how to mount an outboard??

Discussion in 'Boating' started by rcjoyner, Mar 15, 2008.

  1. rcjoyner

    rcjoyner New Member

    Messages:
    23
    State:
    tn
    We got a 20 ft. long 8 ft wide john boat and need to hang a 90 hp 1996 Mercury ELPTO Bigfoot outboard on it.

    Do you set the horizontal fin (above the prop) slightly below the botton of the boat??

    any advice will be appreciated.

    thanks,

    rob
     
  2. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    That is called an anti-cavation plate and it should be even with the keel or at least 1 inch above the keel.
     

  3. BKS72

    BKS72 New Member

    Messages:
    3,361
    State:
    East of KC
    Bubba, I've wondered about that myself. I thought I read somewhere that too deep reduces RPM. I know that too high invites cavitation/over RPM, but I was wondering if the only effect of setting the prop too deep is a loss of RPM/speed? Thanks,

    Branden
     
  4. cathooked

    cathooked New Member

    Messages:
    437
    State:
    north carolina
    bubba since your here,that timing base on my 75 70hp evenrude that wont go around to the stop,question is,is it suppost to go to the stop.
     
  5. rcjoyner

    rcjoyner New Member

    Messages:
    23
    State:
    tn
    Varifying that you meant to say one inch ABOVE the keel ??
     
  6. AwShucks

    AwShucks New Member

    Messages:
    4,532
    State:
    Guthrie, Oklaho
    Yep, even with or within 1 inch above the keel.
     
  7. CountryHart

    CountryHart New Member

    Messages:
    10,914
    State:
    missouri
    Dang, i better start thinkin of a jack plate since my ole 75 don't have trim. Thanks ya'll
     
  8. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill

    Don at wot it is.
     
  9. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    For every six inches of set back you have on that motor you can raise it one inch above the keel.