Re: Merc 115 serial number
That is not the serial number. It should be 6440183-7200643 if it's an 84. The number is located on the starboard side on the trim/tilt plate.(assuming the trim/tile and mid section are original. They look as such. I'm in the process of rebuilding my 84, very simple and easy to work on if you have any mechanical skills. Most of these engines went 25+ years w/o needing any major service. Try that with today's expensive crap.
If possible take a look at the head of each piston through the plug hole to see how the crown looks. The ring pin on these pistons had a a habit of pushing into the piston, causing the ring to rotate and then breaking going into the combustion chamber. This happened on two of my pistons but i still had compression.
How much are they asking for her?