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  1. #1
    Cadet
    Join Date
    Feb 2007
    Location
    Centerville, IA
    Posts
    6

    Default 76 85 HP Johnson Javelin V4

    The engine has been gone thru by a dealer. All compression is good and supposedly has had a carb rebuilt done to it. My Question? after having the engine warm, when idling down, like going thru the harbor, it will eventually load up and die., Sometimes it starts right away, other times I need to rechoke it and then it starts. Also after idling down, it seems to have a higher idle rpm for a minute or two but the makes a "popping noise" then idles down, it may keep running but sometimes also dies? Any advice? Could it be a fuel line problem, like not keeping enough pressure?
    Thanks.
    IASLAB

  2. #2
    Seaman Apprentice Timmstng67's Avatar
    Join Date
    Sep 2007
    Posts
    33

    Default Re: 76 85 HP Johnson Javelin V4

    Is it popping back Through the carbs? My 77 140 was popping back through the carbs and it ended up being the reeds. Don't know if this helps but thought I would throw that out there.
    1975 Baja with a 1977 140 Johnson V4

  3. #3
    Captain iwombat's Avatar
    Join Date
    Jul 2006
    Location
    North Bend, WA
    Posts
    3,759

    Default Re: 76 85 HP Johnson Javelin V4

    sounds to me like you've got a cylinder cutting out. That popping noise is most likely it's last gasp before quitting. Check spark first, but you'll probably be attacking the carbs in short order.

  4. #4
    Seaman Apprentice
    Join Date
    May 2008
    Location
    Florence, SC
    Posts
    34

    Default Re: 76 85 HP Johnson Javelin V4

    Sounds like carb issues. They might need to be taken apart again and rebuilt.

  5. #5
    Chief Petty Officer
    Join Date
    Nov 2007
    Location
    Keystone Heights FL.
    Posts
    542

    Default Re: 76 85 HP Johnson Javelin V4

    MY 73 85hp was doing the same thing, turned out to be a weak coil, I replaced all 4 at the same time and no more problems, thatis after I went through the carbs three times and was about to attack the reed valves before someone here convinced me it was in the ignition system.

    Pull your sparkplug wires and look for rust on the boot connection, they are very bad for corrosion under the spark plug boot, causes high resistance and misfire or "POP" sound.

  6. #6

    Default Re: 76 85 HP Johnson Javelin V4

    I'd start by looking at the engine yourself or find someone else to look at it. Being a '76, it's possible the dealer really wants to sell you a late model used or new OB he has. I had it happen to me. Find another service place. If your not into doing your own stuff, an independent mechanic who services first, then may sell used OBs secondly.. Ask your boating friends for a reccomendation.

    I'd do the carbs to rule them out, and you'll know for sure they were rebuilt. I had a cylinder missing because it was being flooded with gas. The plug was carbon black. It happened to be the lowest compression cylinder too. Dealer Mech said I should look for new power.
    I rebuilt the carbs, cylinder came in, & engine purrs.. Good Luck
    '76 Grady White Sprint 173D
    '88 88SLP

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