40:1 ratio
An 1985 model, 25 hp Mercury outboard requires a 50:1 fuel, to 2 cycle oil ratio.
The 1981 model 9.8 hp Mercury outboard requires a 50:1 ratio, this is roughly 1 pint of 2 cycle oil, to 6 gallons of fuel.
The 1978 model, 115 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The 1973 model, 7.5 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The 1995 model, 25 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The 1984 model, 9.9 hp Mercury outboard requires a 50:1 ratio. This is one pint of 2 cycle oil, to six gallons of fuel.
The 1969 model, 80 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The 1994 model, 9.9 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The 1998 model, 40 hp Mercury Force outboard requires a 50:1 ratio, one pint of 2 cycle oil to six gallons of fuel.
The required fuel/oil ratio for the 98 model, 25 hp Mercury outboard is 50:1. This is roughly one pint of 2 cycle oil, to six gallons of fuel.
The 1978 model, 9.8 hp Mercury outboard, requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The 2002 model, 25 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil to six gallons fuel.