I have a few questions about a new motor i picked up for my tri-hull. It's a 1964 Evinrude 90hp starflite 90-s. Model#904935; serial#E03005<br />#1; what type of shifting does this motor have? i dont see a cable hook up for shift lever so is it electric? If so what type? Will i need a special control box for it?<br />#2; While pulling the old spark plugs i found the number 3 plug has what looks to be a bigger set of threads than the rest, it's the same type of plug (Champion J4J) but where the threads are its a bigger diameter and the thead size is also bigger. Was this a fix from someone stripping the threads and if so what do i do to put in the new plugs?