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24:1 fuel / oil mix. OMC didn't go to 50:1 until around 1962/63. That outboard was equipped with the 2 line pressure tank system. I would update with a fuel pump that they put on some 1958 and all 1959 models so you can run it off any fuel tank if it hasn't already been done.

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15y ago
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Q: What is the fuel mix for a 1957 35 hp evinrude?
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