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Results 1 to 8 of 8
  1. #1

    Default fuel mixture on johnson 25hp outboard

    I have an old Johnson 25hp outboard motor and don't know the mixture. I also don't know what year it is. Where is the model and serial no.? Thank you

  2. #2
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    9,626

    Default Re: fuel mixture on johnson 25hp outboard

    Describe how the cowling comes off this motor.----2 piece metal cowling with screws / metal cowling that hinges in the middle / one piece cowling with a latch at the back??????
    Last edited by racerone; 07-11-2012 at 12:17 PM.

  3. #3

    Default Re: fuel mixture on johnson 25hp outboard

    one piece cowling with a latch at the back.

  4. #4
    Join Date
    Oct 2011
    Location
    maplevalley WA
    Posts
    7,593

    Default Re: fuel mixture on johnson 25hp outboard

    under the front of the motor on the swivel bracket should be the ID plate more than likely 50:1 mix will be fine use good marine outboard specific oil. Post a pic of the motor and we can narrow it down if you cant find the model number.

  5. #5

    Default Re: fuel mixture on johnson 25hp outboard

    I believe I have the right ID tag as you instructed. I hope these are the right numbers. Model 25R76E Serial E4436325. Thank you for helping me.

  6. #6
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    9,626

    Default Re: fuel mixture on johnson 25hp outboard

    1976 model and you mix at 50:1

  7. #7
    Join Date
    Jun 2009
    Location
    peru, il, usa
    Posts
    4

    Default Re: fuel mixture on johnson 25hp outboard

    I have a 1997 40 hp. Evinrude always ran fine un til this last fishing trip ,had problems with the motoer bogging down but would stat back up, after new plugs and fuel filter and put preiem gas in it and ran fine the rest of the trip anybody else run into this problem with eythenol gas

  8. #8
    Join Date
    Oct 2011
    Location
    maplevalley WA
    Posts
    7,593

    Default Re: fuel mixture on johnson 25hp outboard

    I was probably a slug of water that cleared itself in the process ethanol will pull moisture out of the ambient air more than regular fuel especially if the tank has benn sitting low on fuel for a while the rise and fall of the barometer will draw moisture into any vented tank as it breathes. Keeping the tank full will eliminate that.

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