1958 envinrude 35 HP big twin running rough

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This topic contains 25 replies, has 10 voices, and was last updated by olcah olcah 1 month, 3 weeks ago.

Viewing 11 posts - 16 through 26 (of 26 total)
  • frankr
    frankr
    US Member - 1 Year
    Replies: 4052
    Topics: 43
    #154662

    J6 is the correct plug. IF, IF it is sucking water, my first go-to would be the exhaust cover plate on the side of the powerhead. They develop pin-holes through it. Carbon seals are sneaky, you usually don’t have any clue on those till it’s too late. You can access the cover by removing the lower cowling pans.

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    fleetwin
    US Member - 2 Years
    Replies: 2564
    Topics: 29
    #154760

    I realize it is winter in most locations…But, is there anyway you can post a video of the engine running?

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    rvdriver

    Replies: 30
    Topics: 6
    #154785

    Fleetwin: I tried to post a video but the site only allows 512 KB. I can’t even get 2 seconds of it to upload. I could send an email to you. I am in Texas and it’s 74 here today. I shot the video day before yesterday.

    Thank you for your help!

    Steven

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    fleetwin
    US Member - 2 Years
    Replies: 2564
    Topics: 29
    #154855

    Steven
    Send the video to me at:
    dkellogg56@gmail.com
    Don

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    rvdriver

    Replies: 30
    Topics: 6
    #154892

    I sent the video this evening. Thank you!

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    fleetwin
    US Member - 2 Years
    Replies: 2564
    Topics: 29
    #154980

    Got the short video….Couldn’t tell if the engine was running on only one cylinder, it was at dead idle….Just sounded very rich….Will forward the video to whoever else wants to watch/listen…D

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    rvdriver

    Replies: 30
    Topics: 6
    #155727

    Thanks for all the feedback thus far. We are attacking this all on Friday. The fuel tank is the double pressure original line. Installing new plugs and checking the points. We think it’s still running too rich.

    Steven

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    rvdriver

    Replies: 30
    Topics: 6
    #158625

    My good friend Greg Schneider came over this past Sunday and we worked on the Evinrude.

    We checked the plugs and did a spark test and found that was ok. Since we just rebuilt the carburetor and checked the fuel filter and the pressurized tank was recently overhauled, we turned our attention to the ignition.

    We pulled the flywheel and checked the points and checked the gap. Upon further inspection, Greg noticed that one of the condenser mounting screws was very lose. We used blue locktite and put it all back together. I had purchased new plugs, but we installed the old ones to check them.

    The engine fired right up and ran smooth. We took it out on the lake and it ran perfect after a few small mixture tweaks.

    I have access to aviation fuel (I work at an airport and own an airplane), so I made up a tank and took her out for another test ride yesterday and she ran great.

    Thanks for all the great help and advice!

    NOTE: Any idea where I could obtain an owners manual for the 1958 Evinrude 35 HP Big Twin?

    Best Regards,

    Steven

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    fleetwin
    US Member - 2 Years
    Replies: 2564
    Topics: 29
    #158857

    Great news Steve, I’m glad the solution was a simple one….Keep en eye on ebay for a 58 Bigtwin manual, I see them from time to time. Perhaps someone in AOMCI has one also, post an add in the classifieds…

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    rvdriver

    Replies: 30
    Topics: 6
    #172327

    I thought I updated this thread. The cause was a lose condenser that was not grounded properly causing an intermittent firing.
    Thanks for all the great help!

    olcah
    olcah
    US Member - 1 Year
    Replies: 308
    Topics: 67
    #172342

    comment deleted.

    • This reply was modified 1 month, 3 weeks ago by olcah olcah.
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