Stator and CDI wiring By epdowd (Read 11,175 times)

[Bashan]

Jul 25, 2014 12:01:54 GMT -6 epdowd said:

Before I take off the front panel to get to the Rectifier and Key switch is there any reason I should read 20 ohms to ground on the green wire with key on.. Key OFF = 3 ohms. Key ON = 20 ohms. ? Thanks.

What green wire Harv?

[epdowd]

Thanks for the replies !!. I'll try the black white wire vs. spark tomorrow. Nope, no kill wire on the kickstand.
Green wire that goes to all the components I mentioned, Ground Wire.. Thanks for the help..

[Bashan]

OK Harv, I'd like you to try a few things just to sort your config out. Excuse me for being redundant but let me just work through this. Do you have continuity capabilities on your meter? If not just set for low ohms like 100  or even 200. First, let's test the ground on the CDI and make sure it's patent and then we can use it as a ground. Find a good clean frame ground and test the ground port to ground for continuity:

If that ground through the ignition is what you were concerned about 20 ohms is not a significant finding. Going through a switch can cause that much resistance. The continuity tone on a meter doesn't cut off until over 60 ohms so lets just table that for now.

Let's see what your kill function is doing. That black/white on your CDI may be the trigger and the kill at the same time! So set up like this and test with key on and key off, make sure kill switch is set to run. By the way this is your actual CDI:

If you got what's on my meter in that diagram your CDI kills through the key by grounding the trigger. That could be part of your spark problem. Now turn your kill switch to stop and do the same two tests and see what you get. If you can do those and tell me what you find we can zero in on this tomorrow. Rich

[epdowd]

Good Ground from frame to Green wire at CDI. Test at CDI bk/wt wire and gn wire:
Kill sw. on Stop Key OFF = .9 ohms key ON = Open
Kill sw. RUN " " = .9 ohms " " = 107 ohms

[Bashan]

OK, I got all that thanks. Please bear with me there's just a few more steps in this process Harv. Now REMOVE the four plug AND the two plug from the CDI...test the following:
1. kill on RUN: test ohms, black/white to ground key off and key on
2. kill on STOP: test ohms, black/white to ground key off and key on
2. kill on RUN: test ohms, yellow/black to ground key off and key on
3. kill on STOP: test ohms, yellow/black to ground key off and key on
4. kill on RUN: test DC VOLTAGE black in two plug to ground key on and key off
5. kill on STOP: test DC VOLTAGE black in two plug to ground key on and key off

At this point we are ruling in or out your ignition switch and the kill switch. Hang tough, this won't take much longer. I know my methods are a little redundant and circuitous but it's kind of self checking as you go. There is a method to the madness. Rich

[epdowd]

I'll get on it tomorrow and Rich, I thank you for all this help, Big Time !!. Harv.

[Bashan]

Here's what I'm thinking at this point Harv,
1. The kill switch is bad and grounding out the trigger wire OR
2. The key switch is bad grounding out the trigger wire OR
3. The trigger is bad OR
4. The coil isn't getting a feed OR
5. The key switch is bad and there's no 12v DC to the CDI to power it.

Did I mention that is your actual CDI?

[tvnacman]

with everything in the run position you should get infinate resistance on the black/white wire .

John

[epdowd]

Here are the readings.
1.Kill in RUN: Key Off = 0 ohms. ON = 272 ohms blk/wt wire
2. " " STOP: " " = 0 ohms. " = 490 ohms " 2. " " RUN: " " = 0 ohms. " = 112 ohms blk/y
3. " " STOP: " " = 0 ohms. " = 112 0hms "
4. " " RUN: " " = 0 Volts DC. ON = 12 Volts DC. blk wire 2 plug
5. " " STOP: " " = 0 " " " "
I measured these twice but if any don't sound right let me know and I'll do them again.
Thanks,, Harv.
When I did the post bit, the line info doesn't come out the way I typed it but I guess you can read it..

[tvnacman]

unplug your ignition switch , put the key switch in the on position check the resistance between green and black/white

John

[JR]

Ok I read all of this and I'm trying to understand about this CDI? If your reading are correct then all is OK and you DO NOT have a kill wire that grounds out the CDI which happens on some scooters. When you hit the off/on engine run switch you are cutting 12Vdc for the key switch thus killing the engine.

Why are you wondering about the CDI wiring, did you purchase a new CDI? What happened, scooter running one day and then just quit? A little more details please. What happened that you are questioning the wiring on your CDI?

It's simple on this CDI setup, you have to have 12Vdc on the black wire and a good ground on the green wire which you need to test. Lastly you need to check the pulse coil trigger wire for AC voltage while turning the engine over. These things we need to know.

JR

[epdowd]

JR. Thanks for the reply
I do have 12 v on the blk wire on the 2 plug when cranked.
I do have 2 vdc on the blu/wt pulse wire from stator to blk/wt at CDI 4 plug when cranked.
Green wire at cdi to ground Key OFF-ground o ohms Key ON= 300 ohms

I've had the scoot for three years bought it new. This started by the scoot just shutting off when I was riding it. I pushed it in a parking lot, looks to see if anything was obvious, tried starting and it did start. The next time it shut down about a half mile from home and would not start so I push it home, after checking things over is when I noticed no spark on the plug. I have spare coil, cdi and new plug that I swapped in, still no spark. Not really knowing what I was doing I guess so I replaced the stator, still no spark. I don't see how I could have put the stator in wrong because there are only two bolt holes to line up. I'm stuck.. Harv..

[Bashan]

Harv, JR and I think you might have a bad killswitch. Can you get the plastic off so we can look at it. Also, test your trigger wire for AC not DC. Rich

[JR]

If he has a solid 12Vd on the black wire to the CDI then it's not the kill switch or key switch. He needs to check the ground wire very well.

[epdowd]

It reads .3 vac when cranked.. I'll get to the kill switch shortly. Thank you guy's for all this help !!!
OK, I'll check all the ground wires..