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  1. #1
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    Jul 2011
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    Mansfield
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    1990 johnson 120- what pitch prop and max rpm

    I have an 1990 Ranger 370v bass boat 18ft with a johnson 120 what rpms should boat run and what pitch prop should I run. I also took the oil injection pump off and put a electric fuel pump on it that comes on when key is on but now have a problem with motor loading up at idle but runs fine going across lake. Any suggestion would be great...Thanks

    M-j120tlasb
    S-g2495140
    120 hp Johnson outboard<br /><br />
    Modified by eric1980 at 5:23 PM 7/2/2011


    Modified by eric1980 at 5:34 PM 7/2/2011

  2. Moderator SEAHORSE's Avatar
    Join Date
    Jun 2004
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    9,638
    #2

    Re: 1990 johnson 120- what pitch prop and max rpm (eric1980)

    get rid of the electric pump, those can give problems plus be very dangerous. You can always use your old pump as a fuel pump and just block off the oil pump part of it.
    -----


    A Technical troubleshooter possessing more tools than talent !

  3. Member
    Join Date
    Apr 2010
    Location
    Murfreesboro
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    198
    #3

    Re: 1990 johnson 120- what pitch prop and max rpm (SEAHORSE)

    rpm range is 5000-6000...I'd prop it to turn 5300-5700
    Todd Savage
    '93 Javelin 363 FS
    '82 115 Johnson

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