Re: 94 johnson 40 hp fuel/oil ratio?
Of course you know that the 48:1 ratio that JB mentioned is the actual, accurate mixture, but is normally called "50:1".
I believe our metric friends actually mix at exactly 50:1. Or at least I'd assume so since they aren't bound by pints and gallons. I also have no idea what the "normal" size portable tank is in the rest of the world, maybe 25 L?
Of course, the US system was based on a 6 gallon tank and a pint of oil (or before that a quart, when they actually called it 24:1 instead of fudging and calling it 25:1; why "they" don't do that now and just call it "48:1", I have NO idea).
I remember in the early-ish 60s when our "big" (65 hp) 650 Merc had a 5 gallon tank and our (9.8) 110 Merc had a 2.5 gallon can and the Merc oil came in odd sized cans, not full pints, IIRC. Everyone else used 6 gallon cans, even for the small motors, and called for a pint of oil (or before that, a quart).
I even remember my buddy who had an late 50s/early 60s 5 hp Gale (OMC product, I believe... he used a Johnnyrude can/fittings) mixed up his gas 24:1 with a quart of SAE30 in the can!
They had a big fat Evinrude 75 or 100 of similar vintage (early, but not mid-60s) but I don't know if they were mixing 24 or 50:1.
I don't have memory of any Mercs at the old 24:1 ratio, but I don't go back to the white ones. Just the black ones, and I think it was in '63 or so we got the 650, and then in '66 or '67 we got the 110.. Our 65hp was silver/gold band IIRC, the 110 was definitely red band.
I digress. Slow day.
Tell your friend that all 2 stroke outboards have been 50:1 since - at least - the late 60s, some earlier than that.
