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Probably the most widespread of electrical scooter components 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 sensible Nikola Tesla, the Capacitor Discharge Ignition (CDI) is the usual system used on most of right now’s gas-powered motor scooters, in addition to on many bikes, marine outboards and different small engines. A whole 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 gasoline/air combination within the cylinder. The charging circuit is then reconnected and resumes charging the capacitor yet 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 components for KYMCO machines, together with the CDI module, can generally be tough to seek out.
Engine Measurement
It’s at all times finest to match the engine measurement 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 perform over a spread of engine sizes. Others nonetheless, will solely work for a selected engine displacement. All the time examine the specs to make sure of getting the proper scooter ignition components.
2-stroke and 4-stroke Scooter Ignition
The two-stroke and 4-stroke engines are fully completely different, and in consequence, their engines’ ignition timing is completely completely different as nicely. You can’t use a CDI made for a 2-stroker on a 4-stroke scooter. Conversely, you can’t 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 straight 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 might shorten or lengthen these wires as crucial. 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.
Observe: 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 supplies the present irrespective of how excessive the engine RPMs go. Because the CDI controls the spark plug, the plug will proceed to fireside at excessive RPM. For causes that ought to be apparent, these CDI models are made for racing use, and will not be 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 some other scooter ignition or electrical scooter components, it’s at all times a good suggestion to reference your proprietor’s handbook. If the handbook is misplaced or in any other case lacking, many producers and types have downloadable manuals accessible on their web sites.
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BY by GAHZLY
#Electrical #Scooter #Elements #Changing #CDI #Module
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