I once rewired the lights on an aluminum runabout I had. (A 90 horse Merc on a 17' runabout gets with the program, by the way.) I thought I was clever to use wire nuts for the connections. It turns out that wire nuts are NOT clever. I ran the boat for most of the summer without any problems...
My 7.5 hp Evinrude chatters in and out of gear when I put it in forward. It doesn't pop all the way out. I can hold the shift lever forward and that helps, but doesn't prevent the chatter. It works fine in reverse, but that's no way to fish. It is an old motor, but I don't know the year...