This is a question all of us outboard owners will come up against at some stage.
I have a old 2 stroke carbie 200 hp 1986 Mercury which just will not die , such a strong motor , heaps of power yes burns oil , noisey but then again I just love the 2 stroke throb, cannot talk to your mate when under way, heavy on the fuel.
The options I am looking at is either a etec 150, mercury optimax 150, or a 4 stroke 150 mercury,
All have good and bad points , 4 stroke is only slightly heavier, but quieter at mid range and better fuel consumption mid range.
That is where I run most of the time mid range. But at this stage can I justifiy to "she who must be obeyed" the cost of a new outboard ( around 20K)