Under contract - 2003 Neptunus 56 w/ cat 3406e - top speed/rpm issue

He didn’t survey it yet. Read the first post. Only an “Initial sea trial”

Meh, no lanes. I love the old mechanicals myself. They love me, too. They give me gifts of oil and smoke with extreme generosity. You can tell they care.

But they never quit.

Something else to think about;
If these engines have been running over loaded, What damage has been inherited?

Sweat beats rust every time.

Sad to read but this is not the path to take when looking for a used yacht.

You have made the very rite decision.

We have a 43 year old Bertram that has a great history and we would be proud to show off her records these last 18 years of our ownership.
Not for sale (yet), but would still enjoy bragging a few hours on her records.

Apparent these kids don't want to show or brag any.

Silly of them as nobody will buy a boat that is 150rpm short.

Don't lose sleep. Any seller or broker behaving like that knows something that they don't want to share. Under contract and during your due diligence period you have every right to this information. If it isn't forthcoming upon request, it's because they don't want to share it for fear you'll discover that the rebuild was performed under a shade tree or that it suffered problems during the rebuild sea trial. Any honest documentation would be readily shared, transparent.

Good call, even if I'm sure it's annoying to have wasted some time and money.

The broker is Mr. Robert Damas of Florida Yachts International, as referred in the ad of your OP, I suppose?
I'm saying this because it's only fair to give him publicly the opportunity to explain why he didn't want to disclose the seatrial.

Also because - as we are now inferring - the real one is that either there wasn't any proper seatrial or it wasn't satisfactory, it's equally interesting for anyone in the market for a used boat to know that it's better to steer clear of this one, and of this gentleman in general.

To be fair brokers list boats but do not sea trial them. That s not their jobs. In this case the broker knows by now that the deal fell thru because of performance issues so he has two option. Disclose the issue to a prospective buyer or tell the seller not to accept per survey sea trials so that pressure is increased on the buyers. Which option will be pick? Not holding my breath

Fun part, the broker now has the obligation to share the performance question relative to known potential defects given the failure of a contract with respect to the mechanicals. Any chance that gets shared going forward?