Re: removing fly wheel cover on 2001 Johnson 115hp
On plastic you can only crank down so tight on the bolt before the plastic cover cracks, examine the bolts that come out for signs of thread lock.
I would threadloc and tighten like a sparkplug...no more than that.
What is an unloaded starter motor gonna tell you?
Sounds like something let go in the bendix if the gear went through the roof.
I noticed you have a 2001, those manuals are either ebay or ordered through the dealer. You WILL throw the seloc away when you see the real deal.