2) According to the original factory specifications

For Piaggio Liberty Delivery/Elle/MOC 125 2007-2010

it does not need to distinguish the polarity of electrodes

Yamaha 1UY-81800-51

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CDI Box Unit ECU For Yamaha Banshee 350 YFZ350 ATV 1987 1988 89 90 91 92 93 1994 Generic Argo 2) According to the originalCDI Box Unit ECU For Yamaha Banshee 350 YFZ350 1987 1994 Features CDI box igniter, a device that provides sufficient energy to ignite pulverized coal, oil fuel and stabilize the flame in a flash. Great replacement for your old ones,high quality with long lifespan. Equipped with several connectors, just plug and play,low heat, low power consumption. Made of plastic material to ensure maximum strength and durability for long lasting usage. Description