Top contenders: A loose/cracked manifold that is tight against the head when first started, but warps when heated up allowing air to bypass the carburetor, allowing one cylinder to go lean and stop firing.
A spark plug with fouling that becomes conductive and stops firing when warmed.
A failing coil that is internally shorted such that it gets hot and reduces spark output which affects the weakest spark plug/plug wire combo causing the misfire.
For the manifold problem get it warm enough to mis, then spray non chlorine carb cleaner, or propane from a small hand torch with the burn nozzle removed around the the manifold to feed fuel into the leak. Do this outside!!.
For the bad plug possibility put in a new set. also check the conductivity of the plug wires. If resistor wires less than 7000 ohms/ft is required if wire, there should be less than 5 ohms.
for the coil feel it when it is misfiring. If it is warmer than reasonable, and warmer than its bracket, it is likely going bad.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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