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  #1  
Old 07-05-2020, 04:42 PM
rsshallop rsshallop is offline
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Location: Minden, Ontario
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Default Spark plug problem
Has anyone ever heard of spark plugs consistently going bad after about one hour of run time? I have experienced this about three or four times in a row where I install a new spark plug (gaped to .035) on my newly rebuild k241a, run the engine, turn it off, come back to start it only to find that the plug will no longer spark. I thought that I may have been cracking the insulator while I am putting them in, although I am very careful doing it, torquing them in stages to 20 foot pounds. I have inspected them all and no cracks are visible on the insulator portion. One thing I do notice in a big way is the shock from the plug when I crank the engine and the plug not grounded. When I do that, a spark will come off the metal shell of the plug to the engine block, instead of between the electrodes.
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  #2  
Old 07-05-2020, 05:50 PM
R Bedell R Bedell is offline
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What plug are you using ??
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Old 07-05-2020, 06:05 PM
rsshallop rsshallop is offline
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So far, Ive gone through three Champion H10C plugs and one NGK B-6L
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  #4  
Old 07-05-2020, 07:03 PM
R Bedell R Bedell is offline
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I have used Autolites #216 for years and NEVER had an issue.

See link: Spark Plug Chart
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[B]Roland Bedell[/B]

CC Models: 100, 105, 1450, 782, (2) 784, & 2072

[SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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Old 07-05-2020, 07:22 PM
rsshallop rsshallop is offline
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I'll try the Autolite #216, but it would be good if I knew why the plugs are going bad. Unless I'm mistaken, the Champion H10C are a recommended plug for this engine. The issue with the plugs loosing the arc between the electrodes after very little use is screwy. I'm pretty sure something related to the ignition system must be causing this. Four factory defective plugs in a row is highly unlikely.
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  #6  
Old 07-05-2020, 08:04 PM
R Bedell R Bedell is offline
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What Ignition Coil are you running on this engine ...??

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[B]Roland Bedell[/B]

CC Models: 100, 105, 1450, 782, (2) 784, & 2072

[SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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Old 07-05-2020, 09:00 PM
rsshallop rsshallop is offline
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It's new. Probably made in china. I have the one that came with the 108 when I got it. I'm going to clean the ground from the negative post on the battery to the frame and also put the original coil back on. Then hopfully see better results.
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  #8  
Old 07-05-2020, 10:43 PM
Merk Merk is offline
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How old is spark plug wire?
How old is the gas?
What size carb are you running-26 or 30????
What does the spark plug electrode look like when it won't start?
Stock rebuild on engine?
New points and condenser?
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  #9  
Old 07-06-2020, 07:58 AM
R Bedell R Bedell is offline
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It sounds like you are using an aftermarket Ignition Coil. I would suggest that you use the coil, Kohler recommends.

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[B]Roland Bedell[/B]

CC Models: 100, 105, 1450, 782, (2) 784, & 2072

[SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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  #10  
Old 07-06-2020, 09:40 AM
rsshallop rsshallop is offline
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Hello Merk,
This is how I am running the engine now:

1) Plug wire : original
2) Gasoline: about 4 months old. 91 octane without ethanol
3) Carb size: I believe it's a 26, I would have to check though.
4) Spark plug electrodes: sooty. I'm probably running it too rich.
5) Rebuild: stock
6) Points and Condenser: the condenser is new, but I'm going with the points that came with the tractor for now.

I have a multimeter , so I'm going to test both the new coil and old coil to see if there are any differences. I will also check the resistance of the plug wire. I will report back a little later today with my findings.

Hello Roland,
Yes, I agree. Always better to use original parts when possible.
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