Will a hotter coil solve the problem? Probably not…
If cleaning or replacing plugs temporarily cures the misfire, the problem is not likely the coil. In fact installing a “high voltage” coil may even make it worse.
Suggest rather you look at the following:
Spark plugs’ heat range is too cold. Switch to plugs 1 – 2 heat ranges hotter than what the manual suggests. (Note: This is a common problem when you combine extended operation under light load - the “yard work” you mention - with the poor quality gasoline we’re stuck with today.)
Carburetor is set too rich. If you see any trace of black in the exhaust – especially at idle - it’s too rich!
If you use the choke to start the cold engine, get the choke opened and the engine under load as quick as possible. (Excessive choking on a cold engine fouls plugs VERY quickly…)
Make sure the engine’s thermostat is present and working. A cold engine lightly loaded tends to foul plugs.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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