1958 Evinrude Outboard Motor 7.5HP?
Bubba Gubbins: https
make sure the key is in the keyway & the timing has to be right.
Old Man Dirt
There is only one way to put the flywheel on if I remember right. It has a keyed crankshaft so getting out of alignment is pretty hard. http://www.marineengine.com/newparts/part_details.php?pnum=OMC0580217