GY6 CDI Box
Item Description
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BE SURE TO CHECK YOUR BIKE TO SEE WHICH STYLE CDI BOX YOU NEED BEFORE MAKING YOUR SELECTION. WE HAVE AC ONLY, DC ONLY, AND AC W/ DC BACKUP CDI’s AVAILABLE. BE SURE TO SELECT THE CORRECT TYPE ABOVE. SEE BELOW FOR DETERMINING WHICH TYPE YOU NEED.
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Replaces stock CDI box
GY6 4 stroke engines only
Will not work on 2 stroke engines
50cc to 300cc
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· AC vs DC fired or pulsed CDI IGNITION SYSTEMS
Here is the guide to how a CDI works
In all cases there is a magnet that passes a magnetic coil and induces a pulse in that coil which then is wired to the CDI and causes the small induced pulse to fire an electronic device (there are more than 1 type but this all happens inside the CDI), which discharges the larger pulse stored in a capacitor. This larger output pulse is wired to the coil where the large pulse is able to make the coil function as a voltage increasing transformer, thereby producing the very high voltage necessary to create a spark across the gap of the spark plug.
Now for the 2 main types of CDI used in the 49 cc scooter market; AC and DC both function essentially the same. With the AC unit, alternating plus and minus varying voltages are used to charge the capacitor described in the paragraph above. The DC unit takes 12 volts DC from the battery and that voltage is used to charge the capacitor described in the paragraph above.
Pros and Cons:
AC units allow the engine to run without the need for a battery or charging system of any kind.
DC units were created to allow higher RPM ranges due to the instantaneous availability of the charging current.
Usually the wiring is different as well but not always. The AC units have a rectifier or diode ahead of the CDI and the DC units just connect directly to the battery.
The way to tell for sure is to turn on the key and see if 12v is present at the CDI.
Some units that are DC include:
Kymco Agility 50, Diamo Velocity, Vento Triton, Schwinn, Tomos, and other high end Chinese, Korean, and Taiwanese scooters.
One easy way to tell is the size of your CDI unit. The AC fired CDI will be much smaller than the DC fired CDI. Also, you have two plugs on the CDI, one with four pins, the other with two pins. If the two wire plug actually has only one wire in it, it's a DC. If it has two wires in it, it is an AC. The number of wires is only a loose guide. The size of the box, along with the number of wires is a better determination. An AC box will be smaller and will measure about 1-1/2 by 2-1/2 approximately. The DC box will be much larger as it has a DC-DC converter in it. Such words as AC or DC pulsed or AC or DC triggered are the same thing as the AC or DC fired units.
One quick warning on performance units, with the advanced angle of our CDI's your engine may actually run worse if it's not running right or is carbureted too lean. I'd recommend installing a larger main jet to take full advantage of these units.
Here is a somewhat simplified checklist to determine type:
Headlights turn on with key - DC.
Headlights turn on with engine - AC
Engine does not run without battery, - DC.
Engine runs without battery - AC
CDI box is relatively large - DC.
CDI box is smaller - AC (note: our new digital DC units are smaller)
There is one wire on the two part plug - DC.
There are two wires on the two part plug - AC.
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