“But there’s a thick rubber ring that I cannot find any use for. It’s not the 344037 – Gasket which sits on the Nozzle. See attached image where red arrow points at the gasket. Does this gasket have to be attached to the carb I have on my Evinrude 18HP Fastwin 1960 mod 15032?”
You don’t have to worry about that one. It’s for some earlier 10 horse models and maybe others. But not for your 18.
