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Open Roads Forum  >  Tech Issues

 > No spark to Kohler 5kcm21Generator

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Gjac

Milford, CT

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Posted: 07/28/12 12:31pm Link  |  Quote  |  Print  |  Notify Moderator

det62 when you said that you replaced coil wire and it fixed the problem was that the small 12v wire connecting to the coil with a flat connector? I finally removed most of the shrouding to access the coil. I have 12.5v at positive connection at generator(looks like a black Bakelite solenoid where + and - come into the gen-set from the house batteries) but only read 12.2v to small wire going to the coil. This is measured from + connection to small wire to coil. When I checked from small wire to generator ground I got 0 v. So I don't know if this is good or bad.

det62

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Posted: 07/28/12 01:12pm Link  |  Quote  |  Print  |  Notify Moderator

The wires that were replaced were the ones running to both plugs..the generator was only running off of one plug..even though both plugs were good.


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Gale Hawkins

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Posted: 07/28/12 10:11pm Link  |  Quote  |  Print  |  Notify Moderator

I have never touch our plugs/wires but I think both plugs fire on every stroke but nothing happens since there is not fuel there on the exhaust stroke.

Gjac

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Posted: 07/29/12 08:12am Link  |  Quote  |  Print  |  Notify Moderator

I think I finally figured out how this this works. The small 12v wire going to the coil does not supply input voltage like a car coil but acts as a kill switch. I tried cranking this over with the wire removed but still no spark. The voltage actually comes from the magneto and energizes the coil to produce spark. If I understand it correctly the gap between the coil and magneto .012, the coil itself, the control board, or the circuitry between the board could be the problem of no spark. I measured the resistance between spark plug wires at got 26,000 ohms. The manually does not say what is good. Does any one know or have an educated guess?

garry1p

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Posted: 07/30/12 03:05pm Link  |  Quote  |  Print  |  Notify Moderator

Here is a site for Kohler parts and they can rebuild your controller board for a fraction of the price and I think the also offer on line tech support.

generator repair


Garry1p


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Gjac

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Posted: 07/31/12 02:27pm Link  |  Quote  |  Print  |  Notify Moderator

I think I got to the bottom of this and determined that the coil was bad and ordered a new one from Amazon.com. Every web site I saw said the ohm reading between wires was suppose to be between 5,000 and 10,000 ohms mine read 26,000 and had no spark when I cranked the eng. Hope to get it 5 days and try it out. Thanks for everyone's input.

det62

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Posted: 07/31/12 03:39pm Link  |  Quote  |  Print  |  Notify Moderator

I hope the coil does the trick !!!

Gale Hawkins

Murray, KY

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Posted: 07/31/12 09:34pm Link  |  Quote  |  Print  |  Notify Moderator

Hope the coil is the fix. I have the same generator and at 20 I know things can fail anytime. I think we are mid 600 hours now. Sea Foam usage over time stopped the carb loading up problem.

The after-run was so bad when we first got it in 2007 but after Sea Foam removed the carbon from the combustion chambers it dies smooth instead of trying to jerk off of its mounting brackets.

Gjac

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Posted: 08/01/12 04:15pm Link  |  Quote  |  Print  |  Notify Moderator

I hope its the coil also. Two guys that work on small engs told me to crank the eng and if there is no spark with the small wire removed then it is the coil. The coil comes with the two spark plug wires integral to the coil.

Gjac

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Posted: 08/04/12 07:03pm Link  |  Quote  |  Print  |  Notify Moderator

Well I got the coil today from Amazon. I am very disappointed after installing the new coil to find out that I still have no spark. I can't figure this thing out. I measured the ohms from the spade connection for the small wire to the lamination's and read 1.9 ohms my old coil was open. I am also reading .9 ohms from that same terminal to the top of the eng block (ground). I almost think that the new coil is also bad.

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