What is the gas oil ratio for a 1980 4 hp Evinrude outboard?

What is the proper oil gas-to-oil ratio for a 25 horsepower Evinrude outboard motor?

  • Answer:

    The late model 25 Evinrude suggests operating on a 100:1 ratio. I prefer the old time tested 50:1 ratio, one pint of two cycle oil, to six gallons of fuel. I have never seen an outboard powerhead failure, due to running a 50:1 mix.

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