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Discussion Forum
Show Parts for Model:

#1 plug fouling

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10-30-2000 19:26:48

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My 8N has a tendency to foul the plug on the #1 cylinder closest to the fan. The plug fouls with a dark and powdery carbon residue, but thankfully no oil. All my other cylinders burn nicely. Eventually after 30 hrs or so the plugs has so much carbon that it begins to miss fire and creates problems. What would be the cause of this? Thanks to all in advance!

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Andy NC

12-16-2001 02:20:13

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 Re: #1 plug fouling in reply to Bud, 10-30-2000 19:26:48  

On my 52 8n the exaust valve retainer clipe was warn. This was letting the exaust from the others push the valve open when it should have been pulled shut.

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Mike B IL

10-31-2000 05:57:49

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 Re: #1 plug fouling in reply to Bud, 10-30-2000 19:26:48  
Mine did the same thing. I changed the thermostat and that stoped the problem. It only fouled out during cold weather was my hint. I think that #1 cyl being closest to the water pump was running colder than the rest.

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10-31-2000 04:35:47

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 Re: #1 plug fouling in reply to Bud, 10-30-2000 19:26:48  
Have you looked at the wires and cap? You could have a bad wire not getting a good current. You know Firing but not Real good.

You said you was getting a dark and powdery carbon residue. If it were on all of them I would say check out the Choke but It's only one plug.

Just a thought.

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