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Results 1 to 6 of 6
  1. #1
    Join Date
    Apr 2011
    Location
    Chesapeake VA
    Posts
    28

    Default what size prop do I need 1972 50 hp Johnson

    Im running a 12 3/4" x 21 prop on a 50 HP Johnson I have this on a 16' simmons sea skiff. It revs up in neutral but wont rev up in gear. This motor
    runs great until I put it in gear. It seems like ist moving kinda fast at idle. But not sure what els to look for ?

  2. #2
    Join Date
    Dec 2009
    Location
    Pickering and Lakefield, Ontario, Canada
    Posts
    666

    Default Re: what size prop do I need 1972 50 hp Johnson

    Is the problem something new? Did the boat and motor combination work ok before?

  3. #3
    Join Date
    Apr 2011
    Location
    Chesapeake VA
    Posts
    28

    Default Re: what size prop do I need 1972 50 hp Johnson

    No Bill I just put this motor on this boat and I have only run this motor in a drum.

  4. #4
    Join Date
    Dec 2009
    Location
    Pickering and Lakefield, Ontario, Canada
    Posts
    666

    Default Re: what size prop do I need 1972 50 hp Johnson

    If the motor is running ok, I'd say your prop has way too much pitch. I run the same motor with a 17" pitch prop on a 15 foot f/g boat. Runs about 30 mph, turning 5,000 rpm. I tried a 21" pitch, just because I had one. The boat wouldn't even plane out.

  5. #5
    Join Date
    Apr 2011
    Location
    Chesapeake VA
    Posts
    28

    Default Re: what size prop do I need 1972 50 hp Johnson

    Thanks Bill I will try a 17" I'll post the outcome. Thanks again.

  6. #6
    Join Date
    Dec 2009
    Location
    Pickering and Lakefield, Ontario, Canada
    Posts
    666

    Default Re: what size prop do I need 1972 50 hp Johnson

    Yeah, let me know if that works.

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