Who's our resident outboard motor guy?

Yeah I just found that out. Shame.
Ive had several outboards, most of them johnny- rudes. But older than this one.
Only ever worked on 1 merc, the 1st few were Elgin's that my dad had when I was a kid. Parts for those were already hard to find in the late 70s.
I've done some googling and everything I'm finding says the thing thinks it's overheating.