The fouling is lowering the voltage required to make the plug fire, Increasing the available voltage may not make a difference that is satisfying (or very effective). If it is rings that are an issue. or stuck rings on one cylinder, an anti fouling adapter might make a substantial difference. When it begins to foul that plug, use insulated pliers to pull the wire off of the plug about 1/4 inch. If it then runs, resistor plugs might help. Some pull the rubber boot a ways off the plug to allow that gap to increase the voltage enough to fire through the fouling. Try these ideas before going to the expense of the ignition system changes. all good standard coils will produce plenty of volts it is the fouling that does it. It will require a rebuild to actually fix it. Jim
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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