Draining the tank doesn't purge bad gas from the carb. Thus...
I'd pour about a teaspoon of fresh gas right into the carb throat and give it a pull. See if it'll even fire/sputter. If it does, but won't keep running, you at least know you have spark. I'd repeat this step three or four times. Sometimes that's enough to get the stale gas out of the bowl.
If still no constant running, I'd drain the carb bowl to make sure I had fresh gas in the bowl and try again.
If it wouldn't even fire off with the gas down the throat, I'd check to see if there was spark.
The torn boot may "contribute" to a carbon trail whereby the spark can travel to ground OUTSIDE of the combustion chamber. So if the raw gas trick described above doesn't solve your problem, remove the boot, wipe the plug real good with a clean rag, and firmly reinstall the wire/boot.
By the way, all this assumes you have the key on...