Try it with the kill wire removed from the coil.
If there is still nothing at the plug, try a brand new plug.
Some of these small engines are very sensitive to the grade of the plug and in particular to weather they are resistor or plain.
The other thing that happens is the lead goes bad.
Most are a screw in fitting then potted to prevent water getting in so you can dig them out & replace them.
try pulling it in a very dark place ( opps that did not come out well did it ).
Watch the wire and see if you get little flashes on the outside.
What happens is the spark runs down the wire core to the cap then crosses over to the outside of the lead and runs back to ground out at the coil.
This is a lot more common than many would believe