Ideally you would use a Knock Off tool which is a lump of metal that screws onto the crank in place of the nut. Screw it fully on, back it off one turn the give it a sharp tap with a fair size hammer while either applying moderate leverage to the fly wheel . If the engine is loose from the chassis I take the weight of the lump by gripping the flywheel in one hand a smiting the knock off tool with the other – the weight of the lump is enough without leverage. Knock off tools are still available and not expensive. If you have, or know a man with a lathe, it’s not difficult to make one.
You can do the same using the flywheel nut but there is a risk.
Some Aspera / Tecumseh flywheels have three untapped holes near the centre to take the self tapping screws from the manufacturer’s puller – quite easy to duplicate with a bit of scrap and three Taptite screws used by various manufacturers for assembling machines – always save them when scrapping anything that uses them.
A selection of knock offs from my tool box – no duplicates !
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