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 - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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