Reply To: ’57 Evinrude 7.5 fleetwin fuel mix

[Mumbles]

The 5.5 horse motors didn’t get needle bearings on the big end of the rod until 1961 so 1960 and older 5.5 motors with plain bearings will need the 16:1 mix. ’61 and later called for 24:1 until 1964 when everything went to the standard 50:1 mix although I think it is safe to assume the ’61 – ’63 motors could use and survive on 50:1 as they are mechanically identical inside as the later 50:1 six horse motors which were built thru 1979.