I may be buying a grey 50hp, four cylinder two stroke Mainer outboard
motor I'm trying to determine the age of. It burns oil/gas straight from
the tank without any of that new-fangled direct injection. It says
"Power Trim" on the front and has a serial number of 6367819, no model
number I can find. It is supposed to love fuel.

Any idea what year it is? And this burns 50:1, doesn't it?

CXapt. Jeff