50ccc CDI AC OR DC GY6 MOTOR REFRESH By Tawas (Read 8,343 times)

[Tawas]

HI GUYS I need to refresh my memory on my scoot 50cc gy6 to my CDI BOX one plug has three the other has 2 that a a/c CDI... and a dc/ has 3 in one plug and only one out the other right... please let me know thanks to all

[Bashan]

You're basically right but there's new variations showing up. Knowing how these things work is the best way to determine an AC or DC CDI. The AC gets it's power from the stator via a (usually) red/black wire into the two plug. There will usually be a white/black in the two plug with the AC CDI which is the killwire. The DC CDI gets it's juice from the battery so you'll see just one black wire in the two plug. There's usually no killwire because it shuts off with the key. However, we've had some guys report that they have a black/white killwire in the two plug on their DC CDI. The four plug isn't going to tell you a whole lot because you can have one or two grounds. Then you have to have a coil feed and trigger wire regardless of AC or DC power. You can actually test to see if you have a DC or AC CDI. Set your multimeter to DC voltage and slide the red probe carefully against the power feed wire:

Ground the black probe and turn on the key. If you see 12v DC on the meter you have a DC CDI. We had a guy confirm not too long ago that he had a black wire into the power slot and no killwire yet it turned out to be an AC CDI. With some testing he determined that the black wire was an AC feed from the stator and the bike killed through the trigger wire. This is a rare configuration but it illustrates what I've said many times, the only constant with Chinese scooters is there's no constant. Here's a tutorial on AC DC CDIs that's in the electrical section of the Library. You guys DO look in the Library sometimes don't you? Rich

[Tawas]

Thanks Rich very helpfull you helped me once again thanks