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Our neighbor who has a lot of motor repair experience says to mix it 50:1. This eliminates the chances of adding too much oil into the fuel mixture as the fuel you are using already has the right fuel to oil ratio. american airlines 5818 See an earlier … A 1957 10 hp outboard would call for a 24:1 mixture. Re: Johnson 35hp fuel mixture The fuel mix is 50:1 91 RON rated petrol to TC-W3 rated outboard oil. The original mix of your engine was 24:1. wentoonxyz
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