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John Deere Tractors Discussion Forum
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Re: 1947 D Carb adjustments and ideas for backfire

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John Deere D

04-10-2014 07:24:05
199.66.168.59



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Start by swapping the spark plugs and verify if the problem changes to the other cylinder. Remove the distributor cap and make sure contacts inside cap are clean and shinny. Make sure rotor is firm on mag armature (not loose)and all metal parts of rotor are shinny. Make sure there is no moisture inside Mag Cap. If you have access to a multi meter check each spark plug wire for resistance (ohms). Spark plug wires should have a metal conducting core NOT CARBON if your D has a Magneto. Make sure the seat (point where the spark plug bottoms out on the head) are clean and shinny. When you purchase new Spark Plugs be sure to purchase plugs with NO resistor. Check to see that the two outlets on the Mag Cap where the spark plug wire plugs into are clean and shinny. Usually the top spark plug wire on the Mag runs to the left cylinder Spark plug, and the bottom spark plug wire runs to the right cylinder spark plug. Right and left are viewed as if you are on the tractor operating it from the drivers seat.

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