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Almost any impact gun - 1/2" or bigger - will get the flywheel nut off.
My Craftsman Pro *electric* impact gun has taken off flywheel nuts, and it's only rated at 250 lb.-ft.
If the flywheel nut is stubborn, use some heat - i.e. torch - to help.
Once the flywheel nut is loosen, it's just a matter of banging it with a hammer or equivalent.
If you still can't do it, you need more muscles - don't blame the hammer.
I've gotten the flywheel to loosen with a *regular* hammer - not a mini sledge.
You need to just WAIL at the flywheel like you're going to kill it.
Keep away from the clutch disc mating surface areas and the outside teeth (for the starter).
Of course, all safety disclaimers apply here.
Remember, the eccentric shaft end is tapered where it mates with the flywheel.
Pounding it in - towards the engine - will cause the flywheel to bounce back off the taper.
-Ted
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