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Difference of AC CDI & DC CDI
- AC CDI: The CDI Obtains it voltage solely form the current produced by the stator and is one of the most widely used basic in small engines
- AC CDI : on the two plug part of the unit will always have 2 wire generally a black/red=stator power a white/black = engine kill
- AC CDI ：scooter engine will run without a battery or on a dead battery
- DC CDI: The DC CDI module is powered by the battery so an additional DC/AC inverter circuit is needed in the module to step up the voltage from 12VDC to a range 400-600VDC
- DC CDI: Is a lager unit due to the additional circuit and engine running with a DC-CDI set-up have a more precise timing and generally start better when the engine is cold.
- DC CDI: on most scooter is a 4 wire set-up but has been known a 5 wire set-up also, the sure way to know is to check its power source.
Mechanics Note on distinguishing AC fired or DC fired CDI box :
Wire and Plug
- In the GY6 6-plug set-up, you have AC if you have 3-wires going into the 4-plug side and you have 2-wires going into the 2-plug side.
- On the other hand, you have DC if you have the larger CDI box, 3 or 4 wires going into the 4-plug side and only 1 wire going into the 2-plug side.
AC And DC Size
- In general, the DC CDI's tend to be larger in size than the AC ones.
Headlights
- if the headlights turn on without the engine running, (with just the key on), it is a DC system.
- In the AC system the headlight requires the engine to be running. Another indication is, if the engine will only run with a battery it is DC. If it will run without a battery, it is a AC system.
Robert Mcguire
Reviewed in the United States on August 22, 2024
5 pin cdi was compatible with my 2018 coolster 110cc dirt bike. Performed as it was supposed to
Michael Harvey
Reviewed in the United States on July 17, 2024
Arrived early....perfect fit...works good...I recommend this seller!!
James E.
Reviewed in the United States on June 12, 2024
The cost is what I likes
Meyhem
Reviewed in the United States on February 6, 2024
I have had no issues with it.pit bike fires right up when I plugged it in, and is still running been 3 months
GK
Reviewed in the United States on February 25, 2024
I like that it fit my CT70 Clone perfectly, came quickly and with intelligible instructions on how to connect it to the machine and what it does.
Customer
Reviewed in the United States on April 16, 2024
Was the right part at the right price ..the biggest thing I like about Amazon is that you can find a part that is needed ..and they have it ..9 times out of ten
Mark S.
Reviewed in the United States on July 18, 2023
Purchased this for my Coolster 120cc Pit Bike, works vey well, direct replacement with better performance.
Barry mance
Reviewed in the United States on December 26, 2023
Item arrived on time and works great
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