Has it been mentioned yet to check the condition of the wire clip inside the boot and its connection to the spark plug wires core?
The wire clip terminal inside the boot is prone to corrosion from moisture and the pin on the clip can rust or corrode completely away causing a weak or no spark situation. Since the spark plug on this motor is exposed to the elements, I’d check it before going any further on this motor. If the second plug had a weak spark, it could be from the clip inside making an intermittent connection with the wires core and when the wire is bent to its installed position, there may be no electrical continuity at all, or in other words, no spark.
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