Ac cdi?

[jdl357]

Ok, my cdi is big, and has only 1 wire in the 2 wire slot like a DC cdi. But the engine runs without the battery connected? So it has to be AC cdi- right???

[FrankenMech]

Did it start without the battery connected?

[jdl357]

It won't kick start with the battery disconnected.

[FrankenMech]

then it is probably a dc cdi. an ac cdi can be kick started without a battery.

a running engine produces dc even without a battery.

[jdl357]

Ok, thanks for the info. I guess the two I've tried are both ac cdi's. With them hooked up it'll crank over a few times then blow the fuse by the battery. I'll look for a DC one and see how it goes, thanks again!

[cagiva4ever]

most DC-cdi's have 4-pin's on connector block.

also the size varies, so "big size" isnt always absolute sign of dc-cdi.....

also, you can see if a strong Neondynom/earth magnet gets stuck on it. usually on the bottom RH-corner, from component side of the PCB. most china scooter DC-cdi's have a "transformer" on the pcb, it has iron core, hence strong magnet will get stuck onto it.

this magnet identification isnt always absolute Trick, as some dc-cdi's have some other component construction Layout.... like a "diode bridge"...

see how many Signs you can identify. and also check your Vehicle parts list/W.S.M and owners manual. cdi spec is absolute mentioned on some of those.

i have all of these parts my self, i have approx 40+ diff cdi's for China scooters etc china vehicles. and also european scooters/mopeds.

[FrankenMech]

One can always trace out the wiring to the CDI and see if it connects to the battery etc.