Electrical Scooter Components – Changing a CDI Module

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One of the widespread of electrical scooter elements in want of substitute, the CDI module is as important to the scooter ignition system because the spark plug. Regarded as an invention of the good Nikola Tesla, the Capacitor Discharge Ignition (CDI) is the usual system used on most of at present’s gas-powered motor scooters, in addition to on many bikes, marine outboards and different small engines. An entire CDI module is made up of a transformer, the charging circuit, the rectifier, a capacitor, and the set off circuit.

How the CDI Module Works

The transformer first raises the voltage to 400 to 600 volts. Shifting alongside the charging circuit, the electrical present prices the capacitor, with the rectifier stopping the capacitor from discharging earlier than the ignition level. Receiving the triggering sign, the set off circuit stops charging and permits the capacitor to discharge to the low inductance ignition coil. This will increase the unique 400-600 Volt capacitor discharge to as a lot as 40 kV on the secondary winding, leaping the spark plug hole, and igniting the fuel/air combination within the cylinder. The charging circuit is then reconnected and resumes charging the capacitor over again.

AC or DC?

Most present scooters us an alternating present (AC) system; nonetheless the favored KYMCO scooter model makes use of direct present (DC). In consequence, electrical scooter elements for KYMCO machines, together with the CDI module, can typically be troublesome to seek out.

Engine Dimension

It’s at all times greatest to match the engine dimension to the CDI specs. A CDI module made for a 50cc engine may work on a 100cc, 125cc, or 150cc engine, and a few are designed to operate over a spread of engine sizes. Others nonetheless, will solely work for a specific engine displacement. All the time test the specs to make certain of getting the right scooter ignition elements.

2-stroke and 4-stroke Scooter Ignition

The two-stroke and 4-stroke engines are utterly completely different, and in consequence, their engines’ ignition timing is completely completely different as properly. You can not use a CDI made for a 2-stroker on a 4-stroke scooter. Conversely, you can not use a 4-stroke scooter’s CDI on a 2-stroke scooter.

Connectors

On many present CDIs, the connectors are integral to the unit’s case, forming a plug that snaps instantly on to the scooter’s wiring harness. On different fashions, the connectors could also be situated on wires, permitting some leeway on precisely the place the module is mounted. The skillful mechanic could shorten or lengthen these wires as needed. The most typical CDI connector type makes use of two plugs facet by facet; one 4-pin plug, and a 2-pin plug. These connectors could also be sq., rectangular, or easy spades.

Notice: Photograph illustrations of many CDI connectors may be seen on the web site listed on the backside of this text.

Unrestricted or Restricted?

An unrestricted (or racing) CDI gives the present irrespective of how excessive the engine RPMs go. Because the CDI controls the spark plug, the plug will proceed to fireplace at excessive RPM. For causes that must be apparent, these CDI models are made for racing use, and usually are not very appropriate for normal freeway use. A restricted CDI module nonetheless, will cease firing as soon as a pre-set engine RPM is attained. With out present reaching the spark plug, the engine RPMs gradual to under the pre-set restrict and solely then will the CDI resume offering present to the plug.

When changing a CDI module, or another scooter ignition or electrical scooter elements, it’s at all times a good suggestion to reference your proprietor’s guide. If the guide is misplaced or in any other case lacking, many producers and types have downloadable manuals obtainable on their web sites.

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Source by Andre Easter