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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.
Michael Harvey
2025-08-13 16:40:19
Arrived early....perfect fit...works good...I recommend this seller!!
Robert Mcguire
2025-05-11 13:47:43
5 pin cdi was compatible with my 2018 coolster 110cc dirt bike. Performed as it was supposed to
James E.
2025-02-02 11:54:12
The cost is what I likes
GK
2025-01-24 12:59:56
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.
Barry mance
2025-01-12 13:39:51
Item arrived on time and works great
Customer
2025-01-04 21:34:30
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
Meyhem
2025-01-03 18:57:11
I have had no issues with it.pit bike fires right up when I plugged it in, and is still running been 3 months
Mark S.
2024-12-04 13:12:15
Purchased this for my Coolster 120cc Pit Bike, works vey well, direct replacement with better performance.
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