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  1. #1

    Default Dirty spark plugs 1976 75 hp

    Hi all

    I have a 1976 75 hp Chrysler, my spark plugs are getting very dirty quite quickly and will only run for a day or two then will conk out. but with new sparkys it will run fine again.

    Any suggestions as to why?

  2. #2
    Join Date
    May 2010
    Location
    Sebastian ,Fl
    Posts
    3,125

    Default Re: Dirty spark plugs

    Possibly too much oil in the gas.That motor needs to run 50-1. 1 pint oil to 6 gal.
    That OK then reset the air screw.Top front of carbs.Screw in till it just bottoms out.Then out 1 turn.
    You need to have it in the water,in gear and the motor warm to do final adjustment.
    Turn in the screws(one at a time)till the motor just starts to miss/cough or stutter. Then out 1/2 turn.Do this on all three.Give it a few seconds to catch up between adjustments.Rev it up between carbs.
    How old is the diaphram?Replace it if it's older than a year.J
    PLEASE,NO PERSONAL MESSAGES IF THE QUESTION CAN BE ASKED ON THE OPEN FORUM
    88 Bayliner with 2002 225 HP Mercury
    Buy American made Cars and Trucks!!!Towing insurance,get it.
    In Scenic Beautiful Sebastian by the sea Florida

  3. #3

    Default Re: Dirty spark plugs

    Thanks for the info.
    The ratio i use is 1:50, and i will try the air screws on the carby.
    Sorry about the lack of knowledge but what is the diaphragm and where is it located.

  4. #4
    Join Date
    Sep 2010
    Posts
    20,978

    Default Re: Dirty spark plugs

    Is the motor warming up ( thermostat in place if equipped with one )---------------------Fuel pump diaphragm should be checked as well.---------------------Will spark jump a gap of 5/16" or better.

  5. #5
    Join Date
    May 2010
    Location
    Sebastian ,Fl
    Posts
    3,125

    Default Re: Dirty spark plugs 1976 75 hp

    Diaphragm is in the fuel pump.Thermostat is located on the top of the head above the plugs.
    Get a manual and fill out the profile,you might be close to someone who can help.J

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