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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Today's Featured Article - History of the Field Marshall Tractor - by Anthony West. Any restorer who has some knowledge of turn of the century farm machinery, will recognize the name Lanz Bulldog!! This machine was to say the least unusual in its appearance. The huge flywheel and coffee percolator shaped exhaust. Along with square body lines and cylinder head protruding forward of the front axle. Would become the visual differentiation that people would quote to separate the Lanz from other period machines. The Marshall company based at the Briannia Works in Gainsborough
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