Search results

  1. T

    1965 3.9hp plug fouls

    Something I had seen researching made me think it was a '65 but I can't find it now
  2. T

    1965 3.9hp plug fouls

    #1885875
  3. T

    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
  4. T

    1965 3.9hp plug fouls

    The Champion L78v is listed in the parts list I have, it superseded three other plugs no longer available. I mentioned that the motor had a J style plug in it when I picked it up but it was not the J8C. I threw the original plug in the box of used plugs I have and could not find a J8C in the...
  5. T

    1965 3.9hp plug fouls

    Regarding the plug let me tell you why I bring that up. It was a bunch of years ago I had a 1977 150 Merc inline and I'm not a ramming around the lake type boater, more the fisherman type boating so that 150 was getting more lower rpm running than normal. Plugs, at the time were the center...
  6. T

    1965 3.9hp plug fouls

    Sorry didn't see your post regarding the cover, think its important with the compression test?
  7. T

    1965 3.9hp plug fouls

    As my Dad use to say, "where there's a will there's a way". I could run the compression hose thro the air intake after removing the screen and filter. So after 4 or 5 quick pulls of the starter rope we were up to 98psi. Thinking that's enough to keep this thing out of trouble.
  8. T

    1965 3.9hp plug fouls

    I have not checked the compression. Not sure how I would do that because the rope starter is in the cover, no access for the tester thro the cover. Guess I could see about putting/enlarging a hole through the bottom casting for the gage line. About 2 minutes at a fast and slow idle, in gear...
  9. T

    1965 3.9hp plug fouls

    Tillotson carb needle base to upper level spec was off a bit .060" rather than spec @ .040". Thought this maybe enough to enrich the fuel so didn't go any further after making float measurement and tried again. Started OK whole lot less smoke, maybe ok, still sputtering. Shut it down to...
  10. T

    1965 3.9hp plug fouls

    Replaced the diaphragm and gasket. Didn't find any ruptures or pin holes even in front of the light. Recalled I had the carb set what I thought was way to lean, actually it was a turn and a qtr. Started 2nd pull with choke, smoking like crazy, let it run longer than it had in the past when it...
  11. T

    1965 3.9hp plug fouls

    Got it, thx again
  12. T

    1965 3.9hp plug fouls

    OK thx, will do but wonder how the pump effects it?
  13. T

    1965 3.9hp plug fouls

    This little 3.9 hasn't been run in probably 25 years. I did some maintenance on it and tried to bring it back to life. My surprise it popped off about the second pull but didn't run more than 10 seconds and died. I should have replaced the gas line tank/motor that I think created the black...
  14. T

    1965 Merc 3.9hp Has a Hole in the lower casting

    Looks like its good to go, Thx to you both for your time and attention.
  15. T

    1965 Merc 3.9hp Has a Hole in the lower casting

    Yes racerone, I replaced the prop shaft seal because I found water in the gear box. Wasn't aware of the drain hole thx Starflite. For sure tho I will check the oil after I run it for awhile.
  16. T

    1965 Merc 3.9hp Has a Hole in the lower casting

    Just finished up working on this little Merc getting ready to finial test and noticed the small hole in the lower casting just above the gear box. Anyone have any idea how, why, or what? It's such a round, clean hole can it possibly be a bad spot in the casting just rotted through?
  17. T

    Force 75 threw a magnet at us

    Follow up: Had the 75 out on the lake the other day to see where we were at. It was unusual that it didn’t start right away but it wasn’t the problem. The starter was dropping out as soon as the motor would pop the starter gear dropped, the starter would continue to spin but the gear was not...
  18. T

    Force 75 threw a magnet at us

    If I remember right the idle mix screw is set about 1/2 turn. Before replacing most of the electronics one of the symptoms was the idle mix had very little effect on the idle until it was just about closed. It does have more influence now but the 1/2 turn was the best results. Didn't like it...
  19. T

    Force 75 threw a magnet at us

    MERRY XMAS ALL ! Ok Redbarron I follow that, you suggest something with the carb idle ckt? The single carb has been removed and cleaned, but I can check it again. The darn motor is running smoother so leaning towards a mechanical situation. That's another reason I felt the new (used) flywheel...
  20. T

    Force 75 threw a magnet at us

    Finally got some decent weather to test the 75. Put in the new (used) flywheel and stator and tested on the hose. I did not see a difference, very rough idle, rpm oscillating a bit, with vibration (so that eliminates the flywheel balance I suspected), noticeable miss from idle to about 2.5K...
Top