John B. said: (quoted from post at 15:38:50 07/25/10) I believe on LP engines the sparkplug gap is considerably closer than on conventional gas engines.
It takes more voltage to fire across the gap in a LP fuel mixture than a gasoline fuel mixture. That is why the gap is usually narrower. The problem with the old tractors is that they probably only have about a .025 gap to start with so you can't narrow them up much and still have a wide enough gap to get a good spark to start the ignition. About the best you can do is to use low resistance plugs and wires to obtain the best spark available.
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