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  1. #1

    Default 1998 force 75 hp 2 stroke chocolate milk coming out of exhaust

    Hello all
    So my engine started "surging" about 150 rpm at WOT and Im down 4-6mph at top speed. I changed fuel line, filter and pulled carb and cleaned very well.
    I went out and ran it again still same problem. Only ran at WOT for 5 miles and when I pulled the boat this time I had chocolate milk colored sludge pouring out of the exhaust on back of engine. Nothing coming out of prop though.
    Im kinda leaning twords head gasket but I have no water on plugs that I can tell. Im really just looking at a place to start troubleshooting and any other advice is greatly appreciated.
    Thanks in advance.

  2. #2
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    14,501

    Default Re: 1998 force 75 hp 2 stroke chocolate milk coming out of exhaust

    Compression test needs to be done.----Checked fuel pump diaphragm ?----Thermostat checked ?

  3. #3

    Default Re: 1998 force 75 hp 2 stroke chocolate milk coming out of exhaust

    Im getting a compression tester this morning.
    Have not checked anything yet. This just happened yesterday so Im jumping on it today. What should I look for in the pump? the motor pumps water well but I will inspect the thermostat as well.
    Thank you

  4. #4
    Join Date
    May 2010
    Location
    Sebastian ,Fl
    Posts
    2,437

    Default Re: 1998 force 75 hp 2 stroke chocolate milk coming out of exhaust

    Compression results?
    88 Bayliner with 2002 225 HP Mercury EFI

    Buy American made Cars and Trucks!!!Towing insurance for a boat,a GREAT thing.
    ​Tools to make my life easier: Battery tester, die grinder, temp.gun, compression tester, DVA meter.

    In Scenic , Beautiful San Sebastian by the sea Florida

  5. #5

    Default Re: 1998 force 75 hp 2 stroke chocolate milk coming out of exhaust

    Compression checked perfect 125-127 psi on all 3 cylinders.
    It wound up being the diaphram in the fuel pump broke and was sucking extra fuel into the engine and pouring raw fuel from the exhaust.
    I rebuilt the pump and all is well!!!
    Thanks

  6. #6
    Join Date
    May 2010
    Location
    Sebastian ,Fl
    Posts
    2,437

    Default Re: 1998 force 75 hp 2 stroke chocolate milk coming out of exhaust

    Glad it works.
    88 Bayliner with 2002 225 HP Mercury EFI

    Buy American made Cars and Trucks!!!Towing insurance for a boat,a GREAT thing.
    ​Tools to make my life easier: Battery tester, die grinder, temp.gun, compression tester, DVA meter.

    In Scenic , Beautiful San Sebastian by the sea Florida

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