Recent content by Teseal

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    1965 3.9hp plug fouls

    I agree, I expect to find some oil floating in there. The quantity is what is concerning me, especially after such short runs. Its not the first 2 cycle I've run in a barrel.
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    1965 3.9hp plug fouls

    That ratio info is pretty interesting. I don't remember the brand of oil just that it's the correct spec, marine, and in a blue bottle. But I don't feel my Yamaha 40 smokes a lot nor all the other 2 cycles I use it in. But you know another thing that concerns me is all the oil in the test barrel.
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    1965 3.9hp plug fouls

    OK so going to run on the J8C for now. Still running way to rich it seems, lots of smoke and oil in the water. Waiting for a service manual now so I can check carb/ign sync and timing.
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    1965 3.9hp plug fouls

    merc850 appreciate the info. For some reason I didn't see your post and got a J8c plug. That keeps it running now but there is still a carb issue I'll need to look into.
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    1965 3.9hp plug fouls

    OK thx much
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    1965 3.9hp plug fouls

    OK so doesn't that also support it being a '66 rather than '65 ???
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    1965 3.9hp plug fouls

    Yeah new pump and prop shaft seal. Guess I should check the ignition even tho it seems to be doing it s thing. The B5HS plug came up in a previous comparison I did. The parts list pic post looks the same as the one posted by iBoats but it lists the L78v plug as only available. So I have 3...
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    1965 3.9hp plug fouls

    All I can tell you is the Mercury SN chart lists it as a 1966. https://www.marineengine.com/mfr/mercury_models.html Either way when I get a chance I'm putting one of the J plugs although not sure which because of all the conflicting info
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    1965 3.9hp plug fouls

    It's a 1966 model 3.9 (39)
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    1965 3.9hp plug fouls

    Here's some before and during some of the service that I just happen to have on my phone. Needed to remove the power head to replace the shift linkage shaft. If you would like something more please let me know
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    1965 3.9hp plug fouls

    Let me try to get some pics for you.
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    1965 3.9hp plug fouls

    Sorry racerone I missed one of your posted questions, I did not look into the ignition because I could get the spark to jump 1/4" as mentioned in my first post.
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    1965 3.9hp plug fouls

    Something I had seen researching made me think it was a '65 but I can't find it now
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    1965 3.9hp plug fouls

    #1885875
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    1965 3.9hp plug fouls

    I mentioned it was Mercury Marine https://www.marineengine.com/parts/mercury-outboard-parts/39-1-cyl/1655013-thru-2498135/flywheelstator-and-ignition-coil-40
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