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Torquing one of these flywheel nuts is a little tricky because there is usually no easy way to hold the round flywheel in place while torquing the nut. Be very careful trying to jam the flywheel with a screwdriver or something like that, good way to break the flywheel or engine block casting. Using a big strap wrench is the best/safest way to torque the flywheel correctly. Not enough torque can result in a sheared flywheel key which will kill spark and damage flywheel/crank tapers. Over torque (using an impact gun) can push the flywheel too far down onto the crank, distort the tapers, and damage ignition components.
But, let’s back up a bit. From what I have read, it seems like you have some sort of carb/fuel delivery issue keeping the engine from running right. It seems like you do have to pull that flywheel off to access all of the carburetor attaching screws. So, perhaps it is best to pull that flywheel back off, so the carb can be removed, disassembled and cleaned.