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  1. #1
    Cadet
    Join Date
    Mar 2010
    Posts
    12

    Default motor change= listing left

    i just changed outboard motor on my boat. went from 1969 55hp johnson to a 1971 100hp evinrude and now it lists badly to the left, have adjusted trim tab fully to the right as it was pulling right without much change. when i pulled the 55 off there were two fender washers between transom and starboard side of mount,should i put them back under there? any help please

  2. #2
    Petty Officer 1st Class
    Join Date
    Aug 2009
    Location
    Tampa Bay, FL
    Posts
    205

    Default Re: motor change= listing left

    Is it listing while sitting still or only when under way?
    93 Starcraft Eurostar 17' Bow Rider, 96 Mariner 115hp outboard
    01 Ford Expedition 4.6

  3. #3
    Cadet
    Join Date
    Mar 2010
    Posts
    12

    Default Re: motor change= listing left

    listing only underway, would listing left make it pull right. checked this morning and cavitation plate is fush with bottom of boat.motor had hydra-foil on it before mounting on this boat, could putting it back on help? boat is a 1976 crestliner nordic 17.

  4. #4
    Supreme Mariner
    Join Date
    Mar 2004
    Location
    On Barnegat Bay, NJ
    Posts
    17,570

    Default Re: motor change= listing left

    Right hand props provide torque to the left. This can cause some listing. other than that, check the hull with a straight edge to make sure it is true.

    I suppose it is possible that the hull could deform under power, causing the list.

  5. #5
    Cadet
    Join Date
    Mar 2010
    Posts
    12

    Default Re: motor change= listing left

    re-read my first post, the two fender washers sat on top of the transom under the starboard side of mount.

  6. #6
    Supreme Mariner
    Join Date
    Apr 2002
    Posts
    16,757

    Default Re: motor change= listing left

    I don't see how fender washers could change anything.Take a hold of the motor and shake it front to back and observe the transom.Accellerate briskly and watch the transom for flex.Is the boat rated for 100 hp?I don't think the foil will help I would only use it in desperation.
    Is the steering wheel(helm) on the right(starboard) side?What size prop?
    Does the list start right away or only when you approach above the 55s speed?
    Have you tried adjusting the trim.Does the boat get up on the water or does it seem to lay down like its glued to to the surface?

  7. #7
    Cadet
    Join Date
    Mar 2010
    Posts
    12

    Default Re: motor change= listing left

    helm is on starboard side. boat rated for 120hp. transom does have a slight amount of flex when i shake it. not sure of prop size as i cant find stamping stateing size there ia a number on rear face of inner hub but i dont know to crossreferance to dia and pitch, but it is underproped as i am only getting 4200rpm at wot. am going to try a 13 3/4x 15 prop tonight. boat is not getting up on water as well as it should. have not adjusted trim just trim tab. will try this tonight also, should i trim up or down?

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