Description:

How to distinguish AC fired or DC fired CDI box 1. 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 2. In general, the DC CDIs tend to be larger in size than the AC ones. For example ,the common AC fired CDI box is length 66 x width 38 x height 23or length 58 x width 33 x height 23,but common DC fired CDI box is larger than AC fired cdi box in size ,such as length 75 x width 42 x height 23or length 96 x width 55 x height 24. 3. Another test is 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. Features: AC fired, 6-pin 2-plug rounded High Performance with No Rev-Limit CDI Dimension: 66mm x 38mm x 23mm(L x W x H). This CDI has a ignition module that has no rev limit and also has a single stage advanced timing circuit, this means that you can get a faster response to rpm acceleration and a higher rpm limit at top end if you use Used for GY6 50cc 125cc 150cc Scooter Moped ATV Go-kart 139QMB 152QMI 157QMJ Engines.