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The fuel/oil ratio is 50:1.
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 55 hp Johnson outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
They are all 50 to 1
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The 850 model, 85 hp Mercury outboard, is a 2 stroke engine requiring a 50:1 fuel to oil ratio.
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50:1 oil mix is typical for outboard two-cycles. Some do a little more in the winter.
The 2 stroke, 9.9hp Johnson outboard produced after 1966, requires a 50-1 ratio. This is roughly one pint of 2 cycle oil, to six gallons of fuel.
The recommended fuel/oil ratio for a 200 Johnson 130 horsepower outboard engine is 50:1. This ratio should always be used or engine damage can occur.
50 to 1 ratio
A non-oil injected, 150 hp Johnson outboard, of the 2 stroke family would require a 50:1 ratio. This is roughly one pint of 2 cycle oil, to six gallons of fuel.