KarTek is correct. My father had a small engine repair shop we pulled a lot of flywheels. When a rotary mower hits a rock the key will shear on the flywheel and in the worst case the crankshaft will bend.
The majority of the time the flywheel nut can be backed off enough to protect the threads. A few smacks with a hammer and pressure with a large screwdriver under the flywheel will free it.
Make sure you disconnect the spark plug wire and clean up the flywheel while its off.
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'86 300E 5 speed
'71 Triumph TR6
'46 Cushman Scooter
'41 Ford 9N tractor
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