Join Date: Oct 2008
Location: South Coast Ontario
Thanked 93 Times in 82 Posts
Rep Power: 10
If the engine sat idle for almost seven months, and having swapped out all of the usual likely suspects, and if she revs to 4k with no load, then I would look at the prop - I bet your prop is fouled, loading up the engine, which explains your symptoms.
Too bad your marine mechanic didn't suggest a dive on the prop BEFORE spending time sea-trialing the engine, because that would either solve the mystery, or eliminate one more suspect, leaving us only to conclude that yes, aliens are responsible.
either that, or those meddling kids and their dog.