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Discussion Starter #1
I have a 1995 425 with a Kawasaki 20 hp water cooled engine w/650 hrs. It runs fine for about 30 to 40 minutes then the left cylinder loses spark. I ran an inline spark checker to verify the spark loss. I assumed the coil was going bad or wire was going bad (they come as a unit). I replaced the coil and plug cap and still have the same problem although the spark is brighter. I cleaned the connections at the main circuit board and checked the fuses; all OK. The temperature guage always reads normal.
Once it loses spark it sometimes regains the spark for awhile but it eventually loses it. If I let it sit for an hour it usually has the spark when I restart it but after 30 or 40 minutes of cutting it stops.
Any suggestions?
 

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Sounds like the coil(AM105573) or ignitor(AM105574). I would start by swapping sides with the spark plugs. Just in case it is a bad plug.
 

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The first thing I did was replace both spark plugs and since I've already replaced the coil the igniter sounds like it is the problem. I've seen other electronic modules that go crazy but don't permanently fail under heat conditions.

Thanks for the input.
 

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OK, not trying to derail this thread, but it reminds me of a story, with a moral. It is related, so bear with me.

Back in the early 80's I had a 1976 Corvette that was my daily driver. One day on the way home from work it died. A very good parts guy assured me that it was the module in the distributor that had gone bad and sold me a replacement. After replacement I still had a broken Corvette and no transportation. I spent a week hunting for the failed part. In the end it turns out that the new module was as bad as the old one. Moral and I am not saying this is your situation, but the new parts can be defect as well. Something you want to keep in the back of your mind if you are running out of options. Those electrical parts just PITA to me. :gaah:
 

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Yup, gotta agree. Saw it more than once in my former pro motorcycle mechanic days...

OK, not trying to derail this thread, but it reminds me of a story, with a moral. It is related, so bear with me.

Back in the early 80's I had a 1976 Corvette that was my daily driver. One day on the way home from work it died. A very good parts guy assured me that it was the module in the distributor that had gone bad and sold me a replacement. After replacement I still had a broken Corvette and no transportation. I spent a week hunting for the failed part. In the end it turns out that the new module was as bad as the old one. Moral and I am not saying this is your situation, but the new parts can be defect as well. Something you want to keep in the back of your mind if you are running out of options. Those electrical parts just PITA to me. :gaah:
 

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Sad but true with electrical. New does not insure good.:thumbsdown:
 

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Discussion Starter #7
Additional testing points towards the ignitor module.

I have new plugs and the problem appeared before and after I put the new plugs in. I swapped the coils and the problem is still the left side cylinder. I found an ignitor replacement online at JEGS.com for $84.99 but it is on backorder and is not expected to be in stock until late August. From what I can tell it can only be the ignitor module or the stator which has an individual feed for the left coil and one for right coil. Did I miss anything guys?
 

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Problem solved!

I got an ignitor on ebay and that completely solved my problem. JEGS had the part on backorder and said the part should be in stock by September. So I had to pay $140 on ebay for the module because I couldn't wait til the end of summer to cut my grass. JEGS.com has the exact part for $85.

Here are the part numbers:
John Deere AM105574
Denso 131800-0131
Kawasaki 21119-2157
JEGS 313-31800-0131
 

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Denso/Kawasaki

Zardoz
Would you be interested in getting rid of the old Denso module? I am trying to setup and repair these modules and would like to acquire some broken ones.
Let me know.
thanks
John
 
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