Question about Seloc Service Manual - Mercury Outboards - 1-2 Cyl - 1965-89

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I have a 1984 Mercury 9.8 outboard and it runs fine on idle but when you go to full throttle it goes for a couple of minutes then starts to lose power dramatically until in konks out. It will restart but then won't idle. Any suggestions would be appreciated. Also is there any place you know of to get the service manual online for free

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Sounds like a simple fuel starvation. Simplest first- did you open the tank vent? Are you able to pump pressure with the primer when it starts to fail and make a difference?l. This would indicate a fuel pump problem or clogged filter. Then take a flashlight and look into the gas tank for water or **** floating round which might plug up the intake.

Harder stuff might be stuff floating round the carb bowl that gets sucked into a jet. I have seen a coil act this way when hot an shaken.

should always give it a compression test.

Posted on May 26, 2011

  • PG Nilsson
    PG Nilsson Jun 17, 2014

    Thnak you for the advice it could be fuel starvation. I changed the fule hose including the black rubber pump (for fuel) and added carburator cleaner to the fuel as it could be resin ing the carburator. the boat has been stored 8 months on the hard in a cold climate with gasoline in the tank. ump

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