Hi AVP
I have a Kirby Tecumseh KAV 74 that was totally in a shambles when I found it, and spent 12 months off and on restoring it. Runs like new now. Had exactly same flywheel as your pic.
I bought a steering wheel puller from Repco ($40 approx), drilled 3 holes where the 3 lumps are on the flywheel, then tapped thread into them, and pulled it off with the puller. Came off with a bit of a shock, but was ok. They are fairly tight first time around.....
The metal is fairly soft-can pretty much just thread the 3 bolts you are going to use to pull it straight into the Aluminium. I didn’t even need a proper tapping piece.