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  1. #1
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    Black exhaust soot on prop?

    Here is a picture of my 2017 150 Pro SX lower unit. Is this amount of black soot on the prop normal? I’m running a 21 Trophy, spinning it 5600 at WOT, 54 mph on a RT 198P. 62 hours on the motor. Serial# 2B230027, Family GM9XM02.52C3
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    Last edited by kacordy; 04-15-2021 at 07:47 PM.

  2. Member
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    #2
    do a lot of ideling ??? what aditives ya running ???? looks lil heavy but yes you will notice some
    .................................................. ...the scariest thing in life is the unknown ...................................

  3. Member
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    #3
    Which 150 ProXS, Optimax or 4-stroke? Please include serial number as well (required when posting).

    If Optimax, post here - Mercury - 2.0/ 2.4/ 2.5 Liter High Performance

    If 4-stroke, post here - Mercury - 4 Stroke / Verado
    _______

    Phil
    '09 Hewescraft ProV
    '09 150 Optimax


  4. Member
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    #4
    Quote Originally Posted by SilverFox579 View Post
    Which 150 ProXS, Optimax or 4-stroke? Please include serial number as well (required when posting).

    If Optimax, post here - Mercury - 2.0/ 2.4/ 2.5 Liter High Performance

    If 4-stroke, post here - Mercury - 4 Stroke / Verado
    I apologize, I will get the serial number tonight. This is the 150 2 stroke Optimax. I do run the Quickleen and I will verify the other ethanol stabilizer I use. Im running good ole California 87 pump gas with ethanol. I’m only idling it out of the marinas 5mph zones. Normal driving from one fishing location to another. I do run it WOT all the time at 5600. Most of my runs are 20-30 minutes to my first fishing spots. Thank you for the help and feedback, Allen

  5. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #5
    If you're running Optimax/DFI Oil (the recommended oil) and the Quickare/Quickleen cocktail, your prop really should not look like that.

    Check and make sure you don't have a 1/4" gap all the way around that prop (ie: Prop barrel smaller than gearcase bore).

    Moving your thread to the 2.5L Forum for you. Be sure to update Post#1 with the serial number.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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    #6
    I updated post #1 with serial number and engine family.

  7. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #7
    Double check your serial number... as it's not matching a 150.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

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    #8
    Quote Originally Posted by EuropeanAM View Post
    Double check your serial number... as it's not matching a 150.
    I will check, I questioned myself also. I think the first two 2’s are actually Z’s. I will take a closer look and verify. Thanks, Allen

  9. Member
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    #9
    Serial number will be formatted digit, letter, 6 digits...

    Prop barrel definitely looks smaller than bore diameter allowing exhaust to flow outside the prop vs inside.

    Another thing, the Optimax runs cleanest between 3400 and 4800rpm.
    _______

    Phil
    '09 Hewescraft ProV
    '09 150 Optimax


  10. Scraps
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    #10
    Would also check your plugs.
    2017 Phoenix 819
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