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I have a 1964 mercury merc 850 85hp boat motor.

I have a 1964 mercury merc 850 85hp boat motor. will somebody please please tell me what the correct fuel mixture ratio is? I can't find that information anywhere!

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I have the same motor, and the original manual.

The mixture is 50:1. Everything else will destroy your motor. Mercury has a toll free number, call there in case you still have doubts.

Posted on Aug 10, 2010

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Hello! Prior to 1966, Mercury outboards use a 24:1 ratio.

Guru.............Saailer

Posted on May 06, 2010

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Correct, 50:1, glad that someone corrected this incompetent answer. Thanks RobertSt.<br /><br />If you have such a valuable piece of asset (it is the 25th year anniversary model), you better go to sites where people specialize in that kind of stuff, not sites like Fixya. People post cause they don't have anything else to do.<br /><br />At the end, you will only have issues.<br /><br />BTW: I got my manual from Mercury, for free. It has all the essential information in it.<br /> <!-- from fixya rte -->

Posted on Aug 10, 2010

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If you have top quqlity oil 1 liter to 50 liter gas.Don't use syntetic oil! Add some lead substitute additive!Remember in '64 was used only leaded fuel!

Posted on Sep 21, 2011

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I have a mariner 90 hp outboard. The fuel and oil connection to the pump need to be replaced. this is a short line with a 4/5mm off shoot for the oil mix. My problem is I cannot get a replacement. The service shop recommends to put a piece of copper on to it to lengthen it. This I find not acceptable. Can you help. Finbarr.

Posted on Jun 15, 2011

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Posted on Jan 02, 2017

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