AC CDI / Connector: 5 Pins male plug/ CDI Dimension: 70mm x 36mm x 29mm (L x W x H).Type: Motorcycle Ignition / Fits GY6 50cc – 70cc 90cc 110cc 125cc 150cc Scooter 4-Stroke horizontal enginesNote: This is AC CDI, that is SMALLER than the DC CDIEasy to install, hooked up easy, and 100% Match & Much More Responsive and Revs HigherSpecificationsTypeAC Fired CDIPins5 Pins Male PlugMaterial TypePlastic and MetalModel50-125cc Chinese import 4-stroke Pit / Dirt bikes & quadsMechanics 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 SizeIn 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