Trying to determine year on my 85hp merc outboard. Has thunderbolt ignition and found only one website for ID (which indicates a 1977). Every other web site I go to including looking for parts, my serial number doesn't fall within the range for any year. It's an inline 4 with serial number of...
I just picked up a 1970 boat and it has a mercury 850 85hp on it. But the numbers I'm finding don't seem to match up. What year is this. Found this number on the mount bracket 483 3446 and this number on the starboard rear side of engine 847 3490
