Lynn,

Thanks for the quck response.

I see no way of firing this CDI either. It's not driven from the camshaft. It is a 2 stroke. However, the black with the red wire & the white with the red come from a separate coil in the stator. I am thinking that this is the signal everytime a magnet goes by, the white/red feeds the signal, the black/red would ground it out killing the spark. Being a 2 stroke firing on the exhaust stroke would mean nothing.

I have these readings that you need but I will hook the harness back up & redo them. The harness is in tack & doesn't look to have been changed internally. I also think that the CDI I gave you a posting for may work.

Thank you again. I will send you these readings as soon as I can reassemble it & obtain them.

GOD is good all the time. Viet Nam vet Grampy

 

Yes, of course. I wasn't thinking when I wrote that .

Perhaps, but to get precise ignition timing usually requires a fast edge on the trigger voltage waveform so any noise on the waveform when it crosses through the CDI trigger threshold doesn't change the timing significantly. That means the magnet that causes the trigger has to have a north/south pole pair very close together to get the sharp transition. That doesn't fit the shape of the large/long magnets used in power generation (AC ignition power and battery charging power through the regulator). Right now I cannot see how any of the four internal coils in the stator could trigger the CDI accurately enough, but there are also many things I don't know. I haven't ever seen a quad like this one. Lets get the resistance measurements back and revisit all this after looking at the data...

I don't know about the CDI. Maybe. I did a couple searches on the machines that CDI was supposed to fit and didn't find any wiring diagrams, or ignition problem threads that looked similar to yours. It was another dead end. But the CDI is but one part in a series of parts that generate spark. So it makes sense to test the AC ignition power, kill switches, trigger voltage, ignition coil resistances, etc, to see if anything blatantly wrong sticks out. Changing out parts to new ones that may or may not be compatible might confuse the issue more - rather than solving it.

 

Lynn,

In reference to your questions about my wiring harness, with the ignition on & the tether & kill switch in the run (open) position. These measurements are at the CDI wiring harness connector.

The resistance between the white/red & the black wire reads open.
The resistance between the red/black & the black wire reads open.
There is no tan or orange wire going to the CDI from my wiring harness.
The resistance from the spark plug wire to the black (ground) wire is 6.51ohms.

The fourth wire from my CDI which is the tan(orange) wire I think hooks to the tan(orange) on the coil. The only theory that I can come up with is that this CDI is fired four times a revolution. One of the 4 coils in the stator has a white/red wire on one end & a red/black wire on the other. There are 4 magnets on the fly wheel. Everytime a magnet passes this coil I would get a firing voltage which would be 4 times a revolution. The other 3 coils are just seriesed with different taps for different voltages. I absolutely find no other way of firing this CDI. The 12 volt dc does not go to the CDI plug. I can only follow it to the starter system which is no longer used. I hope this helps.

Thanks again for all of your time & trouble.

GOD is good all the time.

grampy

P.S. The CDI that I sent you the link for on eBay is no longer available. I tried to purchase it & the seller replied that they were no longer available & that the bin was mismarked.

 

Sorry for the delay in responding - I've been working some long hours.

Having no connection from the red/black and white/red seems wrong to me. Before you reported that these two wires fed each end of a coil in the stator. That would work to get AC power over to the CDI if both wires went there (which they do), but then there are no pins left over for a trigger signal.

Looking at the shape of the magnets on the flywheel I don't see how any trigger waveform could come from these. The north and south poles are too far apart to make a sharp transition for an accurate timing signal.

Firing four times per revolution doesn't seem likely to me. Besides firing near TDC the ignition would be firing part way up the compression stroke too. I don't think that would not work.

I'm stumped...