magnet rolled into a circle. The Stator is the plate holding all of the electrical coils of wire, which powers the bike’s lights, ignition and battery charging circuits. The CDI box has to absorb the electrical pulse as completely as possible to ensure a good spark at the spark plug.

How does a CDI ignition system work?

Working Principle of a CDI System. A capacitor discharge ignition works by passing an electrical current over a capacitor. This type of ignition builds up a charge quickly. A CDI ignition starts by generating a charge and storing it up before sending it out to the spark plug in order to ignite the engine.

How do I bypass CDI?

Follow the following directions to effectively bypass your CDI box by carrying out an ignition coil resistance test (“bench test”).

1. Clear Your Bench.
2. Remove the CDI Box.
3. Check the Resistance Specifications.
4. Measure the Primary Coil Resistance.
5. Measure the Secondary Coil Resistance.
6. Compare the Readings.

Does CDI ignition need battery?

Most CDI ignition problems experienced in a street-ridden motorcycle originate within the charging system or battery. Unfortunately, the battery must also power the motorcycle’s lights as well.

Is it possible to bypass a CDI box?

You can temporarily bypass a CDI box for troubleshooting purposes. The box amplifies the small signal generated from the spinning magnet located in front of the pickup coil in the stator, just before top dead center (TDC), when your fuel-air mixture is ignited. The box can’t generate continuous sparks.

Where is the charging coil on a Vespa?

The Stator is the plate holding all of the electrical coils of wire, which powers the bike’s lights, ignition and battery charging circuits. The charging coil is one coil on the stator that produces the 6 volts needed by the condensor, C1, inside the CDI box.

How does a CDI box work on a Vespa?

As the flywheel turns past the charge coil, the charge coil produces an alternating current from +6V to -6V. The CDI box has a collection of semiconductors that regulate the flow of electricity. The Rectifier connected to G1 on the box allows only the positive pulse enter the condensor, C1.

How does the rectifier work on a Vespa P series?

The Rectifier connected to G1 on the box allows only the positive pulse enter the condensor, C1. So when the wave enters the CDI, the Rectifier allows only the postive part of the wave through to the capacitor and blocks the negative part.

How does the charging coil on a CDI work?

The charging coil is one coil on the stator that produces the 6 volts needed by the condensor, C1, inside the CDI box. The charging coil supplies a single pulse of power based on the flywheel’s movement around the field. The CDI box has to absorb the electrical pulse as completely as possible to ensure a good spark at the spark plug.