Reply To: Evinrude 7.5 idle

[billw]

Like Dave said, with those numbers, it may be a blown head gasket. 7.5s don’t have a metal ring for each cylinder, built into the gasket, like larger motors. I have a 7.5 myself, that I have to get around to doing a head gasket on. This sounds like a good thing for you to try. Be advised that when the head is off, you should check the head’s surface for machineed flatness; as they do tend to warp.

All that being said, 35 to 40 psi???? It is a miracle that the engine even starts, never mind idles badly. Is it also hard to start?

Long live American manufacturing!