In this video I show a trick how I remove mower engine flywheels quickly without needing a puller.
I basically use 2 chisels and carefully tap them underneath the flywheel. This causes upward pressure on the flywheel. Reinsert the crankshaft bolt without the washer. Then tap on the bolt with a cracking hammer. With the chisels creating pressure on lifting the flywheel, the impacts from the hammer with cause the flywheel to break loose from the crankshaft.