Do as much of the cheap and easy stuff that you can, but start looking for a good stator when you're not doing the cheap and easy stuff.
A different but similar experience: Different in that the engine was a twin, so both plug wires came from one ignition coil. Similar in that sled had no spark, so I hooked up a single coil from a triple sled, and had spark but weak. Re-hooked up the original coil and sled ran, but not so good, and only around the yard once or twice. Back to the single coil test, got spark, back to original coil and sled ran like crap for a few seconds and died. After a little more dinking around like this, finally couldn't get any spark at all. Replaced stator and both sparkplugs were LIT UP! Sled runs.
Did all the ohm and wire and coil and plug cap checks, and different CDI, and cleaned rusty flywheel, etc. None of it helped until the stator was replaced. FWIW