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AWB, Until Duane arrives (Hes THE MAN on Spark Plugs, take his advice) its my humble opinion its NOT so much what brand you choose BUT THE HEAT RANGE that can help reduce fouling and Im sure Duance can advise you on which make n model plug has a higher heat rating but still compatible for use in your tractor. Then theres the old trick of adding an extra plug washer to raise their temperature. That all being said are you using any sort of radiator air flow restriction or other temperature control devices TO GET N KEEP THE TEMPERATURE UP cuz that can help reduce fouling. Youre not running the carb and richer then necessary are you?? (any black smoke out the stack) Have you checked the air cleaner and any air piping and choke butterfly (stays full open) to insure good inlet air flow with no restrictions?? Does your ignition produce a good visible blue spark as opposed to a faint thin wimpy yellow one?? Cuz a weak saprk contributes to plug fouling. Id use wire core NOT carbon core suppressor type plug wires cuz you dont wanna waste any precious spark gap energy as heat in the plug wires. Check that stuff out n do as Duane advises on plug choice and maybe try Bob M's posted conversion chart for plugs n see if things improve. BUTTTTT TT Id suspect a weak spark or youre not running up to temperature or the carbs too rich or shes an oil burner BEFORE I thought any different spark plug was gonna suddenly cure the problem..... ..... .... Take care, see what plug Duane recommends John T
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