Name:   MartiniMan - Subject:   2007 Sea Ray Select Date:   5/11/2016 1:33:40 PM

Let me second what Lifer said about a compression check and make sure you do it on a fully warmed engine in order to be accurate. Having said that, aircraft engines have a compression check on at least an annual basis and it is usually only useful when a cylinder or valve is completely gone or as a long term trend monitor versus being all that helpful for a prepurchase inspection item.  

I would take it one step further for a boat that old with that few hours.  I would borescope each of the cylinders.  The main cause of damage to a motor sitting for some time is corrosion and a compression check won't answer that question.  It will only tell you if the rings or valves are worn.  It's possible it was properly maintained while not being run but I would be very suspicious of corrosion.  Having just spent $5K overhauling an engine that had sat for a number of years before I bought it I can tell you its a costly mistake.

You will also need to inspect all the belts and hoses as they will also likely be in bad shape if it has indeed been sitting that long.