I have a baja 90 that i can not get spark I replaced the cdi and coil with no luck i removed the black and white kill wire and still nothing I think my bike has the ac 6 pin cdi any help would be appreciated

 

Is this a two stroke of four stroke engine? What model Baja? Do you know what year?

 

it is a 4 stroke and I think its around an 08 I will post volt an ohm readings soon

 

ok the trigger im geting 110.1 ohm .08 to .12v ac power .567ohm 67v is the lowest I have seen I pulled the stator to day it is clean and looks fine im out of ideas hope you can help

 

0.08 to 0.12 volts AC at cranking speed is a little low, but that could be your meter. Does the meter read 0.00 volts ac on the same scale and same setup when you're not cranking the engine? The reason I ask is that meters can be bad and have a offset - in other words they read voltage when none exists. By seeing a difference in your trigger voltage while cranking and not cranking verifies that the meter is seeing something that is real and repeatable.

DennyRoark recently posted a really great idea for using an old analog swing needle meter to look at the trigger voltage. It's a great idea. It may do a better job at discerning adequate trigger voltages. If you have access to one it's worth a try. Here is the link:

http://forums.atvconnection.com/chin...-no-spark.html

67 volts AC on the AC power pin at the CDI is fine. I assume the 0.567 ohm really means 0.567 Kohms (or 567 ohms, or 0.567 kilo ohms)

What about the rest of the tests? Your coil resistance? Coil voltage while cranking? Remember that we are trying to make our best shot using improper (but commonly available) equipment. Since we're at such a disadvantage we need as much info as possible. Then after chewing on all the data we make the best and informed choice we can of what to do next. This is better than stabbing in the dark.

Are you sure the replacement CDI you bought is really AC powered? AC and DC CDI's look identical, and if you install a DC CDI into an AC powered quad it's not going to work.

 

Does the meter read 0.00 volts ac on the same scale and same setup when you're not cranking the engine? it reads .001

Coil voltage while cranking? 37v ac 14vdc and it drops wile cranking
Your coil resistance? 9.45 k ohm ground to plug same from plug to power 0.2 ohm power to ground


Are you sure the replacement CDI you bought is really AC powered? AC and DC CDI's look identical, and if you install a DC CDI into an AC powered quad it's not going to work. I took my old cdi to the china atv shop in town and he sold me the new one it look identical

 

I'm a little puzzled by the coil voltage of 14 volts DC. If you really had 14 volts DC on the coil primary, and with a coil primary resistance of 0.2 ohms, that would mean you had 70 amps of current flowing through the coil (ohms law). Obviously this is not the case, so your meter must be really be messing up with the non-standard waveforms here.

You did take the coil voltage measurements with the coil and CDI both hooked up, right? You have to have both hooked hooked up to the wiring harness to get valid readings.

Also, when you measured the coil resistances, did you measure the primary winding resistance (the 0.2 ohm side) from the CDI connector coil output pin to the CDI connector ground pin? Or did you just measure the coil itself? By measuring the coil from the CDI connector in the wiring harness you are verifying the coil *and* the wiring. You could have a wiring problem, so measuring from the CDI connector is a better approach. Perhaps you've already done this, but I'm just trying to be thorough...

Assuming the coil was hooked up for the CDI output measurements then that means that the CDI is firing. That suggests that the trigger circuitry from the stator is working, and you have sufficient power voltage. And yet you still don't have spark.

Here's what I would do. I would do all the tests again, make sure they are reliable and repeatable, and then write down the results. Then put back in the old components you've changed out one by one. Then repeat the tests and write down the results. Look for changes in the results caused by changing out a part.

My thinking is this: If one of the replacement components you bought is also bad, then this could explain your confusing and frustrating results so far. Also keep in mind that *working* parts will work identically so your results will be the same after swapping, while failed parts have many failure modes, and are therefore unlikely to *not work* the same way. This is just a way of getting more clues, and then deciding where to go based on a whole lot of information.

 

ok so the atv has been sitting sense my last post I drug it out today put the old cdi back on and wow i have spark so i guess my question now is can some one tell me wether my cdi is ac or dc and what would a replacment part number would be ( the only number on the old one is XINZHV A0608) I think if i can find the right number im going to order a new cdi and pickup coil just to have here thanks a bunch

 

and just so yall know when it first quit running it would randomly die and be hard to restart then it got to a point where it just would not start thanks

 

See if the following procedure/picture applies to your quad:

If this is your CDI, then use the procedure to figure out what you have. If not we will have to back track a bit and regroup...