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Mercury outboard 115 hp, serial number 2931955, is a 1970 year model.
The 115 hp Mercury outboard, serial number OD049801 is a 1991 year model.
A 115 hp Mercury outboard, serial number OC238909, would be a 1990 year model.
1983.
A 115 hp Mercury, serial number 6580904, is a 1984 year model.
my sereil #is 4312912
Set the gap at .035 in. for a 115 Mercury.
The engine is 17 years old, manufactured in 1991.
The dry weight of a 1988 model, 115 hp Mercury outboard is 312 lbs.
The dry weight of an 1990 model, 115 Mercury outboard is 326 lbs.
4 cylinder dates from 1989,you may have the first 2 digits wrong.
360 pounds