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Originally Posted by makenzie71
...find one that has it's own power supply...you'll know because it'll have a red wire hanging from the body and not going to a plug.
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Chinese called the extra red wire one as "DC-CDI" . Spark from "DC" unit are stronger. It's the "de facto" choice for chinese bike repair shop (Rotor: weak magnetic field/ Source Coil F***ed winding etc ).
The curve from a reputable brand's DC unit:
http://item.taobao.com/item.htm?id=1679629088