KZ 650-B2 Ignition Coil repeated failures.

I have recently burned through 3 ignition coils on the same side of the bike. it is equipped with a Dyma electronic ignition, and has correct wiring based on manufacturer instruction. The Coils are made by EMGO. I have tested the failed coils and have found them inoperative.
Battery voltage: 12.6,
voltage leading TO COILS: 10.4
#1/4 COIL WORKS, BUT #2/3 DIES.
I have checked the rest of the electrical system and have found that it is reading 12.6 volts, and no fuses are blowing.

Pleas if anyone could help I would greatly appreciate it

If you want photos, I can provide them, just let me know.

If spark plug wires are bad, spark can burn coil. Check resistance of wires with coil and separately.

You may want to (at least temporarily) go back to using points and see if you experience the same problem. My 1977 KZ650 stock coils have lasted 39 years with no problems; I use stock points. Ed

Are the coils made in CHINA?
Steve

Did you forget to use RTV?
My coil works fine.
2/3 coils should always be covered by gray RTV.
Use copper RTV for 1/4 coil. :evil:

Yea, I'm betting on Chinese coils. My 78 KZ650 with 168,000 miles still has original Kawasaki coils even using a Dyna system. I don't think the coils are generally a fragile item. If they were, I'm sure I would have burned mine out by now.

I have two sets of original coils and one set of Honda coils. They still work and none of them have RTV smeared all over them. nor would they ever be.
Steve

the wires are fused into the ignition coil. should I try new connectors, and grounding the coil?
Also the coils are made in Taiwan, and it voids the warranty if i put paste on the coil. The coils are not melting or getting hot, they just stop working

rsilva wrote: the wires are fused into the ignition coil. should I try new connectors, and grounding the coil?
Also the coils are made in Taiwan, and it voids the warranty if i put paste on the coil. The coils are not melting or getting hot, they just stop working

How were the failed coils tested?

Many stock coils have integrated plug wires permanently built into them as part of the coil assembly.

Coil mounting does not involve a ground. If suspended in mid-air, a serviceable coil will work just fine.

Assure good contact between each plug wire and its cap.
Could consider trimming ¼" off each plug wire to achieve better connections where the wire attaches to its cap.

Battery may be weak and still measure 12 volts.
Would have the battery load-tested after an overnight charge.
Load testing is usually a free service anywhere that sells batteries.

For testing purposes, it's okay to use jumper cables from an automobile battery so long as the automobile's engine isn't running.

Good Fortune!

rsilva wrote: it voids the warranty if i put paste on the coil.

it was a joke.
RTV is used to prevent cracks growing on old coils.

There is a resistor in diagram, is it installed?

10.4 volts leading to the coil sounds too low doesn't it guys?? Mine is 12.17 and 12.19 the last time I checked and my first Dyna coils lasted over 20 years before I decided to replace em.

Yes, bad connections or fried wires.
Steve