Electrical Scooter Areas – Changing a CDI Module
A person of the most widespread of electric scooter elements in need to have of alternative, the CDI module is as important to the scooter ignition procedure as the spark plug. Believed to be an invention of the fantastic Nikola Tesla, the Capacitor Discharge Ignition (CDI) is the common process used on most of today’s fuel-powered motor scooters, as very well as on quite a few bikes, maritime outboards and other small engines. A finish CDI module is manufactured up of a transformer, the charging circuit, the rectifier, a capacitor, and the result in circuit.
How the CDI Module Functions
The transformer very first raises the voltage to 400 to 600 volts. Relocating along the charging circuit, the electric powered recent expenses the capacitor, with the rectifier avoiding the capacitor from discharging just before the ignition stage. Acquiring the triggering sign, the induce circuit stops charging and will allow the capacitor to discharge to the very low inductance ignition coil. This will increase the original 400-600 Volt capacitor discharge to as a lot as 40 kV at the secondary winding, leaping the spark plug hole, and igniting the gas/air combination in the cylinder. The charging circuit is then reconnected and resumes charging the capacitor all about once again.
AC or DC?
Most existing scooters us an alternating existing (AC) procedure on the other hand the preferred KYMCO scooter brand uses immediate present-day (DC). As a outcome, electric powered scooter sections for KYMCO equipment, such as the CDI module, can often be challenging to discover.
Motor Dimensions
It is constantly very best to match the motor sizing to the CDI requirements. A CDI module built for a 50cc engine might get the job done on a 100cc, 125cc, or 150cc motor, and some are developed to purpose in excess of a assortment of engine sizes. Other individuals having said that, will only work for a specific motor displacement. Usually check out the requirements to be positive of acquiring the accurate scooter ignition parts.
2-stroke and 4-stroke Scooter Ignition
The 2-stroke and 4-stroke engines are fully distinct, and as a outcome, their engines’ ignition timing is absolutely distinct as properly. You are unable to use a CDI designed for a 2-stroker on a 4-stroke scooter. Conversely, you are not able to use a 4-stroke scooter’s CDI on a 2-stroke scooter.
Connectors
On a lot of recent CDIs, the connectors are integral to the unit’s case, forming a plug that snaps right on to the scooter’s wiring harness. On other versions, the connectors may well be situated on wires, permitting some leeway on accurately where the module is mounted. The skillful mechanic may shorten or lengthen these wires as vital. The most typical CDI connector type makes use of two plugs facet by aspect one 4-pin plug, and a 2-pin plug. These connectors could be sq., rectangular, or uncomplicated spades.
Be aware: Photo illustrations of a lot of CDI connectors can be witnessed at the site stated at the base of this posting.
Unrestricted or Restricted?
An unrestricted (or racing) CDI supplies the present no make a difference how high the motor RPMs go. As the CDI controls the spark plug, the plug will carry on to fire at superior RPM. For factors that must be apparent, these CDI models are manufactured for racing use, and are not really suited for normal highway use. A limited CDI module nevertheless, will cease firing when a pre-established motor RPM is attained. Without current reaching the spark plug, the engine RPMs sluggish to underneath the pre-set limit and only then will the CDI resume delivering recent to the plug.
When changing a CDI module, or any other scooter ignition or electric powered scooter parts, it is normally a great notion to reference your owner’s handbook. If the manual is dropped or normally lacking, several companies and brand names have downloadable manuals offered on their internet websites.