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The 1998 model Mariner outboards use a 50:1 ratio.
The fuel oil ratio for a 140 hp Mariner outboard motor is 50:1. Mariner is a brand of the Mercury Marine company.
Combustion piston engines can have two different work cycles, 2-stroke and 4-stroke. 2-stroke tends to have a better power to weight ratio, but pollute more. A 4-stroke outboard is simply an outboard engine that works the same way as a car engine.
The correct ratio for a 5hp Mariner outboard would be 50:1, this is roughly one pint of 2 cycle oil, to six gallons of fuel.
The 850 model, 85 hp Mercury outboard, is a 2 stroke engine requiring a 50:1 fuel to oil ratio.
A 5 hp Mariner outboard will do fine with a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
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A 175hp Mercury outboard requires a 50:1 fuel to oil ratio.
The 3.3 hp Mariner outboard requires a 50:1 ratio, one pint of 2 cycle oil to six gallons of fuel.