it depends on the year. i have a 1978 80hp and it takes a champion copper marine plug. the part # is L78V
1978 80 Mercury Outboard IDLE ADJUSTMENT
An 80 hp Mercury outboard, serial number 2561812 would be a 1969 year model.
An 80 hp Mercury outboard, serial number 6304884 is a 1983 year model.
An 80 hp Mercury outboard, serial number 6288030 is a 1983 year model.
An 80 hp Mercury outboard, serial number 7206568 would be a 1983 year model.
An 80 hp Mercury outboard, serial number 3055133, would be a 1971 year model.
If manufactured after 1965, an 80 hp Mercury outboard requires a 50:1 fuel, to 2 cycle oil ratio.
55 hp.
The dry weight for an 1983 model, 80 hp Mercury outboard, is listed as 265 lbs.
The spark plug gap is .060.
An 80hp Mercury outboard, serial number OC136078, would be a 1989 year model.
could you please tell me the weight of a 1980 mercury 80hp 2 stroke outboard motor