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Fouled plugs on 1941 H

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Jim Peters

12-29-1999 19:07:43




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Would like to know if anybody has found a spark plug (Brand and heat range) that resists carbon fouling for a John Deere H. I have tried Champion and AC but both plugs foul up after an hour of running, especially the Champions. Seems that the H just does not run hot enough.




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HMan

12-30-1999 13:23:56




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 Re: Fouled plugs on 1941 H in reply to Jim Peters, 12-29-1999 19:07:43  
Try some autolite 388's, gap them a little wider than the book calls for, maybe an extra .005. You gotta run your carb as lean as possible and still get her to run smooth (both screws). You are right, it will run better if you can get the temp. up. The 388's run the best in my '41, I've tried them all but NGK's. I plan on trying a pair of the NGK's, they are a very good plug in other engines. My $.02

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CLOONEY

12-29-1999 20:13:21




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 Re: Fouled plugs on 1941 H in reply to Jim Peters, 12-29-1999 19:07:43  
Jim, I agree with Rob on AC plugs. Also make sure you are using copper or steel cored plug wires (not carbon core) set idle screw as lean as you can, and still idle ok. I have had some luck using 2 gaskets under plugs (ups heat range of plug slightly), if it still fouls plugs it might have a plugged air filter, need rings or have a weak coil in mag. I have a 39 "H" that never fouls plugs. It has 2 gaskets under plugs for play,& I take 1 out when I work it hard.

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Rob

12-29-1999 19:49:01




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 Re: Fouled plugs on 1941 H in reply to Jim Peters, 12-29-1999 19:07:43  
I have had really good luck with A-C C86's in my A, B, and 50. If this doesn't work you could go to the next hotter plug [C-88?] but I have had good luck with them. Also, try side-gapping the plugs.
Bend the ground electrode to the side to set your gap. This seems to expose the spark to the fuel mix more and my tractors seem to idle smoother and start easier. This is also the claim to fame of "Splitfire" plugs.

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Jim

12-29-1999 20:11:42




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 Re: Re: Fouled plugs on 1941 H in reply to Rob, 12-29-1999 19:49:01  
Rob,
Thanks for the suggestion. I will try a set of these tomorrow. If I understand side gapping, you are referring to bending the ground electrode laterally such that the edge of the ground electrode is aligned above the center of the insulated electrode or 'post'.

Again, thanks.

Jim



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RonMC

12-29-1999 20:51:48




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 Re: Re: Re: Fouled plugs on 1941 H in reply to Jim, 12-29-1999 20:11:42  
Hi - just to add my 2 cents, you can open the electrode up enough to use a small triangular file to put a v-notch in the firing tip. This will give multiple paths for the spark and make it less prone to foul. I intend to check to see if NGK makes a cross-over plug to fit my machine as I'm really impressed with how clean they run in some of the old cars, and they use the v-notch design. Worth a shot ?

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HMan

12-30-1999 13:09:38




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 Re: Re: Re: Re: Fouled plugs on 1941 H in reply to RonMC, 12-29-1999 20:51:48  
NGK does make a medium heat range plug for a styled JD, sorry I don't know the number.



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