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6 years old
The engine is 17 years old, manufactured in 1991.
close to 20 years
Mid 80s
I believe it is a 1995. Have a look on http://www.outboard-engine.com . They have information about years and serial numbers.
1966-67
Motor should be fine as long as no water got into the cylinders
1965 to 1970
Change the water pump impeller, they get old and need replacing every 5 years or so depending on wear.
23 years old made in 1988
Mercury outboard serial number 1897280, is a 1966 year model, 50 hp. A listing of serial numbers and model years can be found at the link below. Your unit is listed as a 1977 with these possible models: - E (electric start) - L (long shaft -20") - M (manual rope start)
Try this link http://www.outboard-engine.com, they have a database with the years and serial numbers of mercury.