SteveB wrote:
Is if possible for oil, like gas to go bad if it sits in a boat too long?

I'm getting that '89 Merc 40hp four banger Tuesday. I remembered when I was
talking to the guy that he said it has problems running at top speed. I
asked if he ever ran it without oil in the gas, and he said he always ran a
50:1 mix, IIRC. Well, that boat has an oil injector. Maybe he ran too much
oil. Is it possible to disable the oil pump and run just mixed gas? It
looks like I will have to take some time and a manual on this one to figure
out what's up with the engine, and the tilt. I did pick up fresh plugs for
it.

Should I drain the old oil, as well as the old gas?

Steve



The carb is dirty and needs to be thoroughly cleaned. That would
explain the problem occurring only at higher speeds.