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Thread: Ignition problem. One spark ! Reply to Thread
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  Topic Review (Newest First)
02-16-2020 06:17 PM
miyami While this shows that there are differences in the CDIs, it also shows that all of them are not functioning, since I do not get the 100V minimum peak at the ignition coil. And to be sure for these tests, I disconnected all b/w (nanny wires) in the handle bar to guarantee the run/stop switch and the ignition switch are not at fault, and also grounded the green/white wire to exclude the side stand switch from being the culprit.


With this, I went through all the trouble shouting items in the rebel 250 official repair manual (page 16-3), and it points to a faulty CDI.


This leaves me puzzled. Unless all 3 CDIs are toast, or there is a special version needed for this bike, it stops making sense to me.



I am almost at the end of my wisdom and am thinking of bringing the bike to a Honda shop this week, unless somebody has some last advice.
02-16-2020 06:07 PM
miyami My original CDI - image 2: input from the exciter coil; image 1: output to the ignition coil
02-16-2020 06:06 PM
miyami With installed CDI I get this:
Red CDI (Argentinian, from Rick's motorcycle electric) - image 1: input from the exciter coil; image 2: output to the ignition coil
Chinese? CDI (cheap from ebay) - image 3: input from the exciter coil; image 4: output to the ignition coil
02-16-2020 06:01 PM
miyami Some more tests:
I did verify all connections in the harness. Everything looks good and is connected as it should. No groundings or open connections as far as I can see.

- I did pull the stator and it looks nice and clean (image 1). Not bad for a 29000 mile bike.

- I took a strong magnet and moved it in front of both exciter windings individually, and could see responses in the oscilloscope, so I assume the exciter coil is ok.
- I did some more measurements of the exciter coil and pulse coil after putting everything back together and it looks in spec (exciter coil: image 2 and 3, pulse coil: image 3; all with CDI not connected.
- Then I had a closer look again at the 3 CDI boxes I have. I installed the CDI one after the other and got some kind of weird readings.
02-14-2020 07:20 PM
miyami Sorry, SoakedKarma. I just saw your post right after posting my previous one....
02-14-2020 07:18 PM
miyami
Quote:
Originally Posted by bweighmaster View Post
Remove every component , clean all grounding contacts ... re install , run and check .... grounding of cdi , coil , stator , and pickup coil is most important ....

The wiring harness only shows one grounding point (top middle) that attaches to the Rectifier mount. Is this the only point where a cable is attached to the frame (ground) ? SoakedKarma's ignition system wiring has 2 Ground points.



Quote:
Originally Posted by SoakedKarma View Post
The wiring diagram at end of manual is for 85-87 1st generation Rebel and doesn't apply to your year bike..

One for the ignition coils, and one for the CDI - or is this just the diagram ?
02-13-2020 10:01 AM
SoakedKarma Green harness ground has 1 connection point, bolted to frame above and aft of spark plug coils..
02-12-2020 11:41 PM
miyami Are there any particular grounding points to look for other than the green wire at the CDI and at the ignition coils primary side ? I thought the rest is all grounded through chassis attachment screws (e.g. stator, spark plugs, etc.)?
02-11-2020 03:29 PM
bweighmaster Remove every component , clean all grounding contacts ... re install , run and check .... grounding of cdi , coil , stator , and pickup coil is most important ....
02-08-2020 09:01 PM
SoakedKarma danged if I know, anything is possible.
Very strange output signal though..
(GRN/WHT) = GND, BLK/WHT = open at CDI is correct in my book

below is a generic schematic of an AC Cdi to give you an idea what's inside
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