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  1. #1
    Cadet
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    May 2007
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    Smile Fuel Mixture 1986 classic 50 Mercury

    Hi Guys,i am trying to find the fuel mixture for my 50hp mercury. The serial number i have. #9456469. i believe it is 100:1 although i have also been told 50:1. I assume it will foul the plugs if it has too much oil in the fuel.

  2. #2
    Vice Admiral bhile's Avatar
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    Feb 2004
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    Chesapeake, Va
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    Default Re: Fuel Mixture 1986 classic 50 Mercury

    50:1
    "A manual is a cheap investment"
    Fair Winds and Following Seas
    Bill
    PTC USN ret

  3. #3
    Admiral j_martin's Avatar
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    Isanti, MN
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    Default Re: Fuel Mixture 1986 classic 50 Mercury

    The merc ignition is so strong it takes about 20:1 and idling to foul plugs.

    100:1 will make scrap out of it in a hurry.

    All normal mercs (fishin' motors) less than 30 years old take 50:1. Some are VRO (they mix it at a variable rate) and some racing stuff needs more oil.

    hope it helps
    John

  4. #4

    Default Re: Fuel Mixture 1986 classic 50 Mercury

    Hi

    Can anybody help. I have a Classic 50 Mercury engine serial number 9451519. I am looking to find year of manufacture to enable me to get a manual.

    P thomas

  5. #5

    Default Re: Fuel Mixture 1986 classic 50 Mercury

    it may be too late, but here you go:

    http://stores.ebay.com/Outboardnuts/...ar-Lookup.html

  6. #6
    Cadet Registered
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    Jun 2010
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    Default Re: Fuel Mixture 1986 classic 50 Mercury

    All:

    I have what I believe to be a 1986 50 HP Merc on an 18' Eastern. Boy is it noisy. Would like to re-engine, but weight is an issue/ Can anyone tell me what that 50 HP (3 cyl) weighs?

  7. #7
    Chief Petty Officer
    Join Date
    Apr 2009
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    511

    Default Re: Fuel Mixture 1986 classic 50 Mercury

    a 4cyl classic fifty weighs 245 .

  8. #8
    Cadet Registered
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    Jun 2010
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    Default Re: Fuel Mixture 1986 classic 50 Mercury

    I think that the motor I have is 3 cylinder, but I could be mistaken -I will check when I go to where the boat is this weekend. If that were the case, then I presume it would be lighter than the 4 cyl.

    Given the floatation and the location of self bailers in the old Easterns, weight is an issue. Evinrude and Tohatsu are about 320#

    Thanks for the reply.

  9. #9
    Cadet
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    Aug 2011
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    Lone Oak, Texas
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    13

    Default Re: Fuel Mixture 1986 classic 50 Mercury

    I have a 1976 50 HP mercury....4 cylinder engine...
    Do I use 16 oz. For 6 gallons of gas..
    I have to advance my idle to get the engine started ...
    Should I add Berryman's B-12 for carb cleaning

  10. #10
    Cadet
    Join Date
    Aug 2011
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    Lone Oak, Texas
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    Default Re: Fuel Mixture 1986 classic 50 Mercury

    Quote Originally Posted by Davidmoody View Post
    I have a 1976 50 HP mercury....4 cylinder engine...
    Do I use 16 oz. For 6 gallons of gas..
    I have to advance my idle to get the engine started ...
    Should I add Berryman's B-12 for carb cleaning
    Should I adjust cable linkage in the engine

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