Johnson motor wont start
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  1. #1
    Senior Member
    Join Date
    Mar 2007
    Posts
    492

    Johnson motor wont start

    Hello..
    just bought a boat came with a 70hp Johnson (1977 model)
    but unfortunately the motor is hard to start.. I must spray starting fluid otherwise it wont start, I just remove and clean all 3 carburetors, replace and seals, replaced all spark plugs, changed new fuel line and also new fuel pump to.. but still the same..
    so does anyone know how to fix it..please I need help..
    Thank you
    XxThunderxX

  2. #2
    Senior Member
    Join Date
    Apr 2010
    Posts
    322
    This is a good place to ask questions like yours.
    https://forums.iboats.com/forum/engi...nd-maintenance
    However, be prepared to provide s/ns etc. These guys will want details.
    My own opinion is that it may be the choke mechanism or fuel pump. These old school 2 stroke motors are notoriously fussy about cold starting but once you figure out the proper sequence they are great. I've got a merc version and as long as I choke it hard at the beginning its great.

  3. #3
    Senior Member
    Join Date
    Jun 2014
    Location
    Pflugerville
    Posts
    305
    Forgive me for I just can’t resist.

    Quote Originally Posted by Donf View Post
    as long as I choke it hard at the beginning its great.
    That is what she said.
    Last edited by langlowe9; 06-22-2018 at 07:33 PM.

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  5. #4
    Junior Member
    Join Date
    Feb 2014
    Posts
    5
    Clean the carburetors. Not that hard to do. We had that problem with a 60HP Mercury and cleaning the carbs did the trick.

    https://www.youtube.com/watch?v=RaBu_OQHD3o

    https://www.youtube.com/watch?v=mk21aSQdX40

 

 

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