gas/oil ratio?

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crankbait09

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I recently purchased my first "new to me" jon boat. It came with an 18hp, Evinrude Fastwin motor.
Serial number 18602C-E13878

Could anyone please tell me the fuel/oil mixture ratio?

Thank you
 
I believe that's a 1966 with 50:1 mix.

This came off their site:

The following is generally true: 1958 and prior used 20:1, 1959 thru 1963 used 24:1, 1964 and newer use 50:1. High performance usage (racing) requires a ratio of 25:1. New engine break-in (not DI) requires 25:1.
 

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