No need for tread locker. Just tighten everything up and go boating.
You might be over choking and flooding it at the start. Release the choke the instant it starts to fire; and, if it doesn't go, repeat.
Not "soft", old.
Testing your rectifier http://myoutboardengine.com/rectifier.html
I have a 1998 Evinrude E115TSLECM that the primer bulb looses pressure idling for an extended time( let's say 15 min or more at no wake speed).