Electric Scooter Parts - Replacing a CDI Module

One of the most common electric scooter parts in need of replacement, the CDI module is as essential to the ignition system and spark plug motorcycle. Is thought to be an invention of genius Nikola Tesla, capacitor discharge ignition (CDI) is the standard used in most of today's scooters gasoline engines, as well as many motorcycles, outboard motors marine and other small engines. A complete CDI module consists of a transformer, the load circuit, the rectifier, a capacitor, and the trip circuit.

How does the CDI module
The first transformer raises the voltage to 400 to 600 volts. Move along the charging circuit, loads of power capacitor, the rectifier to prevent the capacitor discharges before the point of ignition. Receiving the trigger signal, the trip circuit stops charging and allows the discharge of the capacitor to the ignition coil with low inductance. This increases the original 400 to 600 volts capacitor discharge up to 40 kV in the secondary, jump the gap between electrodes, and ignite the mixture of gas / air in the cylinder. The charging circuit is reconnected and resumed the load capacitor again.

AC or DC?
Most of the scooters we present an alternating current (AC) system, but the popular brand of scooter KYMCO used direct current (DC). As a result, the electrical parts of machinery KYMCO scooter, including the CDI module, it can sometimes be difficult to find.

Engine Size
It is always best to match the size of the CDI engine specifications. CDI module made for a 50cc engine could work on a 100cc, 125cc, 150cc or engine, and some are designed to operate in a range of motor sizes. Others, however, only work for a particular engine displacement. Always check the specifications to ensure you get the right parts on scooter.

2-stroke and 4 stroke motorcycle ignition
The 2-stroke and 4 stroke are quite different, and as a result, the time of its engines' power is entirely different. You can not use a CDI made a 2 stroke in a 4-stroke motorcycle. On the contrary, no CDI can use a 4-stroke scooter in a 2-stroke motorcycle.

Connectors
In many centers of current identification, connectors are an integral part of the jurisprudence of the unit, forming a plug that is attached directly to the wiring harness of the scooter. In other models, the connectors can be placed on the wires, allowing some leeway in exactly where the module is mounted. The skilled mechanic can shorten or lengthen the cables as needed. CDI style connector plugs most common uses two side by side, a 4-pin connector and a 2-pin connector. These connectors can be blades square, rectangular, or simple.

Note: the illustrations of photos of many connectors can be seen on the CDI website listed at the bottom of this article.

Unrestricted or restricted?
A constraint (or runs) CDI provides power no matter how high-rev the engine go. As the Commission controls the spark plug, the plug will continue to fire at high RPM. For reasons that should be obvious, CDI units are made for track use, and are not very suitable for use in the regular way. A CDI module restricted however, to stop shooting once before reaching the engine RPM is reached. Without reaching the actual plug, engine RPM slowly below the pre-established and only then the CDI resume the provision of the socket.

When replacing a CDI module, or any other scooter parts ignition or electric scooter, always a good idea to reference the owner manual. If the manual is lost or otherwise, many manufacturers and brands have downloadable manuals available on their websites.