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  1. #1

    Default Oil Fuel Mixture for 1988 Johnson 15 HP

    I have inherited a Johnson Sea Horse 15 hp outboard motor which I think it is a 1988 model. The model number is AJ15BACCS with a serial number of A07603820. On the body of the cowling there is a suggested fuel/oil ration of 100:1. Can anyone tell me if that is correct or what ratio should I use?

  2. #2
    Join Date
    May 2008
    Location
    Kent, the garden of England, UK
    Posts
    1,150

    Default Re: Oil Fuel Mixture for 1988 Johnson 15 HP

    It is indeed a 1988 model ( CC = 88) You should be running on a 50:1 fuel mix.
    OMC switched to 100:1 fuel mixtures in 1985 for a few years. This was found to be a mistake and they soon switched back to 50:1. The 100:1 decals should have been removed long ago and the handbook amended also.

    The initial "A" I think means it is Australian made

    "BA" indicates a rope start model with an AC lighting coil fitted as standard
    Last edited by vics; 11-03-2010 at 02:26 PM.

  3. #3

    Default Re: Oil Fuel Mixture for 1988 Johnson 15 HP

    Thanks Vics much appreciated. I take it that the ac lighting coil has something to do with the small rubber grommet/flap on the side of the engine.

  4. #4
    Join Date
    May 2008
    Location
    Kent, the garden of England, UK
    Posts
    1,150

    Default Re: Oil Fuel Mixture for 1988 Johnson 15 HP

    Quote Originally Posted by purryburry View Post
    Thanks Vics much appreciated. I take it that the ac lighting coil has something to do with the small rubber grommet/flap on the side of the engine.
    Yes but I cannot be sure if that model will have a three wire output or a two wire output.

    If two wires then no problems it is just an AC output insulated from ground.

    If it is a three wire output then the load has to be connected as in my diagram below to the yellow, yellow blue and yellow grey wires
    Also there how to connect a rectifier for battery charging.
    There is a plug in kit also if required for battery charging.


  5. #5

    Default Re: Oil Fuel Mixture for 1988 Johnson 15 HP

    Great info thanks Vic. Can you get manuals online for these motors or do you have to purchase them? I have found a couple of sites but you have to pay to join.

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