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Tractor Talk Discussion Forum

fouling plugs

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Mark Pearce

01-02-2004 01:31:13




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I have a 1948 John Deere A that likes to foul plugs. I cleaned out the oilbath system which had a lot of build up of dirt and crud. Thinking would take care of the problem I put in a new set of Champion D-23 plugs Results: Plugs fouled within a few days. I set the valves cleaned out the carb changed the oil. She likes to run rich leaving the plugs very black carboned up. The engine runs strong. I've tried ajusting the carb, just seems to always run rich. Any thoughts? I wish I bought stock in Champion. Thanks, Mark Pearce MN

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buickanddeere

01-02-2004 08:16:01




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 Re: fouling plugs in reply to Mark Pearce, 01-02-2004 01:31:13  
No resistor Champion plug ever worked in a two cylinder Deere. Hurl them into the trash and get something else. Make certain coil polarity is correct, some tinker often swaps the battery or coil polarity. The rich running engine will foul any plug. Unless the coolant temp is 180F and 195F better, the engine will have to be operated to rich to avoid hesitation or stalling.



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DRL

01-02-2004 06:19:19




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 Re: fouling plugs in reply to Mark Pearce, 01-02-2004 01:31:13  
If you haven't already, go to the JD board on this site and ask you question. There are a couple of fellows (John T. and Clooney) who will give you a short course on trouble shooting, setting the carb and what wires and plugs to use. Main thing is to use the wire core plug wires, not the newer type of wires for electronic ignition, and to use the proper heat range on the plugs. Those guys will give you a lot more info if you ask.

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Phil

01-02-2004 05:43:37




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 Re: fouling plugs in reply to Mark Pearce, 01-02-2004 01:31:13  
Had the same problem, I put in a set of sparkplug adapters with Bosch platinum plugs, have never changed them since. (2 years ago).



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No. Ala.

01-02-2004 04:43:08




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 Re: fouling plugs in reply to Mark Pearce, 01-02-2004 01:31:13  
Mark My guess would be that too rich of a gas mixture or not enough air is your problem ( black soot is the clue that I am basing my opinion by) I had an H Farmall to do this same thing one time. Also see if you can find you a couple of auto-lite plugs ( I don't know why but it seems to me that they do better in a J.D. .



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dhermesc

01-02-2004 05:51:15




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 Re: Re: fouling plugs in reply to No. Ala., 01-02-2004 04:43:08  
First you do need to lean out the carb, it might be well worth the money to get somebody with experience to set your carb. I screwed around with mine for six months (had both soot and fuel fauled plugs) untill one day I quit following the manual that suggested adjusting it in 1/4 to 1/2 turn increments. Attempted to "starve" the carb by shutting off the fuel using the enrichment screw, six or seven full turns and suddenly it smoothed out and ran right. Then I started adjusting it with quarter turns.

I did learn that platinum plugs will help until the problem is solved.

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Allan

01-02-2004 04:11:50




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 Re: fouling plugs in reply to Mark Pearce, 01-02-2004 01:31:13  
Hi Mark,

Is the fouling with a dark reddish appearance? If so, this is a sign that she is pushing oil and is usually the main reason for plug fouling.

Allan



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Mark Pearce

01-02-2004 08:38:14




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 Re: Re: fouling plugs in reply to Allan, 01-02-2004 04:11:50  
Allen, No not dark reddish , but jet black "soot" It will sometimes run better (should say longer) if I monkey with the carb jets. Thank you. Mark



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No. Ala.

01-02-2004 17:49:53




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 Re: Re: Re: fouling plugs in reply to Mark Pearce, 01-02-2004 08:38:14  
Mark I'll go along with dhermesh's solution about the rich gas mixture needs adjustment.Might pay to try also to see if you can get a man named Cooney to reply. I think he is among the best when you need to know about a J.D.



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