1957 Evinrude 18 HP Fastwin

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  • April 4, 2026 at 10:04 pm #314041
    RICHARD A. WHITE
    Participant

      Lifetime Member

      Jay, no worries, just remember, save the pressure tank, refurb it and use it for your next 30 OMC’s

      http://www.richardsoutboardtools.com
      classicomctools@gmail.com

      April 4, 2026 at 10:06 pm #314042
      seakaye12
      Participant

        US MEMBER PAY BY CHECK

        Well the flywheel will probably survive with some sanding.  With the flywheel upside down on the table….place a typical screwdriver against the magnets.  It should stick firmly.   A simple test of the magnets.

        I hope you did not use the Chinese coils.  Sometimes they are OK but I’ve found that they many times are weaker than the genuine OMC coils or CDI brand coils.  Takes a good yank of the rope to get them to fire strong.

        You certainly still have issues;  hard to diagnose remotely .  Have you looked at the crankcase seals?  Top and bottom?

        EDIT:  I just watched your video.  The wobble is pretty typical;  not your issue.  And I see those genuine OMC coils too…..the search goes on!  Those carburetor images that Jacques posted are important.  The idle circuit may be plugged;  you can revisit the carburetor at some point.  

         

        April 4, 2026 at 10:24 pm #314044
        JACQUES
        Participant

          coils must aling with the base. run your fingernail up and own it must not snag.

          that done if you have no spark assuming notoing wrong magnet wise then  coil or condensre are suspect.

          did use measure/test/ replacethe condensers ??

          what ohms do you see on both lower and upper coil s    measure secondary  Ohms values to compare from boot clip to engine frame frame and report findings.    Some coils have 9 kohms  some have 4 kohms… if need be install similar coils or swap parts to see if the problem follows the parts .  CLEAN CLEAN the points

          What compression numbers do you have top and bottom…report findings !  your engine should idle fine ans  start at START  . is your  cam adjusted  with the cam follower  on the car  so it sits on the mark at START

           

          got the bible ??  all you need to know !

          download and store locally  or print localy and bind

          https://www.socalaomci.com/library/johnson_service_manual_10th_edition.pdf

           

           

           

          Joining AOMCI has priviledges 🙂

          April 4, 2026 at 10:33 pm #314050
          JACQUES
          Participant

            btw  proper idling  gets fuel fed up the carb  via the side channel to the the top drip chamber (3 small holes)  if the throttle   is open to much …… crankcase suction will be shared betwenn the HS fuel circuit and the LS circuit  which may no tbe favorable to idle . At slow idle  the trotlle plate should be closed and fuel come from the top of the carb not the center HS post.    See manual  for operation  and  adjustments .

            Never-give-up

            Joining AOMCI has priviledges 🙂

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