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#3141710 - 10/01/13 04:33 PM One spark plug carbon fouled??
callbay Offline


Registered: 05/29/05
Posts: 655
Loc: Ozark Mountains
20 HP Kohler V twin. Engine was missing so I put in new plugs. The exact Champions the manual called for. One of the old ones was carbon fouled. The other one normal. It ran well with the new plugs for a few minutes but then fouled the plug again and started to miss again.

The welder/generator has about 1,200 hours on it.

Any ideas?? Thanks!

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#3141741 - 10/01/13 05:09 PM Re: One spark plug carbon fouled?? [Re: callbay]
nitehawk55 Offline


Registered: 04/01/10
Posts: 1064
Loc: Ontario , Canada
It's running rich for some reason . Is the air filter OK ? , if it is I would suspect an issue with the carb which is likely if it's been sitting for a time unused . It may also be possible the coil to that plug is weak and misfiring .

I have the same engine in my New Holland/Toro lawn tractor and it's been fine with plugs .
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#3141749 - 10/01/13 05:17 PM Re: One spark plug carbon fouled?? [Re: callbay]
callbay Offline


Registered: 05/29/05
Posts: 655
Loc: Ozark Mountains
It has a brand new air filter and prefilter.

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#3141879 - 10/01/13 07:36 PM Re: One spark plug carbon fouled?? [Re: callbay]
Zaedock Offline


Registered: 09/10/05
Posts: 3857
Loc: Massachusetts
Kohler V twin - check the head gasket on that cylinder.
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2012 F150 Ex-cab 5.0L/2004 Malibu Maxx LT
1992 YJ "The Heep"/1994 Olds Cutlass Ciera 3.1/auto
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#3141885 - 10/01/13 07:40 PM Re: One spark plug carbon fouled?? [Re: callbay]
bubbatime Offline


Registered: 03/18/08
Posts: 2562
Loc: South Florida
Worn rings on one cylinder?
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#3141895 - 10/01/13 07:50 PM Re: One spark plug carbon fouled?? [Re: callbay]
NHGUY Offline


Registered: 10/09/11
Posts: 4109
Loc: USA
I prefer Autolite or NGK plugs.Although the "easy start" Champions arent bad.

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#3141988 - 10/01/13 09:14 PM Re: One spark plug carbon fouled?? [Re: callbay]
jhellwig Offline


Registered: 07/01/13
Posts: 590
Loc: Ottumwa, Iowa
If it fouled one while running you have an issue. Was the plug that fouled while running wet with fuel or oil?
_________________________
2013 Chevy Traverse lt 3.6l direct inection
2011 Chevy Silverado lt 1500 z71 crew5.3l
1983 Chevy K5 350
2007 Honda Rincon
1991 John Deere 318

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#3142515 - 10/02/13 12:43 PM Re: One spark plug carbon fouled?? [Re: callbay]
callbay Offline


Registered: 05/29/05
Posts: 655
Loc: Ozark Mountains
The spark plug that was fouled was dry.

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#3142877 - 10/02/13 06:42 PM Re: One spark plug carbon fouled?? [Re: callbay]
jhellwig Offline


Registered: 07/01/13
Posts: 590
Loc: Ottumwa, Iowa
I would look at a coil issue or plug wire then.
_________________________
2013 Chevy Traverse lt 3.6l direct inection
2011 Chevy Silverado lt 1500 z71 crew5.3l
1983 Chevy K5 350
2007 Honda Rincon
1991 John Deere 318

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#3143087 - 10/02/13 08:27 PM Re: One spark plug carbon fouled?? [Re: callbay]
JR Online   content


Registered: 08/08/04
Posts: 1014
Loc: Michigan born but my heart bel...
If one was clean on fould it is ignition. problem . air and fuel are good since. one plug is clean. check spark. i know the inline style ignition. tester increase the ignition. out put at the plug. i think the coil for that cylinder is weak not dead weak. if it was dead it would miss on the fresh plug. it is weak causing incomplete. combustion. hint the fould plug. that or

ken.

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