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Want to know what the gas / oil ratio is on a 1973 4 hp mercury motor. s/n 3657708

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The fuel ratio is 50 to 1. Fuel/oil.You can go as low as 40 to 1 fuel/oil.40 to 1 is the richer mix.Hope this helps

Posted on Oct 05, 2009

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Fuel mix ratio for outboards


that depends on the age of the motor .if erroring it's better to have too much oil than noot enough sine that can seize an engine up

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


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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.

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I need to find out gas to oil ratio on 6.5 hp craftsman lawn mowe


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