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Bayou 400 no spark, no 12v at ignition coil

Ailll1

By Ailll1
in Kawasaki ATV Forum

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Ailll1 Newbie

Ailll1

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I’m working on a Kawasaki Bayou KLF400 for a family member that doesn’t have spark. I’ve already replace the ignition switch and the stator which were defective. The stator had a melted connector and one of the phase had low resistance and low VAC output. 

What I’ve figured out so far is that I’m not getting 12V to the ignition coil when I turn the key to the ON position. From what I understand, the 12V should come from the CDI. I’ve resistance tested both wires going from the CDI to the ignition coil (Green/white and black/yellow). They are fine. The only 12V coming from the ECU is on the yellow/red wire.

I don’t have the wiring diagram for the 400 but I’m working with the one for the Bayou 300 which looks pretty similar except for the wire color between the CDI and ignition coil. On the 300 diagram, the yellow/red wire goes to the ignition coil, not the black/yellow… All the other wires color match except for this one. Not sure if that’s normal?

Thanks!

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Ailll1 Newbie

Ailll1

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Alright so wiring is correct.

So that means I should get 12VDC from the green/white wire coming out of the ignitor? I don't. Would that point to the igniter being the probrem? There 12V coming into the igniter from the ignition switch (yellow/red wire)
 

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Tom Bauer Rookie

Tom Bauer

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No, definitely not. There is no measurable voltage to coil on a CDI system and you can damage things by trying to test stuff incorrectly. A CDI cannot be tested by most people. By this I mean you need a very exclusive CDI tester, There are probably just a handful in the world. Use the service manual to measure the resistance of parts that feed the CDI, in this case it is only the pickup coil, if they are good, CDI is bad.

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  • 6 months later...
Goingforbroke250 Rookie

Goingforbroke250

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Hate to question you Tom, but I’ve been reading thread after thread on this issue, and everyone is saying there should be 12v on the green/white wire. 
  I’ve got a single spark issue. It sparks when I have 12v on the green wire, but doesn’t when I lose the 12 volts, but it comes back if left disconnected for 5-10 seconds. Checked every ground, jumped things out, hate replacing parts because it doesn’t seem to have helped anybody except one I’ve read about. 
  Regarding that wiring diagram above, could someone post something more complete? 2nd post. Gonna be hard to hit 10 posts any time soon without spamming something with pointless messages... 

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IzzieGirl Newbie

IzzieGirl

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 so I just got a95 klf400. Same issue. The guy had replaced stator coil and CDI. We did continuity tests on the starting/charging system, and found that in the wiring harness, on the frame below the seat, there's a crimped connection with 3 wires splicing into 1. One of the wires was loose, and therefore not getting a good connection. A lot of frustration on my part, a very patient husband, and dab of solder later she fired right up. My hubby also found this problem in several places on his uncle's Yamaha. 

Edited by IzzieGirl
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Savage3 Enthusiast

Savage3

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Ok, so the G/W wire goes to primary side of coil. Answer to the original post is.....yes. Once again, I would check for continuity between the two ground pins and the other 4 pins to verify short in CDI  before replacement. 

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Savage3 Enthusiast

Savage3

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Remember,  as Tom specified, a regular dvom cannot detect insulation breakdown under high voltage.

The test I recommended only identifies a short within CDI.

Basically,  if you have power at yellow and red and your coil has specified resistance (listed in manual) THE CDI is bad. 

In short, if components on either side of CDI are good and no spark,  CDI is at fault.

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MarkinAR Experienced

MarkinAR

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Love the intelligent banter above on CDI's.  For a simpleton like me, I'll distill it down:  If everything else tests good, it's a bad CDI.  There's no at home test for an average DIY guy like me to conclusively test a CDI....so all things ruled out, it only leaves one option. :)

Occam's Razor, if you will.

Edited by MarkinAR
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Goingforbroke250 Rookie

Goingforbroke250

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On 6/6/2021 at 11:16 AM, Savage3 said:

The CDI can be tested for a short by checking continuity between the 2 ground pins (if it is a 6 prong) and the other pins. 

If you have continuity, the coil in CDI has a short.

Also, check the trigger coil, both of you....

What voltage should be coming out of each leg of the stator? Also what kind of reading should I be getting from the pickup coil as I rotate the engine??

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  • 7 months later...
Savage Newbie

Savage

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On 6/10/2021 at 2:19 AM, Goingforbroke250 said:

What voltage should be coming out of each leg of the stator? Also what kind of reading should I be getting from the pickup coil as I rotate the engine??

Please post your measurements,  all three legs of stator as well as trigger coil.

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Savage Newbie

Savage

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On 6/7/2021 at 10:52 AM, MarkinAR said:

Love the intelligent banter above on CDI's.  For a simpleton like me, I'll distill it down:  If everything else tests good, it's a bad CDI.  There's no at home test for an average DIY guy like me to conclusively test a CDI....so all things ruled out, it only leaves one option. :)

Occam's Razor, if you will.

Great deduction Mark. If a DYI doesn't have the proper test equipment, then rule out everything on both sides of cdi.

Main point, resistance testing is not conclusive for several reasons when testing a CDI.

End result,  if the proper testing is not performed on either side of the CDI, then you wasted your money on new CDI and the initial problem continues. 

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Goingforbroke250 Rookie

Goingforbroke250

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12 hours ago, 98Bayou400 said:

I have very similar problems— did you get it repaired?

Good luck — mine had hot wire on CDI connection melted 😳

Mine had a faulty cdi. Bought a cheap knockoff from eBay that did work, but I had to re pin it.

5 hours ago, Savage said:

In addition,  please post the resistance readings across all three legs of the stator along with the results of testing stator to ground.

I have no idea what my reading were, as it was 6 months ago, and the quad has gone home to be used as it should. 

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