Re: 1935 Johnson Aero built 300 fuel mixture

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August 23, 2017 at 12:53 pm #63678
jerry-ahrens
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    If I remember correctly, the Aero Built 300 is a rotary valve motor of sorts. Running that engine at 50/1 or 40/1 or lean on oil, WILL destroy it. Use 1/2 pint of oil per gallon of gas, or 16/1 ratio. I do agree to use modern TCW3 oil vs. 40 wt.
    It’s true that outboard oils have come a long way… but, the vintage outboard is still the same, and it needs the right amount of oil to survive. Respectfully, Jerry