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Answered 2009-02-08 20:10:39

The 2.5 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.

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I have a 1999 Mercury 2stroke 5HP outboard and the owners manual states 50:1 Gas/Oil mixture.



50:1 ratio which is 1 pint to 6 gallon of fuel


A 115hp Mercury outboard boat motor has a fuel to oil ratio of 50 to 1. This translates to 16 ounces of 2-cycle oil to every 6 gallons of fuel.


A 4hp Mercury outboard requires a 50:1 fuel to 2 cycle oil mix.


I would assume 50:1 but call the manufacturer to confirm


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.



By 1971, virtually all outboard manufacturers had gone to the 50-1 mix, and Mercury prided itself on being ahead of the game, so you are safe with the 50-1.


For the Mercury 9.9 Two Stroke Engine it is 50:1...


A 15hp mercury requires a fuel to oil ratio of 50:1, roughly one pint of 2 cycle oil, to six gallons of gasoline.


The 7.5 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.


Mercury outboards prior to 1966 use a 24:1 fuel to oil ratio.


A 50hp Mercury outboard, requires a 50:1 fuel to 2 cycle oil ratio, roughly one pint of 2 cycle oil, to six gallons of fuel.



The 120 hp, Force / Mercury outboard, requires a 50:1 ratio, one pint of 2 cycle oil to six gallons of fuel.


The proper oil fuel mix is 50/1 1 liter of 2 stroke oil for every 50 liters of fuel petrol or 20 ml oil per liter fuel


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.


A 3.3 hp Mercury outboard for 2007, requires a 50:1 fuel to oil mix. This is roughly 1 pint of 2 cycle oil, to 6 gallons of fuel.


An 1985 model, 25 hp Mercury outboard requires a 50:1 fuel, to 2 cycle oil ratio.


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 1978 model, 115 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.


If not using the oil injection system, a 150hp Mercury outboard would require a 50:1 ratio. This is roughly, one pint of 2 cycle oil, to six gallons of fuel.




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