hello I have a gy6 motor & I have wired the cdi with 12 volts ( dc).. I think it was maybe a ac powered cdi before... I do not have the black & red tracer wire from the stator.. it was changed.. there is about 80 ( ac reading ) COMING FROM IT.. BUT IT DOES NOT REV UP... when I put 12 volts from the battery .. it starts excellent and revs up .. like it should... is this ok to do this??? when I put it back to the power from the stator .... it starts ( sometimes ) and when it does... it will not rev upand sometimes it bogs out.. so I think leaving the 12 volts ( dc) is the way it is going to work ok.. can a person just put 12 volts to the cdi and have it work properly??

 

I'm not understanding your post. Here is what is confusing me:

and

You don't have the black/red wire from the stator (which is the CDI power wire), and then a couple sentences later you claim to wire the CDI back to power from the stator (which you just said you don't have).

You also claim to measure 80 volts AC. Exactly where are you measuring this? And at what speed? Idle? cranking? High Speed?

If indeed you are really connecting the power back up to the stator, and you really don't have a black/red wire on the stator, then where exactly are you hooking the CDI power up?

DC powered CDIs run on 12 volts DC. AC CDI's run on 35 to 80 volts AC at cranking speeds. At engine running speeds the AC voltage powering CDI is substantialy higher. They are *not* interchangable. Often the CDI is instantly destroyed when plugged into the opposite power scheme.

 

I've been fighting a 250cc buggy with no spark, ordered new stator & cdi from Kazuma...of course you have to go by description & pictures to find your part....new stator came in different from the picture...NO source coil, no red wire. can this be converted to 12volt by using a different cdi ? I have several cdi's in stock but hate to roast them for no reason.

 

By "source coil" I assume you mean the moderately high voltage AC ignition power windings in the stator? If so how many coils are on your new stator? How many coils were on your old stator (including the "source" ignition power coil[s])? The number of coils must match exactly because they must also match the number of magnets embedded in the flywheel. If they don't match your battery charging system will not work.

If your old and new stator have the same number of coils then you can rewire you quad to run on DC (I'm assuming you have a 6 pin CDI - 2 pin and four pin?). If so just take the AC ignition power pin off the CDI, and run a new wire to fused, ignition switched 12 volts DC. Then plug in your DC CDI.

That will allow the CDI to make spark. I'm not 100% sure all DC powered CDIs respond to the kill switch input pin. If it does the rest of your existing wiring should work. If you cannot shut off the quad we'll have to make another minor change. But we're getting too far ahead...

The first thing is to count the coils on the new and old stators. Can you post up a link of the stator you bought, and (if you have one) a link (or picture) of the your old stator?

 

same # of coils, the source coils have 147 ohms resistance, but I dont know what reading I should get from them. stator will bolt up & fit flywheel but no ac power to cdi

 

I still am not sure what you're reffering to when you say "source" coil. 149 ohms sound wrong for the AC ignition power wire. I would expect that this wire should measure more like 400 ohms.

AC powered stator have three separate coil systems in them:

1) The CDI trigger pickup coil (small mounted outside the flywheel)
2) The battery charge coils (usually consists of multiple coils wired together)
3) The AC ignition power coil (one or sometimes two coils wired together)

On DC only stators winding three is missing.

250cc stators come in many flavors. Is your stator 3 phase or single phase? In other words do you have three yellow wires going to the voltage regulator, or two yellows (or sometimes a yellow and a white wire)?

How many coils on your stator? Six? Eight?, Nine? Eleven? Seventeen? Eighteen? Count the igntition power coils too, but dount count the trigger pickup coil.

Three phase is most common on 250cc machines. On three phase stators the battery charge coils (excluding AC Ignitiion Power winding(2)) are alway divisable by 3.

Can you find a link for the stator you bought and post it? I want to see if your stator has an AC Ignition Power winding on it...