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Ken, blackened up plugs are a common problem, especially if you use the tractor for light loads and she never gets to warm up properly or if youre just parading it around or she never really warms up. In my very lightly used show tractor, its an even worse problem. In the days when we used the tractors long hot and heavy loaded for hours on end, as they were designed for, plug fouling was less a problem because the temperature was sufficient to burn off excess plug residue and they developed that nice gray color you like to see. Some of the causes of black plug residue can be: (assuming its flat sooty black, not shiny thick uneven oil black) Excess unburned fuel, like the carb is set too rich (try leaning the power and idle jets to where you get little black smoke at idle or under load) or the choke butterfly plate isnt fully opening even if the lever shows it full open. Or, the needle seat/valve may be leaky and raw fuel gets on the plug. Or, youre shutting her down by choking instead (some actually do that you know) of turning off the gas and lettign her run out of fuel. What type and octane of gas do you use??? The tractor is low compression only requirign low octane gas, not high octane which is more difficult to initiate. Are you runnign any additives??? Some can leave a plug residue A weak spark. Try a fresh set of points and what shape are the plug wires in??? Too cold plugs. Try Autolite 388 if styled and 3077 if unstyled. Theres more, but this can be a start. Good Luck, Ol John T Nordhoff
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