Exciter coil - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 6 Old 08-26-2013, 04:48 PM Thread Starter
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Exciter coil

which wire(R or W) sends the ac voltage to the CDI module? I'm guessing the red - but can't find it written anywhere....& I HAVE spent a lot of time looking.


I pulled the blk/wh wire outta the connector for the kill sw. trying to make sure it hadn't shorted to gnd during working on the starter sw. Wondered if I interrupted the ac input to the CDI. Doesn't look like it from the A9 diagram....

Last edited by Jim Sizemore; 08-26-2013 at 05:43 PM.
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post #2 of 6 Old 08-26-2013, 06:57 PM
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They BOTH go to the CDI; the RED, directly; the BLACK/WHITE through the ignition and the engine stop switches, where the conductor may be grounded to shut down the engine.

The exciter coil has two ends; when the magnets of the rotor spin past it, an alternating current is generated between these two ends. Both ends ultimately are connected to the CDI unit, where this voltage is stepped-up, rectified, and used to charge a capacitor. Each time the timing mass on the rotor passes by its pick-up coil, a voltage is induced into that coil's circuitry, firing a thyristor, discharging the capacitor into the primary windings of the ignition coil. The ignition coil transforms the capacitor voltage into thousands of volts, firing the spark plug.

That said, we're overly deep into your ignition problem, IMHO, Jim Sizemore!

Wasn't your ignition working before you began chasing these electrons to and fro?

If so, I'd again recommend examination and treatment on-hand by someone locally accessible with some knowledge of motorcycle electrics. Further exploratory surgery on your part may not produce a favorable outcome, may even be counter-productive. Yet, your bike, your call. With the unlimited possibilities, I feel frustrated in offering assistance. Wish I could be more helpful.
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post #3 of 6 Old 08-26-2013, 08:16 PM Thread Starter
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Every time you frustratedly reply to my question, Damocles, I learn something that I cannot find in the manuals on our bike. I don't know where you learned your insight to the klr - but I know where I am learning mine! What am I going to learn by having some parts changer in a shop make this thing run again??

I don't feel nearly as dumb about the bikes electrics as I did when I started. I really do appreciate all you guys biting your tongue and trying to help it make sense to me. I have repaired hundreds(maybe thousands) of complex electronics equipment(radio, crypto, electronic organs, etc) but this is myFIRST klr -and I Will repair it.(when I finally make sense of how it works) I maintain, one cannot repair something unless one knows how it works! How can I learn what is going from a WIRING DIAGRAM?? It just shows wires going to a box. I can only learn what goes on IN the box by asking!

If you do luck up and make it go again - you're in the same dumb boat as the last time it happened.

Thanks again fellas - the '98 klr WILL go again! Maybe someone ,other than me, is finding answers....OR maybe MORE questions?


Last edited by Jim Sizemore; 08-26-2013 at 08:21 PM.
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post #4 of 6 Old 08-26-2013, 08:49 PM
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My description of what goes on inside of the CDI is only ACADEMIC, Jim Sizemore!

You are POWERLESS to change or alter any of it.

You can only be responsible for the "goesinto" wires, e.g., are you getting AC from the exciter coil, are you getting a pulse from the pickup coil, do you have a required ground connection, etc.?

I understood you had a problem with your starter button. The starter circuit is rather separate from the ignition circuit. Both are separately illuminated in wiring diagrams in Clymer.

The Generation 1 KLR CDI, as mentioned, is AC-powered. Other CDIs may be DC-powered, but involve an INVERTER to convert DC to AC for the voltage step-up necessary; then rectify this higher voltage to charge a capacitor. Don't think you can do anything to service those DC-powered CDI black boxes, either!

Regardless, getting your bike back on the road will involveusing available wiring diagrams and a multi-meter, IMHO. If you suspect your CDI, a resistance chart appears in Clymer.
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post #5 of 6 Old 08-29-2013, 05:10 PM
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I think Damocles is really Dr. Emmett Brown, inventor of the Flux Capacitor....
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post #6 of 6 Old 08-29-2013, 08:46 PM
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Not the first time my TRUE IDENTITY has been questioned, chknman, since I joined this forum in January, 2011!

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