Logo
Results 1 to 7 of 7
  1. #1

    Default Fouling spark plugs

    My 1972 85 HP outboard fouls the plugs at an idle when I leave the dock. I was told to adjust the the slow speed mixture screws on the face of the carbs but they seem to be adjusted all the way in. Any suggestions or will it be necessary to rebuild the carbs?

  2. #2
    Join Date
    Sep 2010
    Posts
    20,321

    Default Re: Fouling spark plugs

    Well, they should not be all the way in !!------What do you mean when you say " it fouls the plugs when you leave the dock " ??------Does the motor stall ?---Have you removed and examined the plugs ?---Any real trouble shooting done ?----Gas and oil mixed at 50:1 on this motor ?

  3. #3
    Join Date
    Jun 2013
    Location
    Duluth Mn
    Posts
    3,193

    Default Re: Fouling spark plugs

    Does this motor have fixed low speed jets? Then those screws are just caps.....aren't they? Maybe I'm thinking about another model.....dah!

  4. #4

    Default Re: Fouling spark plugs

    After I leave the dock it takes a little while for the motor to come up tp speed, when I idle it down ot starts running rough. When I came back to the dock the motor stalled. We took the plugs out and they were black. Haven't done any real trouble shooting, I mix the gas and oil 50 to 1.

  5. #5

    Default Re: Fouling spark plugs

    I'm not sure if they are caps or not, I didn't try taking them all the way out.

  6. #6
    Join Date
    Jun 2013
    Location
    Duluth Mn
    Posts
    3,193

    Default Re: Fouling spark plugs

    It could be that if its running this rich, the fuel pump is leaking into the crankcase. This would be better for you because the carbs are likely okay. Has this motor been exposed to ethanol fuel? That is the "kiss of death" for these fuel pumps.

  7. #7
    Join Date
    Jun 2013
    Location
    Duluth Mn
    Posts
    3,193

    Default Re: Fouling spark plugs

    So what did you find, brother?

Similar Threads

  1. 96 Johnson 130 fouling spark plugs
    By boutano1000 in forum Johnson Evinrude Outboard Forum
    Replies: 6
    Last Post: 06-02-2018, 06:07 PM
  2. 1988 Johnson 150HP V6 fouling spark plugs
    By mstahl1171 in forum Johnson Evinrude Outboard Forum
    Replies: 2
    Last Post: 06-19-2015, 09:19 PM
  3. 1987 Johnson 140 hp VRO Fouling Spark Plugs on Initial Start
    By gac in forum Johnson Evinrude Outboard Forum
    Replies: 20
    Last Post: 04-17-2011, 08:12 PM
  4. 60HP Evinrude fouling spark plugs
    By stevennobile in forum Johnson Evinrude Outboard Archive
    Replies: 1
    Last Post: 04-17-2006, 09:29 PM
  5. Spark Plugs fouling 86 OMC
    By John Barnes in forum Johnson Evinrude Outboard Archive
    Replies: 3
    Last Post: 01-13-2004, 12:11 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •